which one for 35mm fov?

[back alley]

21mm lens = 32mm fov
25mm lens = 38mm fov

which do you use for a 35mm substitute?

 

[monochromejrnl]

24mm would be to closest equivalent on an APS-C sensor.

 

[Rob-F]

I don't have an R-D1, but for my D-300, which has the same crop factor, I use a 24mm to get a 35mm FOV. If I were using an R-D1, I think I might use my 25mm CV, because then I could use my 35mm CV aux finder to get (I am inclined to think) a good match between the finder and the image on the sensor. The 21mm might include too much and waste some of the sensor area that would have to be cropped out, at least in cases where I wanted accurate framing.

 

[pb908]

21mm cv !! Just set the hyperfocal @f8, iso800, BW, AE+0.7 ev, and you are ready to go street shooting!

 

[LCT]

...which do you use for a 35mm substitute?

21 & 24 still behave like extra wides so my natural substitute is 28 with the R-D1.

 

[kermaier]

For me the FOV is maybe secondary to the perspective of the lens. 21mm gives too much of the wide-angle stretching of perspective to really substitute for a 35mm full frame lens. Even 25mm is too "wide", though I really love the Canon 25/3.5 on the R-D1. I think the best bet is just using an actual 35mm and backing up, or at most a 28mm.

::Ari

 

[Ronchnam]

which one for 35mm fov

which one for 35mm fov

For me the FOV is maybe secondary to the perspective of the lens. 21mm gives too much of the wide-angle stretching of perspective to really substitute for a 35mm full frame lens. Even 25mm is too "wide", though I really love the Canon 25/3.5 on the R-D1. I think the best bet is just using an actual 35mm and backing up, or at most a 28mm.

::Ari

I agree with that. A 35 is a 35 whatever the camera. And at most a 28 indeed, 28 dof and 40 field.

 

[Lss]

which do you use for a 35mm substitute?

Nothing. I like the 35mm equivalent fov, but R-D1 is not that well suited for it. I would use either a 25 or a 28 (which is a bit too long for 35mm), but so far I have not been able to purchase one. I use a 35 on film a lot and would really like to add a 28 for R-D1/M8. The big problem is that I really want the Summicron.

 

[pvdhaar]

This really depends on where you're coming from.. If most of your experience has been with 35mm format, the 25 is just fine. A 35mm format frame is 36mm wide, corresponding roughly to the focal length of the 35mm lens. By the same reasoning, a 25 suits an APS-C sensor, which is ca. 24mm wide, fine..

But if you've shot a lot with 6x6, a normal like an 80 feels already wider than a normal 50 on 35mm format. And a 65 (often cited as a 35mm equivalent) is not already as wide as the frame is wide; it's also as wide as the frame is high! To get the same feel on APS-C, you'd best select a lens that's as wide as the shorter side of the sensor, which typically is in the order of 20mm.. So for a 6x6 shooter, a 21mm on APS-C will 'feel the same' as a 35mm on 35mm format.

For me, the 25 on the NEX doesn't feel really right and I shoot with either the 16 or the 35. In contrast, the 20 on the D90 (30mm equiv) is just marvelous.. not too wide, not too long.