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mmmCCC
Joined: 03 May 2020
Posts: 23
Location: Slovensko
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 Posted: Sun Jun 28, 2020 8:29 am Post subject: Is this aperture ok? |
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mmmCCC wrote:
Hi, can you tell if this aperture blades are on their correct position? This is only photos I have.
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Pancolart
Joined: 04 Feb 2008
Posts: 3702
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Sun Jun 28, 2020 8:40 am Post subject: |
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Pancolart wrote:
Darn, i wish i could see something in those photos...
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Pancolart
Joined: 04 Feb 2008
Posts: 3702
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Sun Jun 28, 2020 8:47 am Post subject: |
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Pancolart wrote:
To add: one of few lenses i have never seen with aperture problem. And i've seen at least 50 samples of it.
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DConvert
Joined: 12 Jun 2010
Posts: 921
Location: Essex UK
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| Posted: Sun Jun 28, 2020 8:55 am Post subject: |
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DConvert wrote:
Those photos show so little of the aperture that I don't think any assessment is possible. In any event problems with apertures are frequently more a case of them sticking, so that they don't close down to the set size when taking a shot. A still image can never indicate that. |
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Pancolart
Joined: 04 Feb 2008
Posts: 3702
Location: Slovenia, EU
Expire: 2013-11-18
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| Posted: Sun Jun 28, 2020 9:00 am Post subject: |
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Pancolart wrote:
| DConvert wrote: |
| In any event problems with apertures are frequently more a case of them sticking... |
Only possible if OP lens is Auto model. If thin Tessar variant faults are quite rare.
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D1N0
Joined: 07 Aug 2012
Posts: 2530
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| Posted: Sun Jun 28, 2020 9:00 am Post subject: |
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D1N0 wrote:
The coatings look fine. Can't tell anything about aperture
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DConvert
Joined: 12 Jun 2010
Posts: 921
Location: Essex UK
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| Posted: Sun Jun 28, 2020 11:22 am Post subject: |
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DConvert wrote:
| Pancolart wrote: |
| DConvert wrote: |
| In any event problems with apertures are frequently more a case of them sticking... |
Only possible if OP lens is Auto model. If thin Tessar variant faults are quite rare. |
Yes that's usually only auto models but I've seen preset apertures with the same issue (sometimes just a couple of blades sticking).
I have a Carl Zeiss Tessar with a completely seized aperture so it's not nearly rare enough for me. (FWIW I've only studies 2 examples of the Zeiss 50/2.8 Tessar) |
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visualopsins
Joined: 05 Mar 2009
Posts: 10959
Location: California
Expire: 2025-04-11
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| Posted: Sun Jun 28, 2020 11:50 am Post subject: |
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visualopsins wrote:
Looks wide open showing view from mirror of up through pentaprism out viewfinder...see the microprisms on focus screen?
Aperture is wide open; looks very clear to me. The diaphragm is not visible.
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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-A 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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