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FlexiPack
Joined: 09 Jul 2008
Posts: 9
Location: Manchester, UK
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 Posted: Tue Sep 10, 2024 2:46 pm Post subject: Is this Canon nFD 24mm f/2.8 decentred? |
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FlexiPack wrote:
Just got the lens off ebay, and it's noticeably soft on the left side when compared to the right. Is this common for the lens or is it a bad copy?
I've done a brick wall test but it's noticeable in real world photos too.
Top left vs Top right:
Whole photo:
P.S is there a way to upload full size photos? |
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BrianSVP
Joined: 09 Jun 2023
Posts: 354
Location: Philadelphia
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| Posted: Tue Sep 10, 2024 2:49 pm Post subject: Re: Is this Canon nFD 24mm f/2.8 decentred? |
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BrianSVP wrote:
Hard to tell.
Your photo doesn't seem to have been taken perpendicular to the wall. Notice how the bottom course of bricks appears parallel to the frame, but the top doesn't?
| FlexiPack wrote: |
Just got the lens off ebay, and it's noticeably soft on the left side when compared to the right. Is this common for the lens or is it a bad copy?
I've done a brick wall test but it's noticeable in real world photos too.
Top left vs Top right:
Whole photo:
P.S is there a way to upload full size photos? |
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FlexiPack
Joined: 09 Jul 2008
Posts: 9
Location: Manchester, UK
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| Posted: Tue Sep 10, 2024 3:00 pm Post subject: Re: Is this Canon nFD 24mm f/2.8 decentred? |
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FlexiPack wrote:
| BrianSVP wrote: |
Hard to tell.
Your photo doesn't seem to have been taken perpendicular to the wall. Notice how the bottom course of bricks appears parallel to the frame, but the top doesn't?
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It is slightly off but I took multiple photos, even with focusing on the left side to make sure it wasn't offset. Another, slightly more level one below. It's the same with regards to the softness.
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visualopsins
Joined: 05 Mar 2009
Posts: 11061
Location: California
Expire: 2025-04-11
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| Posted: Tue Sep 10, 2024 4:24 pm Post subject: |
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visualopsins wrote:
Or the adapter is not flat left-to-right?
Full size photos need to be uploaded elsewhere with link posted here.
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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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FlexiPack
Joined: 09 Jul 2008
Posts: 9
Location: Manchester, UK
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| Posted: Tue Sep 10, 2024 4:57 pm Post subject: |
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FlexiPack wrote:
| visualopsins wrote: |
Or the adapter is not flat left-to-right?
Full size photos need to be uploaded elsewhere with link posted here. |
I tested my 50mm with the same adapter and that's fine, so it's not an adapter issue. I would have preferred that be the case though. |
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caspert79
Joined: 31 Oct 2010
Posts: 3225
Location: The Netherlands
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| Posted: Tue Sep 10, 2024 5:30 pm Post subject: |
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caspert79 wrote:
Take a picture @ infinity, then it’s easier to see. |
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Ultrapix
Joined: 06 Jan 2012
Posts: 576
Location: Italy
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| Posted: Tue Sep 10, 2024 8:14 pm Post subject: |
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Ultrapix wrote:
Does your lens have any play? if yes it could be the well known nFD bushes issue |
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