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Disassembly and repair - TTArtisan 35mm F0.95 lens in Fuji X
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PostPosted: Tue May 23, 2023 9:50 pm    Post subject: Disassembly and repair - TTArtisan 35mm F0.95 lens in Fuji X Reply with quote
Short article on disassembly and repair - TTArtisan 35mm F0.95 lens in Fuji X

https://www.yukosteel.com/2023/05/disassembly-and-repair-ttartisan-35mm.html





PostPosted: Tue May 23, 2023 10:19 pm    Post subject: Reply with quote
I don't know if going past infinity (if slightly) is a bad thing though. Focusing distances can vary with temperature (I've no idea about this lens in particular though), between hot summer and cold winter days and so. It can also depend on the aperture value and focus shift. I speak generally, without any experience with this lens (I just bought myself an unused X-T20 body to have fun with something new and different from my usual Sony FF combo, so I'm actually having this TTArtisan in mind for the future).


PostPosted: Wed May 24, 2023 12:27 pm    Post subject: Reply with quote
Dejan wrote:
I don't know if going past infinity (if slightly) is a bad thing though. Focusing distances can vary with temperature (I've no idea about this lens in particular though), between hot summer and cold winter days and so. It can also depend on the aperture value and focus shift. I speak generally, without any experience with this lens (I just bought myself an unused X-T20 body to have fun with something new and different from my usual Sony FF combo, so I'm actually having this TTArtisan in mind for the future).


All my adapted lenses focus beyond infinity, which is probably because of the adapter. I have only 1 one dedicated lens for Sony FE, a Voigtlander Color-Skopar 21mm f/3.5, which accurately reaches infinity.


PostPosted: Wed May 24, 2023 12:42 pm    Post subject: Reply with quote
caspert79 wrote:
Dejan wrote:
I don't know if going past infinity (if slightly) is a bad thing though. Focusing distances can vary with temperature (I've no idea about this lens in particular though), between hot summer and cold winter days and so. It can also depend on the aperture value and focus shift. I speak generally, without any experience with this lens (I just bought myself an unused X-T20 body to have fun with something new and different from my usual Sony FF combo, so I'm actually having this TTArtisan in mind for the future).


All my adapted lenses focus beyond infinity, which is probably because of the adapter. I have only 1 one dedicated lens for Sony FE, a Voigtlander Color-Skopar 21mm f/3.5, which accurately reaches infinity.


Lenses focusing beyond infinity is not too problematic for unit-focusing lenses; they can be made to focus, but the focus ring will always exhibit a consistent "error" for all distance markings. Nevertheless, other than the focus scale being just a bit "off", the optical performance of the lens is otherwise not affected.

For lenses with floating focus however, it is a bigger problem. If the lens is focused on infinity (e.g. using live view) by setting the focus grip just slightly short of the infinity marking, the float space will be off for infinity and therefore the lens will not be optimally corrected for any distance setting. Notably corner sharpness can suffer. For lenses with floating focus (and for most zoom lenses for that matter), having the adapter register adjustment spot-on is important.


PostPosted: Wed May 24, 2023 5:27 pm    Post subject: Reply with quote
caspert79 wrote:
Dejan wrote:
I don't know if going past infinity (if slightly) is a bad thing though. Focusing distances can vary with temperature (I've no idea about this lens in particular though), between hot summer and cold winter days and so. It can also depend on the aperture value and focus shift. I speak generally, without any experience with this lens (I just bought myself an unused X-T20 body to have fun with something new and different from my usual Sony FF combo, so I'm actually having this TTArtisan in mind for the future).


All my adapted lenses focus beyond infinity, which is probably because of the adapter. I have only 1 one dedicated lens for Sony FE, a Voigtlander Color-Skopar 21mm f/3.5, which accurately reaches infinity.


my sonnar 135mm 2.8 (c/y) reaches infinity exactly, but is dependent on the termperature outside. Same adapter with other c/y zeiss won´t reach it properly but very close. Some are using one adapter for each lens adjusted properly.
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