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bjhurley
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Re: Contax G Best Digital Option in 2023


AndereObjektiv wrote:
I would think you might get decent performance on the APS-C sensors with some wider lenses too, although with a 1.5 or 1.6 view angle crop.


The 28mm Biogon is supposed to be fantastic on APS-C (equivalent to roughly 40mm in fullframe terms), so if I wanted to shoot it on digital that's the route I'd go. For full-frame you can add a reversed front-end Plano-Convex (PCX) filter, which improves things dramatically as described in Sebboh's review below:

https://phillipreeve.net/blog/review-carl-zeiss-28mm-f-2-8-biogon-t-1-5m-pcx-filter/

Note that Sebboh was planning to write a follow-on article explaining why he thinks a Sony APS-C camera with this lens is better than an RX-1, but he never got around to it. Apart from the great IQ, that would be a very portable and even pocketable combination, which is what attracts me to it. Although the new Voigtlander 28/2.8 Color-Skopar might be a contender and even smaller.

For use on full-frame cameras the PCX filter does not involve modifying your lens; it is a front-end filter. I don't think they are sold with threads on them, so you have to buy a step-up ring and a step-down ring and sandwich the filter between them (described here: https://phillipreeve.net/blog/rangefinder-wide-angle-lenses-on-a7-cameras-problems-and-solutions/).

Fred also tested this lens on full-frame Sony with the reversed 1.5 PCX filter here: https://www.fredmiranda.com/forum/topic/1453834/33#13892893

As noted above, the 45 and especially the 90mm lenses should be fine on full-frame, no filters needed.



Nov 05, 2023 at 04:04 AM





  Previous versions of bjhurley's message #16383890 « Contax G Best Digital Option in 2023 »