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h1psta
Joined: 09 Aug 2023
Posts: 2
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 Posted: Wed Aug 09, 2023 5:18 pm Post subject: Is this haze, separation or fungus? Pentax 110 70mm |
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h1psta wrote:
My Pentax 110 70mm works pretty well, although it does bloom on intense highlights. Not sure if that is because of this damage or the lens coatings are simply not that good to begin with.
Anyhow, I noticed this strangely regular pattern on the rear element, which is reported to be a cemented doublet (the only available diagram online suggests otherwise but a user who opened the lens for cleaning claims it's a doublet). From my understanding this is probably not fungus as it is too regular. What could it be?
Image link: http://forum.mflenses.com/userpix/20238/big_12458_1wm3ofprj3hb1_1.jpg |
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calvin83
Joined: 12 Apr 2009
Posts: 7553
Location: Hong Kong
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| Posted: Wed Aug 09, 2023 5:46 pm Post subject: Re: Is this haze, separation or fungus? Pentax 110 70mm |
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calvin83 wrote:
| h1psta wrote: |
My Pentax 110 70mm works pretty well, although it does bloom on intense highlights. Not sure if that is because of this damage or the lens coatings are simply not that good to begin with.
Anyhow, I noticed this strangely regular pattern on the rear element, which is reported to be a cemented doublet (the only available diagram online suggests otherwise but a user who opened the lens for cleaning claims it's a doublet). From my understanding this is probably not fungus as it is too regular. What could it be?
Image link: http://forum.mflenses.com/userpix/20238/big_12458_1wm3ofprj3hb1_1.jpg |
There is no cemented doublet on the rear.
https://www.pentaxforums.com/lensreviews/PENTAX-110-70mm-F2.8.html
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h1psta
Joined: 09 Aug 2023
Posts: 2
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| Posted: Wed Aug 09, 2023 6:46 pm Post subject: |
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h1psta wrote:
I am aware of that diagram, but this guy opened it and claims that it is a doublet.. I am also not sure where the diagram on Pentax forums came from, no other reference can be found http://photographeronbudget.blogspot.com/2013/12/cleaning-rear-element-on-pentax-110.html |
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visualopsins
Joined: 05 Mar 2009
Posts: 10580
Location: California
Expire: 2025-04-11
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| Posted: Wed Aug 09, 2023 6:53 pm Post subject: |
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visualopsins wrote:
Welcome h1psta
Looks like fungus to me. Should be easy to clean. Remove the rear element. Wash using pure soap & water.
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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 (151B), 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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calvin83
Joined: 12 Apr 2009
Posts: 7553
Location: Hong Kong
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| Posted: Thu Aug 10, 2023 1:21 pm Post subject: |
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calvin83 wrote:
I can't see a cemented element from the photo or I don't know how to see it. You can check if there is a weak internal reflection on the rear element. A cemented element will have a a weak internal reflection but a single element will not.
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visualopsins
Joined: 05 Mar 2009
Posts: 10580
Location: California
Expire: 2025-04-11
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| Posted: Thu Aug 10, 2023 4:46 pm Post subject: |
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visualopsins wrote:
http://photographeronbudget.blogspot.com/2013/12/cleaning-rear-element-on-pentax-110.html
Looks like a group to me too. Maybe not a group. Shining light should reveal if haze/fungus is on a cemented surface within a group, or on the inner surface of a single element. The latter may be cleanable.
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ 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 (151B), 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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