Steve Spencer Offline Upload & Sell: On
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p.1 #13 · p.1 #13 · Zeiss 35mm f1.4 ZM or Voigtlander 35mm f1.7 Ultron for Landscape with deep DOF for A7rM and A7rII | |
Tariq Gibran wrote:
The higher resolution of the A7r will show any issues to a greater degree than on the A7 so there is a question if it's to be used on an unmodded sensor (which I don't think you are considering). It's likely though that this lens will perform noticeably better on the modded A7x.
You may even want to revisit this thread and, in particular, note this response by SteveDK about the ZM35/1.4:
"I also have the 35mm/1.4 Distagon ZM, which is very good, though less compact by far. I also prefer the C-Biogon 35mm to the Distagon 35mm stopped down to f/8-f/11. Ironically the Distagon is better corrected even at these apertures, but the one under-corrected aberration, Secondary Longitudinal Chromatic Aberration, can stick out like a sore thumb visually, causing cyan-green fringing on objects behind the plane of focus, annoying on tree branches and pine needles, etc. The forte of that lens really is the wider apertures, so I see the C-Biogon and Distagon 35mm ZM lenses as different purpose tools now. The C-Biogon is the better general purpose daylight optic, while the Distagon is better for low light, indoor and cinematic type renderings."
https://www.fredmiranda.com/forum/topic/1393810/0#13255233
In that same thread, Ron (rscheffler) suggests that he finds the new CV 35 1.7 better than the C-Biogon above for across the frame performance so that Voigtlander may be the one to try on a modded Sony.
"I have the C-Biogon, but have not had the chance to use the Summarit. The 35mm I currently use is the new Voigtlander 35/1.7 Ultron.
It might be worth considering. You can buy the black version from Leicashop in Austria for about ~$650 US delivered, so the price is very attractive right off the bat.
Performance-wise, I feel it outperforms the C-Biogon for across frame sharpness and is also 1.5 stops faster, without being terribly larger. It's about the same diameter, but somewhat longer, and as a bonus for you, uses 46mm filters. Already just a couple stops down and it's very sharp across the frame, whereas from earlier tests, I found the C-Biogon needed more stopping down to bring up the edges."
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The one problem with Steve DK's quote is that longitudinal CA (secondary included) decreases exponentially, and I mean that in the mathematical way, as you stop down. No lens has longitudinal CA stopped down to f/8-f/11 to speak of. So I'm not sure what he is referring to. From what I have seen the lens is brilliant stopped down and on a modded camera has a very flat field almost no CA wonderful colours and nice bokeh, but that just may be my taste, YMMV. It doesn't have longitudinal CA stopped down to f/8, however, and that is a fact.
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