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caspert79
Joined: 31 Oct 2010
Posts: 2926
Location: The Netherlands
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 Posted: Fri Apr 28, 2023 8:41 pm Post subject: |
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caspert79 wrote:
| kiddo wrote: |
| Yashica ML 55mm 2.8 macro, thanks to caspert79 review it came for a good price , and nice shape overall (my son's taken away the Nikkor 55macro so it was a good excuse to go for yashica) |
Good choice 😉
Great lens! |
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caspert79
Joined: 31 Oct 2010
Posts: 2926
Location: The Netherlands
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| Posted: Wed May 03, 2023 3:26 pm Post subject: |
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caspert79 wrote:
Bought the Techart LM-EA7 adapter, as I found a good offer. Now I still need a couple of additional adapters to make it work with most of my lenses. |
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visualopsins
Joined: 05 Mar 2009
Posts: 10543
Location: California
Expire: 2025-04-11
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| Posted: Wed May 03, 2023 6:54 pm Post subject: |
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visualopsins wrote:
| caspert79 wrote: |
| Bought the Techart LM-EA7 adapter, as I found a good offer. Now I still need a couple of additional adapters to make it work with most of my lenses. |
  the LM-EA7-config app is no longer available in Google Apps. The latest version I found is available at https://web.archive.org/web/20190927111011/http://techartpro.com/0831-LM-EA7-Config.apk but it doesn't work for later Android versions, ex. Android 6 works, 13 does not.
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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Alun Thomas
Joined: 20 Aug 2018
Posts: 632
Location: New Zealand
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| Posted: Wed May 03, 2023 9:17 pm Post subject: |
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Alun Thomas wrote:
I've has this Isco Tele-Iscaron 180/2.8 for just over a month, and did a little (unsuccessful) surgery on it. When the aperture is closed past 5.6 there is pronounced veiling flare in the image center, most likely from light reflection off aperture blades. I disassembled and painted them matt black, but the paint flaked off with the movement of the blades. I took it apart again, this time breaking a pin off one blade, which had to be reattached. I then used gun blue, well tried to. The particular one I bought had zero (ZERO) effect on the metal colour, and also made them rust slightly. Some rust converter darkened them, only slightly. Unless you have a proven brand I don't think I'd bother with that method again. To lubricate the blades I used graphite, applied by scribbling on the blade with a mechanical pencil. Unfortunately the graphite is a little shiny, which doesn't help. On reassembly the lens seems slightly better, but not much. Perhaps I'll revisit in future.
The aperture housing connects to the helicoid with an internal threaded collar which was loose. This was a convoluted job to fix, the trickiest part was that the mount (in this case Exakta) is held on with a threaded ring, but it unscrews the opposite way to what you may expect.
Apart from this the lens is in good condition. I bought a white paint pen and redid a lot of the lettering on the lens successfully. The Exakta mount is the external type you normally can't find an adapter for. I ended up removing a mount from a busted camera and epoxying it to my EXA-Leica M adapter, which required a bit of filing to get right as the ring was thicker on the replacement mount than the one originally attached. |
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visualopsins
Joined: 05 Mar 2009
Posts: 10543
Location: California
Expire: 2025-04-11
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| Posted: Wed May 03, 2023 9:26 pm Post subject: |
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visualopsins wrote:
https://www.instructables.com/How-to-Blacken-Steel-with-Motor-Oil/
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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kiddo
Joined: 29 Jun 2018
Posts: 1121
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| Posted: Wed May 03, 2023 9:41 pm Post subject: |
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kiddo wrote:
| Alun Thomas wrote: |
I've has this Isco Tele-Iscaron 180/2.8 for just over a month, and did a little (unsuccessful) surgery on it. When the aperture is closed past 5.6 there is pronounced veiling flare in the image center, most likely from light reflection off aperture blades. I disassembled and painted them matt black, but the paint flaked off with the movement of the blades. I took it apart again, this time breaking a pin off one blade, which had to be reattached. I then used gun blue, well tried to. The particular one I bought had zero (ZERO) effect on the metal colour, and also made them rust slightly. Some rust converter darkened them, only slightly. Unless you have a proven brand I don't think I'd bother with that method again. To lubricate the blades I used graphite, applied by scribbling on the blade with a mechanical pencil. Unfortunately the graphite is a little shiny, which doesn't help. On reassembly the lens seems slightly better, but not much. Perhaps I'll revisit in future.
The aperture housing connects to the helicoid with an internal threaded collar which was loose. This was a convoluted job to fix, the trickiest part was that the mount (in this case Exakta) is held on with a threaded ring, but it unscrews the opposite way to what you may expect.
Apart from this the lens is in good condition. I bought a white paint pen and redid a lot of the lettering on the lens successfully. The Exakta mount is the external type you normally can't find an adapter for. I ended up removing a mount from a busted camera and epoxying it to my EXA-Leica M adapter, which required a bit of filing to get right as the ring was thicker on the replacement mount than the one originally attached. |
Wow, impressive lens and repair project. Do you think a permanent marker black ink would work for the blades ?(might be a stupid question lol) |
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Alun Thomas
Joined: 20 Aug 2018
Posts: 632
Location: New Zealand
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| Posted: Wed May 03, 2023 10:27 pm Post subject: |
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Alun Thomas wrote:
| kiddo wrote: |
Wow, impressive lens and repair project. Do you think a permanent marker black ink would work for the blades ?(might be a stupid question lol) |
If only permanent markers came with matt ink. The one I have looks distinctly glossy when used. It would definitely be better than the matt paint I used. I think I laid the paint on a bit thick, then the pins were tight in the locating hole, that's how I broke one.
| visualopsins wrote: |
| https://www.instructables.com/How-to-Blacken-Steel-with-Motor-Oil/ |
That does look pretty dark at the end. Maybe I'll experiment in future. Right now I'm just happy I got it reassembled, and didn't irretrievably ruin anything... |
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Doc Sharptail
Joined: 23 Nov 2020
Posts: 994
Location: Winnipeg Canada
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| Posted: Thu May 04, 2023 5:10 am Post subject: |
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Doc Sharptail wrote:
"Image" branded 80-200mm f 4.5.
I haven't tried sample photos yet- it's some what dusty with a possibly slightly abraded front element, and a slight divot on the rear element.
A quick search shows some of this lens in "Hanimex" and "Soligor" branding.
Interesting to me because of the twin-ring style.
It is a bit large and bulky, but extremely well made.
The six bladed aperture appears to be clean and dry, if not slightly lop-sided on one blade.
There's the brand mark there on the built-in hood.
I'll have to dig out one of the micro's to get proper photo's of the lower ring marks.
Oddly enough, there is no stop or detent for f5.6. It goes from f4.5 straight to f8. Strange, because at aprox. f5.6 between detents, the aperture has an interesting flower petals shape.
Not sure who made it. the coatings were quite well done and show a green cast with a slight purple tinge...
The price was low enough not to bother me. 
-D.S.
_________________
D-810, F2, FTN.
35mm f2 O.C. nikkor
50 f2 H nikkor, 50 f 1.4 AI-s, 135 f3.5 Q,
50 f2 K nikkor 2x, 28-85mm f3.5-4.5 A/I-s, 35-105 3.5-4.5 A/I-s, 200mm f4 Micro A/I, partial list.
"Ain't no half-way" -S.R.V.
"Oh Yeah... Alright" -Paul Simon |
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kiddo
Joined: 29 Jun 2018
Posts: 1121
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| Posted: Thu May 04, 2023 7:28 am Post subject: |
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kiddo wrote:
| Alun Thomas wrote: |
| kiddo wrote: |
Wow, impressive lens and repair project. Do you think a permanent marker black ink would work for the blades ?(might be a stupid question lol) |
If only permanent markers came with matt ink. The one I have looks distinctly glossy when used. It would definitely be better than the matt paint I used. I think I laid the paint on a bit thick, then the pins were tight in the locating hole, that's how I broke one.
| visualopsins wrote: |
| https://www.instructables.com/How-to-Blacken-Steel-with-Motor-Oil/ |
That does look pretty dark at the end. Maybe I'll experiment in future. Right now I'm just happy I got it reassembled, and didn't irretrievably ruin anything... |
I've read the paint markers could deliver matte finish ,but I've never tried em before. |
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sergun
Joined: 01 Jun 2017
Posts: 283
Location: наша раша
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eggplant
Joined: 27 May 2020
Posts: 516
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| Posted: Thu May 04, 2023 6:13 pm Post subject: |
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eggplant wrote:
| Doc Sharptail wrote: |
"Image" branded 80-200mm f 4.5.
I haven't tried sample photos yet- it's some what dusty with a possibly slightly abraded front element, and a slight divot on the rear element.
A quick search shows some of this lens in "Hanimex" and "Soligor" branding.
Interesting to me because of the twin-ring style.
It is a bit large and bulky, but extremely well made.
The six bladed aperture appears to be clean and dry, if not slightly lop-sided on one blade.
There's the brand mark there on the built-in hood.
I'll have to dig out one of the micro's to get proper photo's of the lower ring marks.
Oddly enough, there is no stop or detent for f5.6. It goes from f4.5 straight to f8. Strange, because at aprox. f5.6 between detents, the aperture has an interesting flower petals shape.
Not sure who made it. the coatings were quite well done and show a green cast with a slight purple tinge...
The price was low enough not to bother me.
-D.S. |
Makinon all over, this one is. fonts, text placement, colours etc.
_________________
UK |
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vivaldibow
Joined: 23 Jun 2018
Posts: 837
Expire: 2021-03-09
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| Posted: Thu May 04, 2023 9:05 pm Post subject: |
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vivaldibow wrote:
Super Coligon 85mm f/1.9. Would love to do a comparison with Vivitar 85/1.8 and Accura 85/1.9, both of which are preset. Not sure yet if it is the same lens as Vivitar 85/1.8 preset, though. |
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papasito
Joined: 09 Jan 2015
Posts: 1658
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| Posted: Thu May 04, 2023 10:13 pm Post subject: |
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papasito wrote:
I have added to my collectoon an almost New Meyer Görlitz Oreston 50/1,8.
Very nice lens.
Not the sharpest nor the great contrast, but anything magic in the pics taken with it.
I like it so much. |
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Alun Thomas
Joined: 20 Aug 2018
Posts: 632
Location: New Zealand
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| Posted: Fri May 05, 2023 4:11 am Post subject: |
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Alun Thomas wrote:
| vivaldibow wrote: |
| Super Coligon 85mm f/1.9. Would love to do a comparison with Vivitar 85/1.8 and Accura 85/1.9, both of which are preset. Not sure yet if it is the same lens as Vivitar 85/1.8 preset, though. |
I think the Vivitar is a different computation, the rear element appears to be smaller that that of the Super Coligon. As pictured below, the Super Coligon on the left, the Vivitar on the right.
In this pic, the Vivitar is once again on the right, on the left is a no-badge 85mm F/1.9 which looks to be made by Nissin Sankor, and which I presume to be the same as your Accura.
The Super Coligon is mentioned in the Seymours 1969 newsletter, found here: http://www.ihagee.org/USA/exaktanews769.pdf
In that news letter it mentions 3 versions of the 85/1.9 from the same manufacturer. |
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Doc Sharptail
Joined: 23 Nov 2020
Posts: 994
Location: Winnipeg Canada
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| Posted: Fri May 05, 2023 5:53 am Post subject: |
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Doc Sharptail wrote:
| eggplant wrote: |
| Makinon all over, this one is. fonts, text placement, colours etc. |
Thank you!
I'll get it outside tomorrow in good day light to try a few frames.
-D.S.
_________________
D-810, F2, FTN.
35mm f2 O.C. nikkor
50 f2 H nikkor, 50 f 1.4 AI-s, 135 f3.5 Q,
50 f2 K nikkor 2x, 28-85mm f3.5-4.5 A/I-s, 35-105 3.5-4.5 A/I-s, 200mm f4 Micro A/I, partial list.
"Ain't no half-way" -S.R.V.
"Oh Yeah... Alright" -Paul Simon |
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marcusBMG
Joined: 07 Dec 2012
Posts: 1304
Location: Conwy N Wales
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| Posted: Fri May 05, 2023 5:26 pm Post subject: Viv Series 1 komine 70-210mm |
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marcusBMG wrote:
I already have one but couldn't resist a bid on this - and I was the only bidder! Pretty much LNIB.
btw I wrote the fix for sticky iris in case of need.
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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vivaldibow
Joined: 23 Jun 2018
Posts: 837
Expire: 2021-03-09
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| Posted: Fri May 05, 2023 10:39 pm Post subject: |
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vivaldibow wrote:
| Alun Thomas wrote: |
| vivaldibow wrote: |
| Super Coligon 85mm f/1.9. Would love to do a comparison with Vivitar 85/1.8 and Accura 85/1.9, both of which are preset. Not sure yet if it is the same lens as Vivitar 85/1.8 preset, though. |
I think the Vivitar is a different computation, the rear element appears to be smaller that that of the Super Coligon. As pictured below, the Super Coligon on the left, the Vivitar on the right.
In this pic, the Vivitar is once again on the right, on the left is a no-badge 85mm F/1.9 which looks to be made by Nissin Sankor, and which I presume to be the same as your Accura.
The Super Coligon is mentioned in the Seymours 1969 newsletter, found here: http://www.ihagee.org/USA/exaktanews769.pdf
In that news letter it mentions 3 versions of the 85/1.9 from the same manufacturer. |
Thanks for the information. Interesting and very valuable newsletter. By rare earth element, I am assuming it refers to thorium. Once the lens arrived, I can measure it and see if it is radioactive or not. |
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D1N0
Joined: 07 Aug 2012
Posts: 2495
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| Posted: Sat May 06, 2023 9:54 am Post subject: Re: Viv Series 1 komine 70-210mm |
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D1N0 wrote:
| marcusBMG wrote: |
I already have one but couldn't resist a bid on this - and I was the only bidder! Pretty much LNIB.
btw I wrote the fix for sticky iris in case of need.
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I've cleaned the aperture of mine several times. Initially it works but when I try to use the lens again it seems to have become even sticky-er than before.
_________________
pentaxian |
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eggplant
Joined: 27 May 2020
Posts: 516
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| Posted: Sat May 06, 2023 11:17 am Post subject: Re: Viv Series 1 komine 70-210mm |
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eggplant wrote:
| marcusBMG wrote: |
I already have one but couldn't resist a bid on this - and I was the only bidder! Pretty much LNIB.
btw I wrote the fix for sticky iris in case of need.
|
Wow, how much if you don't mind me asking? I was looking at these (UK) fairly recently, within last few days, maybe an auction I missed.
I saw a 3x boxed auction of the original Series 1 70-210mm f3.5, and two of the later Cosina ones go for £12.50 + £5.00 shipping- was just outbid, but the photos of the elements showed absolutely nothing.
In a 'strange' twist of fate, my Komine copy (same as picture) has an absolutely bone dry aperture, on either sides..
_________________
UK |
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eggplant
Joined: 27 May 2020
Posts: 516
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| Posted: Sat May 06, 2023 11:20 am Post subject: |
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eggplant wrote:
Also - just for the record, because reviews don't seem to mention it(?), does anyone else notice the relatively strong purple fringing on the v3? It's fine, mostly correctable, just wondering if it's typical.
I also wish I had a block diagram of the v4 and onwards, which is a different composition. It's said to be on the boxes of those, but I haven't found a decent listing showing the box sides yet.
_________________
UK |
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pabeu
Joined: 25 Apr 2018
Posts: 55
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| Posted: Sat May 06, 2023 12:22 pm Post subject: |
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pabeu wrote:
Bought two Topcors 58mm 1.4. Payed quite a hefty price for each and the two have problems. 😡😡😡😡
On one of the lenses the aperture is not properly working and the second one has very slight fog in inner lenses (not able to be seen on photos or straight looking).
Guess these are the risks of buying old lenses but would hope sellers on the bay be more honest with their descriptions.
Now looking for shops to have them serviced in Germany. |
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kiddo
Joined: 29 Jun 2018
Posts: 1121
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| Posted: Sat May 06, 2023 1:11 pm Post subject: |
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kiddo wrote:
| pabeu wrote: |
Bought two Topcors 58mm 1.4. Payed quite a hefty price for each and the two have problems. 😡😡😡😡
On one of the lenses the aperture is not properly working and the second one has very slight fog in inner lenses (not able to be seen on photos or straight looking).
Guess these are the risks of buying old lenses but would hope sellers on the bay be more honest with their descriptions.
Now looking for shops to have them serviced in Germany. |
you could return it, i guess . But to be honest, most of the lenses that havent been cla´d recently would have some kind of issues (haze,dust and worse fungus,separation etc). Anyway, what´s the price they are going nowadays, as i don´t trust the price i see in ebay for items that one can see em there for months/years. Sellers standards of perfect is very untrusty in most of the cases, so i guess the only trusty way to buy it totally perfect shape would be from a trusted seller.
Whats wrong with the aperture? i thought these lenses would be some of the most reliable in mechanics- |
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marcusBMG
Joined: 07 Dec 2012
Posts: 1304
Location: Conwy N Wales
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| Posted: Sat May 06, 2023 1:35 pm Post subject: |
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marcusBMG wrote:
@eggplant it was ebay item 115781719502
I am only idly curious about the cosina VS1's, I would pick one up in PKA mount for say a tenner just to satisfy that. I did a tamron vs viv "supertest" a few years ago, and while the kino and tokina vivs were competitive on eg flower pics, good colours etc, on the tests that discriminated like macro and landscape they were short of the best. However I would like to pick up the rare cosina "apo" version.
IMO the v1 kiron and v2 tokina are worse for fringing.
Some of todays pics with the komine, pentax K30, just handheld, ISO 800, middling f's:
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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Phalbert
Joined: 17 May 2009
Posts: 359
Location: Namibia
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| Posted: Sun May 07, 2023 12:15 pm Post subject: |
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Phalbert wrote:
[quote="Alun Thomas"][url=http://forum.mflenses.
Awesome lens. I thought I knew about all the 18cm / 180mm f2.8. But no...🤷♂️
I want it. 😊
_________________
🙋 My wishlist: Titan or Idaho 135/1,8 Nikon Df Nikkor 105/1,8 35/1,4 85/1,4
My dream lenses: Zuiko 180/2 Prototype Zuiko 85/1,4
Zeiss CY: 55/1,2 85/1,2
Astro Berlin 250/2 Canon EF 50/1,0 85/1,2
Nikkor 105/1,4 28/1,4
My stolen stuff: Zuiko 24/2 #106874; Zuiko 35-80/2,8 #102180; Zuiko 35/2 #119168; Zuiko 90/2 macro #102858; Zuiko x1,4 converter #102019; Tamron 17/3,5 #400567; Tamron 400/4 #80407; Soligor 135/2 #17506600 Sigma 28/1,8 #1001124 |
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stevemark
Joined: 29 Apr 2011
Posts: 3754
Location: Switzerland
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| Posted: Sun May 07, 2023 2:26 pm Post subject: |
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stevemark wrote:
| vivaldibow wrote: |
| By rare earth element, I am assuming it refers to thorium. Once the lens arrived, I can measure it and see if it is radioactive or not. |
Thorium is not a rare earth element. They probably refer to lanthanum.
S
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