p.135 #1 · Official: Sony A7 and A7R Fullframe Mirrorless
Fred Miranda wrote:
The SEL1018 samples do not look good at all but to be fair, this lens was not optimized for full frame.
My experience so far is with adapted TS-E Canon lenses like the 17mm and 24mm. What I'm getting at the corners is an effect that resembles 'diffraction'.
In that case, the explanation of glass thickness in front of the sensor makes a lot of sense.
p.135 #4 · Official: Sony A7 and A7R Fullframe Mirrorless
I'd be surprised uhoh, most all Contax lenses are optimised for infinity, but of course never say never. Do you think UV/haze plays a part over longer distances WRT the sensor toppings? With a UWA it might - you would need to look at the respective distances to each object in the image. Actually DoF and exact focal plane data are much harder to assess close up - even for a 21mm lens. One this good anyway.
What I see in the 35mm Canon you posted is a steady drop off from IC outwards...do you have a reliable MTF chart for it? I can tell you the percentage drop-off I would expect for all my lenses based on these data. I also use a Sony adapter, not an aftermarket part.
We need to look at all factors, obviously. Except Max of course.
PS Fred's image at the link did not look like it was a mile away, unless he was shooting a very large house indeed.
Is this the Contax G-Biogon 21mm f/2.8? I've tried mine (Leica M conversion by MS-Optical on Novoflex M<>FE adapter) on my A7r, and it is just plain horrible in anything not in the center of the frame. Looks like a holga, really even stopped down to f/11. But my tests were done at infinity, hence my question about your lens
And I'm not even talking about the red/magenta edges, but Cornerfix could fix that. It's the smearing that is actually horrible, or should I say blurring I had used it with success on my Leica M9, it was sharp in the corners, and I only had to correct the edges for color shifts, but on the Sony A7r, the edges are just... plain blurry.
p.135 #6 · Official: Sony A7 and A7R Fullframe Mirrorless
beetlephoto wrote:
Hi,
Is this the Contax G-Biogon 21mm f/2.8? I've tried mine (Leica M conversion by MS-Optical on Novoflex M<>FE adapter) on my A7r, and it is just plain horrible in anything not in the center of the frame. Looks like a holga, really even stopped down to f/11. But my tests were done at infinity, hence my question about your lens
And I'm not even talking about the red/magenta edges, but Cornerfix could fix that. It's the smearing that is actually horrible, or should I say blurring I had used it with success on my Leica M9, it was sharp in the corners, and I only had to correct the edges for color shifts, but on the Sony A7r, the edges are just... plain blurry....Show more →
Philip is using the Contax (C/Y) 21mm f2.8 Distagon. I believe that it is an MM version. I have one coming and should have it fairly shortly.
p.135 #7 · Official: Sony A7 and A7R Fullframe Mirrorless
beetlephoto wrote:
Hi,
Is this the Contax G-Biogon 21mm f/2.8? I've tried mine (Leica M conversion by MS-Optical on Novoflex M<>FE adapter) on my A7r, and it is just plain horrible in anything not in the center of the frame. Looks like a holga, really even stopped down to f/11. But my tests were done at infinity, hence my question about your lens
And I'm not even talking about the red/magenta edges, but Cornerfix could fix that. It's the smearing that is actually horrible, or should I say blurring I had used it with success on my Leica M9, it was sharp in the corners, and I only had to correct the edges for color shifts, but on the Sony A7r, the edges are just... plain blurry....Show more →
I think that at this point it would be fair to say that any Zeiss Biogon design is to be approached with the greatest caution for use on the A7/A7R. Even the Distagon lenses need careful checking.
p.135 #8 · Official: Sony A7 and A7R Fullframe Mirrorless
Ok, this is a set of crop photos from:
Nikon D600 + Samyang 14mm vs.
Sony A7 + 10-18 @15mm
Shot at 'infinity', using tripod, 10 sec. timer, OSS off, etc.
Note, D600 is at f/8, Sony is at f/10. It's already an apples to tangelos comparison, so whatever. I did not put the Sam on the A7 because I already tested it previously and it's abysmal w/ my adapter. D600 does show some moire in the cat-tails. LR sharpening is at 25, which seems a bit too much still.
These images do have some basic processing as the Sony images were underexposed 2/3 stop.
p.135 #9 · Official: Sony A7 and A7R Fullframe Mirrorless
FE55/1.8 lenses are showing up across the U.S. today.
For Canadians: I checked with Sony Canada - their shipment was logged into their central distribution warehouse this morning. Those with pre-orders in Toronto will be chiming in here soon while westerners probably won't see lenses until next week unless Sony opts to use air freight instead of their usual ground-freight delivery of back-ordered product to dealers (including their own stores).
Either way they'll probably be in stores across the country before Dec 25.
p.135 #10 · Official: Sony A7 and A7R Fullframe Mirrorless
Sony's a7(r) designer:
'In order to realize the highest quality anyway, is you use a image sensor put out the excellent image quality most. I will provide customers with the highest quality in the still camera. I thought when considering the "flow Sony" how you incorporate there, it was placed in a small body as much as possible the sensor full-size, bring out the best image quality from it, and become the answer.'
p.135 #11 · Official: Sony A7 and A7R Fullframe Mirrorless
mco_970 wrote:
Ok, this is a set of crop photos from:
Nikon D600 + Samyang 14mm vs.
Sony A7 + 10-18 @15mm
Shot at 'infinity', using tripod, 10 sec. timer, OSS off, etc.
Note, D600 is at f/8, Sony is at f/10. It's already an apples to tangelos comparison, so whatever. I did not put the Sam on the A7 because I already tested it previously and it's abysmal w/ my adapter. D600 does show some moire in the cat-tails. LR sharpening is at 25, which seems a bit too much still.
These images do have some basic processing as the Sony images were underexposed 2/3 stop.
I still haven't tried my 10-18 on the A7. From your examples I don't think we could expect much better from a lens designed for APS-C. Usable in the right circumstances but I will probably still sell mine.
p.135 #12 · Official: Sony A7 and A7R Fullframe Mirrorless
theophilus wrote:
I still haven't tried my 10-18 on the A7. From your examples I don't think we could expect much better from a lens designed for APS-C. Usable in the right circumstances but I will probably still sell mine.
Yeah, my conclusion is about the same - I will say that focusing the 10-18 w/ the EVF outdoors was fantastic. So much nicer than focusing the Samyang w/ the OVF. I could actually see what I was doing, whereas I was pretty much flying blind with the Samy...
p.135 #13 · Official: Sony A7 and A7R Fullframe Mirrorless
mco_970 wrote:
Yeah, my conclusion is about the same - I will say that focusing the 10-18 w/ the EVF outdoors was fantastic. So much nicer than focusing the Samyang w/ the OVF. I could actually see what I was doing, whereas I was pretty much flying blind with the Samy...
For sure it means the 10-18 isn't a landscape champ but is still a great option for perspective work.
p.135 #14 · Official: Sony A7 and A7R Fullframe Mirrorless
The metabones adapter for the canon lenses is appallingly made. Very difficult to put onto the lens and requires serious amount of force to remove. I am afraid to use the adapter as it looks like it will damage the lens. Not good for something that costs a fair bit.
If I was using a cheap Chinese product, my problem. Metabones claims to be quality and charges as such but delivers a very inferior product.
p.135 #15 · Official: Sony A7 and A7R Fullframe Mirrorless
mco_970 wrote:
Yeah, my conclusion is about the same - I will say that focusing the 10-18 w/ the EVF outdoors was fantastic. So much nicer than focusing the Samyang w/ the OVF. I could actually see what I was doing, whereas I was pretty much flying blind with the Samy...
Hey, glad you came to a conclusion. Light doesn't last that long this time of year so I haven't been able to do anymore test with lens. I'm not very optimistic so it's low on my priority.
Just curious, are you guys selling your NEX? I have a NEX-7 and this lens is great on it so I'm in different boat. Keeping the NEX 7 to use with this lens and as a backup sounds like a very appealing proposition. I have no doubts that a great FE wide on an A7 or A7R will likely be better, but look at the size differences! I toyed with the idea of buying the Olympus 21/3.5, but I know that eventually, Zeiss will come out with high quality MF FE lenses and I'd rather not buy lens and adapters that I'll use for a few months and then sell. I'd rather have a stable full of native Zeiss lenses than a hodgepodge of old lenses and adapters.
p.135 #16 · Official: Sony A7 and A7R Fullframe Mirrorless
Agree 100% on the A7(R) viewfinder. I was quite surprised how much better it is over the NEX 7's. This is probably the first EVF that makes me lose interest in OVF, other than the really nice large ones you get in medium format cameras. I was taken aback by how easy it was to manual focus my Nikkor 50/1.2 and 85/1.4 with this EVF. I am so loving this camera at the moment.
p.135 #17 · Official: Sony A7 and A7R Fullframe Mirrorless
'Agree 100% on the A7(R) viewfinder. I was quite surprised how much better it is over the NEX 7's.'
I was very surprised how much better it is over the RX1 and a99! You simply forget it is not optical a lot of the time, so much I forgot to use the histo sometimes. Manual focusing on the camera is money for old rope...if you miss, don't blame the camera!
p.135 #18 · Official: Sony A7 and A7R Fullframe Mirrorless
how you manual focus? Focus magnify? Just curious why everybody say manual focus is easy. Without magnify, my hit rate is not high at all, especially at distance. philip_pj wrote:
'Agree 100% on the A7(R) viewfinder. I was quite surprised how much better it is over the NEX 7's.'
I was very surprised how much better it is over the RX1 and a99! You simply forget it is not optical a lot of the time, so much I forgot to use the histo sometimes. Manual focusing on the camera is money for old rope...if you miss, don't blame the camera!
p.135 #19 · Official: Sony A7 and A7R Fullframe Mirrorless
With my 35/1.4 or 85/1.4 wide open, I can focus the A7 almost every time in reasonable light. When it gets darker, or when I stop down a couple of stops, I need the magnifier.
p.135 #20 · Official: Sony A7 and A7R Fullframe Mirrorless
zhangyue wrote:
how you manual focus? Focus magnify? Just curious why everybody say manual focus is easy. Without magnify, my hit rate is not high at all, especially at distance.
For critical sharpness, yes, the magnifier is a must. The EVF is so good, I don't even bother with focus peaking. The reason why it's so easy is because the clarity in the EVF. I can focus at f/1.4 and f/1.2 and clearly see where the focus is inside the EVF. Then I magnify and fine tune to get critical sharpness.
I had used it with success on my Leica M9, it was sharp in the corners, and I only had to correct the edges for color shifts, but on the Sony A7r, the edges are just... plain blurry.