I was wondering what you like about this lens versus the CV 21 or 28mm? I've never used a 25mm lens, as it always seemed too close to a 28 and a 21. What makes the 25 so special, in your opinion? I'm curious as to what distinguishes the 25 from those other two lenses.
It really is THAT 25mm rather than the 25mm focal length in general. Over the past seven years I've learned that it's really not the focal length that has me liking a lens, but it's the glass, speed, sharpness, how it paints, contrast.
I grew up on a Nikkor 24/2.8 and liked it but never loved it. Too much distortion but always wide enough. Sharp, fast to focus, great lens other than it made heads into footballs way too often.
I had a Leica 21/2.8 some years back and did not like it. 21 just felt too wide or not wide enough. Made heads even more like football than my old 24. It was the wide part of my 21/35/90 Leica triad of lenses. Rarely came out to see the light. It wasn't the external finder issue as I used them years before and was quite happy with my pick of a Bessa T over an R2 more recently.
While I have two 28mms that I love (Nikkor 28/2.8 AIs, the 28/1.9 equivalent on my GRD III) I never went that way on any of my range finders or SLRs. 35 as always been my anchor lens in RF and I could not afford much glass in High School.
Going from 35 or 40 to 28 to me seems silly, too close to each other, I can just move. Lots of Nikons were used with a 24/50/105 setup for years. I try to go a little further between lenses. The RF kit that allowed me to get most of I wanted was a 15/25/40/105 combo. After learning to love the Nikkor 50/1.4 Millennium I could have swapped that out for my 40.
The CV 25/4 is a wonderful lens, very low distortion, quick to adjust and sharp. I had no worries about taking people pictures with it and ending up with funny shaped heads. It was not as fast as I would have liked, but it was so small I worked around it. Finding chairs and walls to use for slow shutter speeds.
I kind of design systems around what I call "Anchor Lenses", a lens that you absolutely love. I stumbled onto the 25/4, got it with a used 15/25/Bessa L combo as I wanted the L and the 15 basically for free. I had suspected I would sell it off (previous experience with the 24) but found I loved it. After that I designed many of my systems around the 25 as the anchor, even though it spent 96% of it's life on a Bessa L, the click stops, the painting, it was just perfect for me at that time.
Hope this helps.
B2 (;->