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inglis wrote:
Does anyone find issues with front focusing lenses on the Techart Pro?
For example zooms like the front part of the Contax CY 35-70 extends when frocusing away from the glass in the back.
Does use of a front focusing lens on the Techart Pro degrade imagery?
The Techart Pro is optimally designed to work with unit focusing lenses. It doesn't work as well with floating focus lenses but there is a technique to use to improve the performance. This is covered in the Techart Pro website...
http://techartpro.com/faq/
Q: How does the focusing work and what is the difference versus focusing via the turning the focusing ring?
A: The focusing is done by adjusting the distance between the lens and focal plane (sensor). There is no difference in terms of image quality for unit focusing lenses.
Q: Will the image quality change when focusing with Techart PRO compared to MF adapter?
A: For unit focusing lens, the image quality will be the same as turning the focusing ring to focus on Sony A7 series cameras. For floating elements design, image quality may be changed. (FYI, Most of the Leica M lenses are unit focusing).
http://techartpro.com/
Kerry
February 13, 2016 at 2:55 am Reply
For lenses with a floating element, is it best to coarse focus manually, and have the adapter fine focus?
Admin
February 13, 2016 at 12:13 pm Reply
Yes you are correct. So that the performance of the image will not be affected.
caddy
February 15, 2016 at 3:35 pm Reply
And what with internal / rear focusing lenses?
Admin
February 15, 2016 at 4:00 pm Reply
Internal focusing lenses are designed to improve the close focusing ability of the lens. In order to have the best close up performance, suggest to coarse adjust the focusing ring and use Techart PRO for fine focus adjustment.
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