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28mm for A7
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PostPosted: Thu Dec 17, 2015 1:21 am    Post subject: Reply with quote

uhoh7 wrote:
The A7II would add IBIS, and another 4-500 USD to the equation with no improvement outside the shots where IBIS helps. The very sharpest shots will always be without IBIS

Sorry but that's just not true. The A7II is much better finished and way better handling than the A7 with the shutter being in the right position and a very secure fit even with a bigger lens mounted(sturdier mount as well and no shutter shake, yes even the A7 can still have a bit from time to time). It is just way nicer to use handheld. For some people that is more important than those sharp corners. Removing the AA filter also introduces moire with sharp lenses.
Plus, you can actually get one with a warranty. Just something to keep in mind.
For people outside the US, this mod just makes very little sense as opposed to spending that money on one more lens that performs nicely with the stock configuration. It may make sense if one already has several lenses with significant problems.

It is pointless to continue the argument anyway, maybe I should have known better...


But to add something more useful to the thread both the Contax 28/2.8 and Nikkor 28/2.8 seem to perform just fine on a stock A7 without any major problems.

http://www.dpreview.com/forums/thread/3592104

http://www.darinmcquoid.com/28s.html

The Pentax just looks even more amazing, certainly on my list now:

http://www.darinmcquoid.com/Pentax28.html


And one more opinion about the SMC-M version being as good as the SMC-K

http://www.ashleywootton.com/28mm-landscape-lens-comparison-test/


Last edited by padam on Thu Dec 17, 2015 2:16 am; edited 1 time in total


PostPosted: Thu Dec 17, 2015 2:12 am    Post subject: Reply with quote

That's one excellent landscape shot from your modded A7, unoh7!

I'm not getting one anytime soon, so plenty of time to consider the pros and cons. Perhaps the next step is to try a few test shots from someone's A7ii body with my favorite lenses, and let the results decide it for me.

The ergos and IBIS are a plus for when I'm not usually shooting with a tripod or support.


PostPosted: Thu Dec 17, 2015 3:40 am    Post subject: Reply with quote

Germany December 2015 A warm welcome for our refugees

Sony A7 FE 28/2.0 @ 2.0





PostPosted: Thu Dec 17, 2015 4:03 am    Post subject: Reply with quote

padam wrote:
..The Pentax just looks even more amazing, certainly on my list now: http://www.darinmcquoid.com/Pentax28.html..

what am I doing wrong? I only se pics taken with the Nikkor, some with the Sony FE, but none with the Pentax
....


curious just how bad, or hopefully 'useable', my 28mm might be for landscape on my unmodified A7, I just took two test shots, sorry for the motive, just checking corner performance at infinity.
Right now I only have a humble S-M-C Takumar 3.5/28 and a M-Rokkor 2.8/28, a rangefinder lens in Leica M mount, at hand, both shot @f8

the full frame ( S-M-C Takumar ) reduced in size:



100% crop of the far left, bottom corner



and that of the M-Rokkor:


( P.S. I must mention that the M-Rokkor had the dreaded white spot issue in a very advanced state that had etched the whole inner surface of the front lens degrading IQ strongly. I repaired it which must have taken off the damaged coating, but by now I am very happy with how the repair turned out. However a perfect copy must be better, not sure if there is any noticeable negative impact on this 100% crop though )


PostPosted: Thu Dec 17, 2015 10:29 am    Post subject: Reply with quote

Nothing wrong with those corners, more than good enough. Smile


PostPosted: Thu Dec 17, 2015 1:02 pm    Post subject: Reply with quote

iangreenhalgh1 wrote:
Nothing wrong with those corners, more than good enough. Smile


I also was positively surprised. I even suppose that the somewhat weaker corners of the S-M-C are not due to sensor smearing and I did not notice any color cast.


PostPosted: Thu Dec 17, 2015 1:05 pm    Post subject: Reply with quote

kuuan wrote:

what am I doing wrong? I only se pics taken with the Nikkor, some with the Sony FE, but none with the Pentax
....


When you move over to the pictures with your mouse, the pictures switch from the Nikkor to the Pentax and you can see the difference instantly.

There is more info on fredmiranda forums, it seems that it also matters what kind of Pentax to E-mount adapter is used as some may degrade the performance.


PostPosted: Thu Dec 17, 2015 4:27 pm    Post subject: Reply with quote

padam wrote:
The A7II is much better finished and way better handling than the A7 with the shutter being in the right position and a very secure fit even with a bigger lens mounted(sturdier mount as well and no shutter shake, yes even the A7 can still have a bit from time to time). It is just way nicer to use handheld. For some people that is more important than those sharp corners. Removing the AA filter also introduces moire with sharp lenses.
Plus, you can actually get one with a warranty. Just something to keep in mind.


You are right, there are some handling differences, but A7II is also bigger and heavier. For you, the A7II is obviously better, and perhaps the MOD does not make sense, though you'd have to try one to really answer that. As to moire, I have not seen it in my samples or others. The warranty is short lived and god forbid you ever have to deal with Sony for warranty. I have many times. Not fun.

I took a look at your links and while the Pentax looks nice (I had the Nikkor 28/2 AIS), overall the trouble at 28 is just more apparent with the stock sony compared to other full frame alternatives. The deep corners trouble me less than general softness approaching the edges even at small apertures.

iangreenhalgh1 wrote:
Nothing wrong with those corners, more than good enough. Smile

If you don't care, there is nothing "wrong". But that attitude totally precludes any accurate description of performance against the FF benchmark 28s of today. There seems to be the feeling that any mention of weakness is somehow meaning a lens or sensor is worthless. I feel more knowledge and unblinking review is more useful. I'm not afraid to learn about or respect lenses or cameras I can't afford. It's nice to know what is possible Smile

Here 28 cron f/8 on the M9:


Over the Salmon by unoh7, on Flickr


Lakeside by unoh7, on Flickr

For me, 28 is critical. For what I like to do no other FL is more important. So, I've taken alot of trouble to get the best performance at 28 I possibly can. In the process I've tried many 28s and various cameras. Ian thinks I'm pretty stupid to pay the money for this 28, but it makes me happy Smile What's that worth?


PostPosted: Thu Dec 17, 2015 5:16 pm    Post subject: Reply with quote

uhoh7 wrote:
I feel more knowledge and unblinking review is more useful. I'm not afraid to learn about or respect lenses or cameras I can't afford. It's nice to know what is possible Smile

Here 28 cron f/8 on the M9:



Ian thinks I'm pretty stupid to pay the money for this 28, but it makes me happy Smile What's that worth?

Lots of CA an so-so corner sharpness at F/8 for such an expensive lens!



Laughing

cheers!

Abbazz


PostPosted: Fri Dec 18, 2015 1:09 am    Post subject: Reply with quote

Not sure why, but when zooming in, the second picture looks much sharper than the first one (also much better than that Kiron that was linked previously, modded or not)

The Summicron looks fantastic, but I am not convinced that it will be that much better than that "giant-killer" Pentax SMC-K 28mm f3.5 in those "DOF-hungry" situations. The advantage may come in more, when we see 50+ MP sensors from Sony (and maybe Leica but they might be slower).
Which is another potential issue with the mod, the Sony bodies are being replaced in a rather speedy manner. And I would rather sell the old one within the warranty period than suffer an even bigger depreciation. The A7RII has even less issues than the older bodies, so it may be a nice bargain once it gets 'outdated'. But who knows how much depreciation it will actually suffer because it is a lot more refined than the original.


PostPosted: Fri Dec 18, 2015 1:47 am    Post subject: Reply with quote

I'm happy with the Minolta AF 2.8/28 I paid 45ukp for, it works very well on my a850 and my 35mm film Minoltas, how it works on the A7 series I don't know, but I don't see any reason why it wouldn't work well.

Both of these are at f2.8:




I think this one was at f4, it was a dull day without much sunshine.



Can't say I bother looking at the corners very often, but for comparison's sakes, here's the top left corner:



I don't see any CA issues and it's sharp enough for me.


Last edited by iangreenhalgh1 on Fri Dec 18, 2015 1:57 am; edited 1 time in total


PostPosted: Fri Dec 18, 2015 1:54 am    Post subject: Reply with quote

Same Minolta AF 2.8/28 on 35mm film - Agfa Vista Plus 400 developed in the kitchen sink with Fuji chemicals, 14mpix scan.





When I eventually upgrade from my a850 to an A7 series, I will probably keep on using this Minolta AF 2.8/28, it's the best 28 I own apart from a Minolta MD 2.8/28 which is probably the same optics. The other very good 28s I have (Mamiya SX 2.8/28, Konica Hexanon 3.5/28, Minolta Rokkor-SG 3.5/2Cool are all not quite as good imho.

BTW, how does the Contax G Biogon 28 do on the A7 series?


PostPosted: Fri Dec 18, 2015 7:30 am    Post subject: Reply with quote

SLR WAs work generally quiet well with the A7 . Most of problems that could occur are due to the lens or to the photographer.
So if your Minolta is a good lens with a FF DSLR , it should work properly with an A7.


PostPosted: Fri Dec 18, 2015 9:39 am    Post subject: Reply with quote

That's good to know, cheers.