p.41 #3 · Sony A7 and A7r Full Frame with Canon Lenses
Pretty darn close. I wonder if the Pentax's lower DoF is why the fabric looks a tad softer, as the bottle ;abel is showing a bit more detail than the Sony, but the fabric is clearly sharper.
p.41 #4 · Sony A7 and A7r Full Frame with Canon Lenses
Pixel Perfect wrote:
Pretty darn close. I wonder if the Pentax's lower DoF is why the fabric looks a tad softer, as the bottle ;abel is showing a bit more detail than the Sony, but the fabric is clearly sharper.
It could be part of it. Also could partly be more in-camera jpg sharpening on the Sony. Either way, pretty darn impressive.
p.41 #6 · Sony A7 and A7r Full Frame with Canon Lenses
Again, it is a different tool ... One mini MF that nothing out there can replace it for its prize tag. Combine this one with what you have then you won't miss anything
p.41 #8 · Sony A7 and A7r Full Frame with Canon Lenses
Sure there are some factors to consider when comparing images from imaging-resource.com
Aside from the obvious jpg processing (we have to wait for camera support with our favorite RAW converters), the DOF and aspect ratio play some tricks here.
The Pentax image is clearly DOF limited, as seen in the small basket detail beneath the fabric. This is expected since f/8 is used with both formats. I would find such comparisons much more useful if they were using DOF equivalents.
Focus is also off sometimes at iamging-resource.com.
The aspect ratio of the 645D is 4:3, and imaging-resource has chosen a FOV that favors 4:3 over 3:2 for detail, by just cropping out the sides. What is worse in this case, is that the 645D image has a narrower FOV even in the vertical direction. This gives the impression of the 645D resolving more detail than it actually does.
Regarding glass, we should be concerned mostly towards the edges. At f/8 the lenses used are diffraction limited in the central region.
Nevertheless, none of these factors can take away from the A7r that it delivers medium format quality.
p.41 #10 · Sony A7 and A7r Full Frame with Canon Lenses
Pixel Perfect wrote:
It's pretty simple math. Ultimately we'd like to be able to print at 300dpi. ...........
Fundamentally, this is the reason. For many people detailed prints are increasingly satisfying up to 300 dpi. It doesn't matter if it's a great print at 240 dpi. There's increasingly utility to many photographers up to maximum perceivable resolution for some types of prints. Phase One wouldn't be in business if people only bought cameras out of commercial necessity.
p.41 #11 · Sony A7 and A7r Full Frame with Canon Lenses
This dutch site tested the A7R with the 24mm TS-E fully shifted (although the image is showing the camera with the 17mm TS-E)
From the crops, sharpness looks great with the usual vignetting we get when shifting the lens to the extreme.
The Metabones Mark III adapter was used.
From the article:
"The Alpha 7R has no problem with the Canon 24mm and 17mm TSE. The image remains sharp right into the corners and vignetting is the same as the EOS 5D a little at full adjustment."
p.41 #12 · Sony A7 and A7r Full Frame with Canon Lenses
Fred Miranda wrote:
This dutch site tested the A7R with the 24mm TS-E fully shifted (although the image is showing the camera with the 17mm TS-E)
From the crops, sharpness looks great with the usual vignetting we get when shifting the lens to the extreme.
The Metabones Mark III adapter was used.
From the article:
"The Alpha 7R has no problem with the Canon 24mm and 17mm TSE. The image remains sharp right into the corners and vignetting is the same as the EOS 5D a little at full adjustment."
Wow that sounds pretty awesome. Interesting that they found it pretty sharp even at the edges (where say a D800 with 24-70 DG gets sort of squishy already at 36MP FF density) so the recent Canon glass was designed for these higher MP cams.
p.41 #13 · Sony A7 and A7r Full Frame with Canon Lenses
Pixel Perfect wrote:
It's pretty simple math. Ultimately we'd like to be able to print at 300dpi. Let's say you make a 30 x 20" print, you are going to need 9000 x 6000 or 54MP. So even the A7R won't get us there. Hence we are looking at native 24 x 16" @ 300dpi from 36MP, which is what my Epson 3880 A2 printer can do. Of course we can interpolate and the stretch from 24 x 16 to 30 x 20 is not that much for the A7R but would be much tougher for the 5D III.
I tried some test prints and could notice improvements moving up from 180ppi all the way to 720, although I think 540 was the reasonably practical limit to notice the difference between that and 720 I had to realllllly stare carefully from as close as I could force myself to focus so that's taking it too far. I'm not sure if 540 was the magic limit, I didn't test too much between so maybe 450 or something would be just about as good, not sure. But 180 vs 540 was HUGE and even 300 vs 540 was quite noticeable. 360 vs 540 too.
Also don't forget that sometimes you end up cropping later, sometimes a decent bit and often you crop to a different shape sometimes far from 3:2 and then lose a lot of res in one dimension (along you'd need to roll print to make the most of it if you had it).
And, although the A7R won't be great for this scenario, this is the whole reach thing and 36MP FF isn't even close to what you'd ideally want for wildlife reach, so bring 36MP on with ease.
p.41 #15 · Sony A7 and A7r Full Frame with Canon Lenses
skibum5 wrote:
I tried some test prints and could notice improvements moving up from 180ppi all the way to 720, although I think 540 was the reasonably practical limit to notice the difference between that and 720 I had to realllllly stare carefully from as close as I could force myself to focus so that's taking it too far. I'm not sure if 540 was the magic limit, I didn't test too much between so maybe 450 or something would be just about as good, not sure. But 180 vs 540 was HUGE and even 300 vs 540 was quite noticeable. 360 vs 540 too.
Also don't forget that sometimes you end up cropping later, sometimes a decent bit and often you crop to a different shape sometimes far from 3:2 and then lose a lot of res in one dimension (along you'd need to roll print to make the most of it if you had it).
And, although the A7R won't be great for this scenario, this is the whole reach thing and 36MP FF isn't even close to what you'd ideally want for wildlife reach, so bring 36MP on with ease....Show more →
I've read extensive tests showing little to be gained from going beyond 300/360dpi. Sure there were some improvements at 600dpi under the loupe, but for the extra ink and massively slower print times, for 99.9% of us it's not worth it IMO. As the owner of an A2+ printer, being able to do 25 x 17 at 300dpi is plenty good enough.
p.41 #16 · Sony A7 and A7r Full Frame with Canon Lenses
Pixel Perfect wrote:
I've read extensive tests showing little to be gained from going beyond 300/360dpi. Sure there were some improvements at 600dpi under the loupe, but for the extra ink and massively slower print times, for 99.9% of us it's not worth it IMO. As the owner of an A2+ printer, being able to do 25 x 17 at 300dpi is plenty good enough.
I concur with Pixel here. I have a couple of large format HP printers and I've done the test making large prints at various dpi values and for the HP, I see no need to go past 300 dpi.
p.41 #17 · Sony A7 and A7r Full Frame with Canon Lenses
Pixel Perfect wrote:
I've read extensive tests showing little to be gained from going beyond 300/360dpi. Sure there were some improvements at 600dpi under the loupe, but for the extra ink and massively slower print times, for 99.9% of us it's not worth it IMO. As the owner of an A2+ printer, being able to do 25 x 17 at 300dpi is plenty good enough.
360 certainly looks pretty good and I wouldn't complain about it, but I do see an extra something, a completely detailed, naturally smooth, reality type look going to 540 so I definitely prefer that if I can get it, it's not crucial or anything by any means though.
p.41 #18 · Sony A7 and A7r Full Frame with Canon Lenses
skibum5 wrote:
360 certainly looks pretty good and I wouldn't complain about it, but I do see an extra something, a completely detailed, naturally smooth, reality type look going to 540 so I definitely prefer that if I can get it, it's not crucial or anything by any means though.
Well we are going to need 124MP cameras to even print 25 x 17 @ 540dpi. maybe in 5 years our pcs and storage could handle that easily. For now I'll settle for 36MP or maybe even a little more if Canon pulls its finger out.
p.41 #19 · Sony A7 and A7r Full Frame with Canon Lenses
Pixel Perfect wrote:
Well we are going to need 124MP cameras to even print 25 x 17 @ 540dpi. maybe in 5 years our pcs and storage could handle that easily. For now I'll settle for 36MP or maybe even a little more if Canon pulls its finger out.
My printer only does 19x13MP so I'm luckier than those stuck with larger printers I just need to wait for my 72MP camera .
