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Topcor 28mm help!
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PostPosted: Mon Jul 12, 2021 7:58 am    Post subject: Topcor 28mm help! Reply with quote
Hi All
This is a long shot, I am looking for a damaged Topcor RE Auto 28mm 2.8 condition doesn't matter as long as the rear element is usable. My copy was badly damaged prior to it coming to me.
I would be prepared to buy a working copy but the prices are fairly high especially the black versions
Or does anyone have a suggestion as to re-polishing the glass or any suggestions for spare parts I know these are rare but maybe someone knows of a Collector or has contact that could help.

Thanks Andrew


PostPosted: Mon Jul 12, 2021 5:03 pm    Post subject: Reply with quote
Topcors havent held value very well as of late and nice black one can be had for $99 USD thats what the last one went for. I would hit up the fellows who have a best offer on theirs with that number. I would then sell you beater for 40-60......... Cost $70.....

This was a $200-300 lens not too long ago if memory serves.


PostPosted: Mon Jul 12, 2021 6:55 pm    Post subject: Reply with quote
Gatorengineer64 wrote:
Topcors havent held value very well as of late and nice black one can be had for $99 USD thats what the last one went for. ...
This was a $200-300 lens not too long ago if memory serves.


Interesting to hear ... The 2.8/28mm RE Topcor is a rather poor performer, at least compared to the common OEM 2.8/28mm lenses such as Nikkor, Canon nFD, or Minolta MC/MD. While the corners of the Topcor RE 2.8/28mm are surprisingly good, large parts of the field are rather poor. This is quite contrary to the performance of most OEM 2.8/28mm which are good over 85 - 95% of the image field, but have poor corners.

S


PostPosted: Mon Jul 12, 2021 9:19 pm    Post subject: Reply with quote
Gatorengineer64 wrote:
Topcors havent held value very well as of late and nice black one can be had for $99 USD thats what the last one went for. I would hit up the fellows who have a best offer on theirs with that number. I would then sell you beater for 40-60......... Cost $70.....

This was a $200-300 lens not too long ago if memory serves.


Thanks I will have a look. Last time I did they were asking $400 plus


PostPosted: Mon Jul 12, 2021 9:21 pm    Post subject: Reply with quote
stevemark wrote:
Gatorengineer64 wrote:
Topcors havent held value very well as of late and nice black one can be had for $99 USD thats what the last one went for. ...
This was a $200-300 lens not too long ago if memory serves.


Interesting to hear ... The 2.8/28mm RE Topcor is a rather poor performer, at least compared to the common OEM 2.8/28mm lenses such as Nikkor, Canon nFD, or Minolta MC/MD. While the corners of the Topcor RE 2.8/28mm are surprisingly good, large parts of the field are rather poor. This is quite contrary to the performance of most OEM 2.8/28mm which are good over 85 - 95% of the image field, but have poor corners.

S

Good to know, maybe it’s not worth the effort to get it fixed or replaced


PostPosted: Mon Jul 12, 2021 11:13 pm    Post subject: Reply with quote
Gatorengineer64 wrote:
Topcors havent held value very well as of late and nice black one can be had for $99 USD thats what the last one went for.


The one sold for USD 99.-- was a RE 2.8/28mm (new). I was writing about the "classical" RE Topcor 2.8/28mm, not the "new" one. It may well be that the "new" has a better optical performance than the classical, even though the "classical" is much more expensive.

S


PostPosted: Mon Jul 12, 2021 11:27 pm    Post subject: Reply with quote
Here's a few shots and test shots from my black RE 28/2.8( I also have a spare)
https://www.flickr.com/photos/lightshow-photography/tags/topcorre2828/
I find it performance to be as good as most lenses of similar specs.


PostPosted: Tue Jul 13, 2021 2:22 am    Post subject: Reply with quote
stevemark wrote:
Gatorengineer64 wrote:
Topcors havent held value very well as of late and nice black one can be had for $99 USD thats what the last one went for.


The one sold for USD 99.-- was a RE 2.8/28mm (new). I was writing about the "classical" RE Topcor 2.8/28mm, not the "new" one. It may well be that the "new" has a better optical performance than the classical, even though the "classical" is much more expensive.

S


Good to know . How do you tell the difference between the 2 ??


PostPosted: Tue Jul 13, 2021 2:49 am    Post subject: Reply with quote
adonuff wrote:
stevemark wrote:
Gatorengineer64 wrote:
Topcors havent held value very well as of late and nice black one can be had for $99 USD thats what the last one went for.


The one sold for USD 99.-- was a RE 2.8/28mm (new). I was writing about the "classical" RE Topcor 2.8/28mm, not the "new" one. It may well be that the "new" has a better optical performance than the classical, even though the "classical" is much more expensive.

S


Good to know . How do you tell the difference between the 2 ??

Well, there is the RE Topcor 28/2.8 made by Topcon and another later lens made by Cima.
Topcon https://www.wesellyourcollection.com/topcon/product/12-re-auto-topcor-28mm-128-black-lens-sn-1414287-minty/


Cima https://www.worthpoint.com/worthopedia/serviced-topcon-re-topcor-28mm-f2-1822215911
https://lens-db.com/cima-kogaku-re-topcor-28mm-f28-1974/


PostPosted: Tue Jul 13, 2021 4:53 am    Post subject: Reply with quote
I have the Classic version Serial No.1415155.


PostPosted: Tue Jul 13, 2021 4:56 am    Post subject: Reply with quote
Lightshow wrote:
Here's a few shots and test shots from my black RE 28/2.8( I also have a spare)
https://www.flickr.com/photos/lightshow-photography/tags/topcorre2828/
I find it performance to be as good as most lenses of similar specs.


Do you need 2?
If not how much would you want for the second copy you have?
Posted to Australia.

The pictures look good, better than some of the other 28's I have.


PostPosted: Tue Jul 13, 2021 6:34 am    Post subject: Reply with quote
adonuff wrote:
Lightshow wrote:
Here's a few shots and test shots from my black RE 28/2.8( I also have a spare)
https://www.flickr.com/photos/lightshow-photography/tags/topcorre2828/
I find it performance to be as good as most lenses of similar specs.


Do you need 2?
If not how much would you want for the second copy you have?
Posted to Australia.

The pictures look good, better than some of the other 28's I have.

Do I need 2? No, do I 'need' 1? No, I don't 'need' any lens, but I get why you asked.
I am willing to sell it or even trade it depending on the lens offered, since I can only use one of them at a time, and I only bought it because I was having issues with the first one, so bought a second to compare it to, turns out it was me and not the lens that was causing the issue.
It's in wonderful condition, like new, grip is in VG condition.
$300 USD + shipping.
Or
Contax G 28mm
Or
Super Yashinon-R 135mm Pentamatic mount.
Or
Pentax preset 105mm black
Or
Konica AR 135mm preset

PM if interested.


PostPosted: Tue Jul 13, 2021 6:47 am    Post subject: Reply with quote
Lightshow wrote:
adonuff wrote:
Lightshow wrote:
Here's a few shots and test shots from my black RE 28/2.8( I also have a spare)
https://www.flickr.com/photos/lightshow-photography/tags/topcorre2828/
I find it performance to be as good as most lenses of similar specs.


Do you need 2?
If not how much would you want for the second copy you have?
Posted to Australia.

The pictures look good, better than some of the other 28's I have.

Do I need 2? No, do I 'need' 1? No, I don't 'need' any lens, but I get why you asked.
I am willing to sell it or even trade it depending on the lens offered, since I can only use one of them at a time, and I only bought it because I was having issues with the first one, so bought a second to compare it to, turns out it was me and not the lens that was causing the issue.
It's in wonderful condition, like new.
$300 USD + shipping.
Or
Contax G 28mm
Or
Super Yashinon-R 135mm Pentamatic mount.
Or
Pentax preset 105mm black
Or
Konica AR 135mm preset


What sort of Pentax 105? I have a Takumar 105mm 2.8 Preset with original Hood, it has some small cleaning marks on the front glass but takes good pictures if that's what your looking for?


PostPosted: Tue Jul 13, 2021 7:44 am    Post subject: Reply with quote
Yeah there are not Pentax presets Smile

There are two versions of the Asahi Takumar 1:2.8 / 105 with different optics -- the first which is silver and black (4/4), and the second which is all black (5/4). The Auto-Takumar shares same 4/4 optics as the first preset.

https://takumarguide.weebly.com/1--28-f105-331.html
https://takumarguide.weebly.com/1--28-f105-349.html
https://takumarguide.weebly.com/1--28-f105-340.html

I have both presets. Prefer silver and black for bokeh...


PostPosted: Tue Jul 13, 2021 7:59 am    Post subject: Reply with quote
visualopsins wrote:
Yeah there are not Pentax presets Smile

There are two versions of the Asahi Takumar 1:2.8 / 105 with different optics -- the first which is silver and black (4/4), and the second which is all black (5/4). The Auto-Takumar shares same 4/4 optics as the first preset.

https://takumarguide.weebly.com/1--28-f105-331.html
https://takumarguide.weebly.com/1--28-f105-349.html
https://takumarguide.weebly.com/1--28-f105-340.html

I have both presets. Prefer silver and black for bokeh...


I have the one shown in your second link, are they rare? mine has a few cleaning marks but the pics are still very good.


PostPosted: Tue Jul 13, 2021 8:15 am    Post subject: Reply with quote
adonuff wrote:
visualopsins wrote:
Yeah there are not Pentax presets Smile

There are two versions of the Asahi Takumar 1:2.8 / 105 with different optics -- the first which is silver and black (4/4), and the second which is all black (5/4). The Auto-Takumar shares same 4/4 optics as the first preset.

https://takumarguide.weebly.com/1--28-f105-331.html
https://takumarguide.weebly.com/1--28-f105-349.html
https://takumarguide.weebly.com/1--28-f105-340.html

I have both presets. Prefer silver and black for bokeh...


I have the one shown in your second link, are they rare? mine has a few cleaning marks but the pics are still very good.


Not rare according to my definition. Smile

I paid $70 recently...$99 for first version.


PostPosted: Tue Jul 13, 2021 9:44 am    Post subject: Reply with quote
They were always Pentax, they just didn't know it yet. Welcome Turtle


PostPosted: Wed Jul 14, 2021 6:00 pm    Post subject: Reply with quote
stevemark wrote:
Gatorengineer64 wrote:
Topcors havent held value very well as of late and nice black one can be had for $99 USD thats what the last one went for. ...
This was a $200-300 lens not too long ago if memory serves.


Interesting to hear ... The 2.8/28mm RE Topcor is a rather poor performer, at least compared to the common OEM 2.8/28mm lenses such as Nikkor, Canon nFD, or Minolta MC/MD. While the corners of the Topcor RE 2.8/28mm are surprisingly good, large parts of the field are rather poor. This is quite contrary to the performance of most OEM 2.8/28mm which are good over 85 - 95% of the image field, but have poor corners.

S


This sounds like field curvature. Have you tested the lens for field curvature?


PostPosted: Thu Jul 15, 2021 12:40 am    Post subject: Reply with quote
Gatorengineer64 wrote:
Topcors havent held value very well as of late and nice black one can be had for $99 USD thats what the last one went for. I would hit up the fellows who have a best offer on theirs with that number. I would then sell you beater for 40-60......... Cost $70.....

This was a $200-300 lens not too long ago if memory serves.

This $99 lens? https://www.ebay.com/itm/203353941734
It was not made by Topcon, it was made by Cima, the serial gives it away (701xxxx), collectors are not really interested in it, so it sells for 1/3rd the real one sells for.
The RE 28mm made by Topcon has a serial starting with 141xxxx and have sold for $275 - $300 recently, there are copies asking for $400.
Early versions have a chrome filter ring, the later versions have an anodized filter ring. I think the switch happened around 1413000(I haven't done an exhaustive search).
Production is about 7000 lenses, Topcon Story lists 1416137 as the highest serial they serviced.
Lens construction is 7 elements in 7 groups.
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