|
Forum: Pentax News and Rumors
06-20-2016, 05:46 AM
|
| |
Maybe. But it is trotted out multiple times that a 55m on APS-C sucks for portraiture while an 85mm is awesome on full frame. The reality is (assuming the same quality lens) that you'll have a hard time telling them apart.
As to the rest of equivalence, I still find it pretty useless. The widest apertures on full frame lenses (the ones that prove that full frame is better) are pretty useless to me due to lack of depth of field. I like it. It has nice resolution and particularly with pixel shift, you can get pretty awesome images with amazing dynamic range. But a K3 is pretty sweet camera too and more than capable.
|
|
Forum: Pentax News and Rumors
06-20-2016, 04:07 AM
|
| |
You are correct. 30mm f2 and iso 100 and 1/200 second on APS-C should be roughly equivalent to 45mm iso 200 and 1/200 second on full frame. People do tend to leave the iso out of the equation for some reason, but if you don't change it, then you won't get a correctly exposed image on one format or the other.
I guess I am more irritated by the whole "full frame doesn't have perspective distortion because it uses proper focal lengths, but APS-C does." If you use equivalent focal lengths and have similar framing, you really can't tell the difference (except that certain lenses do render differently).
|
|
Forum: Pentax News and Rumors
06-19-2016, 03:05 PM
|
| |
My experience is that if you frame the same and have equivalent apertures, the end result will be pretty similar. This is one comparison I did awhile back, which isn't perfect, but compares 55mm on a K-1 to 31mm on crop camera.
This is the DA *55 on the K-1 at f2.8
 Victoria (DA *55) by Vincent1825, on Flickr
This is the FA 31 on the K3 at f2
 Victoria (FA 31) by Vincent1825, on Flickr
I think you will see more softness at this point on crop camera because you are trying to match settings on the full frame. If I did f2.8 on crop and f4 on full frame, you would have a harder time telling the difference.
I will say that for the majority of images, the extra resolution of the K-1 isn't particularly important and I don't shoot high iso enough to benefit from that. Biggest improvement to me is better dynamic range at given isos. For John Flores question, an f2.8 zoom on a crop camera will probably be softer wide open than an f4 zoom would be on a full frame camera, but that will depend on lens design. Distortion probably depends on lens design, as well, as will chromatic aberration. My FA 77 fringes like crazy equally on the K3 as my K-1, on the other hand, the DFA 24-70 is stellar on both in this respect.
As for the theme of the thread, I would hope for a little different focal length if this lens is as big as is mentioned in the patent. This seems awfully big for what it is.
|
