Steve Spencer Offline Upload & Sell: On
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p.1 #20 · p.1 #20 · Voigtlander Color-Skopar 21mm f/4.0 P Pancake on A7 | |
sebboh wrote:
first of all, the only person who's posted an actual image here is phillip, and it's a full sized one taken on the a7 so it's easy to judge whether you think that is good enough or not. the rest of the opinions are difficult to attach any kind of context to.
phillip – did you focus that shot at infinity in the center, then stop down and take the picture?
i ask because i've found that optimal performance of most wide angle rangefinder lenses at infinity and f/11 is actually not at infinity focus for most lenses. if you focus to ~3m rather than infinity (wide to ultrawide lenses only) you will typically get better performance across the frame. this is because 1) the exit pupil isn't quite as close to the sensor, 2) it compensates somewhat for the sensor covering induced focus shift, and 3) dof still reaches all the way to infinity.
the sample looks good enough to me to be usable for decent sized prints. focusing a little closer with non-decentered lens might improve performance a bit more.
my price search shows that the cv 21/4, FD 20/2.8, and OM 21/3.5 all are within $50 each other used. the size difference means i would use the cv a lot more than the slr lenses, which i would rarely carry since i don't care much for ultrawide shots. the cv could be in my bag at all times and without me even noticing.
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The size difference between the CVf 21 f/4 and the nFD 20 f/2.8 is quite large. The Oly OM (and several other 21-21 f/3.5-4 SLR lenses including the Pentax M series 20 f/4 and the CV 20 f/3.5 SLII) are about half way in between the size of the two. Here are the specs for these lenses in terms of length (including the relevant adapter) and diameter.
CV 21 f/4 - L 34.8mm D 55mm (weight- 136g plus weight of M to E adapter)
Oly OM 21 f/3.4 - L 59mm D 59mm (weight 180g plus weight of OM to E adapter)
Pentax M 20 f/4 - L 57.5mm D 63mm (weight 150g plus weight of Pentax K to E adapter)
CV 20 f/3.5 SLII - L 59mm D 63mm (weight 205g plus weight of F or EOS to E adapter)
nFD 20 f/2.8 - L 82mm D 76.5mm (weight 315 plus weight of FD to E adapter)
To give some comparisons the CV 21 f/4 with its adapter would be about the size of Nikon 28 f/2.8 E-series lens, or the Fuji X mount 18 f/2, or the Oly m4/3rds 17 f/1.8.
The SLR 20-21 f/3.5-4 each with their own adapter would be about the size of the Nikon 28 f/2 AiS, or the Zeiss CY 28 f/2.8, or the Fuji X mount 14 f/2.8, or the Panny Leica m4/3rds 25 f/1.4, or the Zeiss touit 32 f/1.8
The nfD 20 f/2.8 with its adapter would be about the size of the Nikon 28 f/1.4, the Canon 35 f/1.4, the Zeiss C/Y 100 f/2.8, it would be bigger than the Fuji X mount 56 f/1.2, and about the size of the Oly m4/3rds 12-40 f/2.8 zoom.
So three very different size classes IMO. My own personal preference is that I can deal with the size of something like the Oly OM 21 f/3.5, even with an adapter, not to have to deal with the extra processing demands of fixing colour shift, etc. These are very personal decisions, however. And different people will have very different views of how big is too big and how much extra processing is an annoyance.
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