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Russar 20mm LTM + A7R
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PostPosted: Mon Mar 17, 2014 6:22 pm    Post subject: Russar 20mm LTM + A7R Reply with quote
A difficult lens on the A7R. It has all the flaws (Color shift, Vignetting and Smearing). Close focus is a nice surprise, the marking says 0.5m, but mine focus down to around 30cm.

















PostPosted: Mon Mar 17, 2014 6:41 pm    Post subject: Reply with quote
That's not too bad.
Does the smearing and color shift so unpleasant that you need to convert to BW?

Lens does look very sharp in center area.
Remind me a bit like pentax 110 lenses on nex.


PostPosted: Mon Mar 17, 2014 6:43 pm    Post subject: Reply with quote
20mm rangefinder lens on A7R - no wonder it is difficult. Wink
With that in mind the results are really not too bad.


PostPosted: Mon Mar 17, 2014 7:03 pm    Post subject: Reply with quote
Impressive, although it has flaws...Vignetting can be used clever and adds.


PostPosted: Mon Mar 17, 2014 8:54 pm    Post subject: Reply with quote
Thank you all. This is a nice little "collectors" lens, but it is also the most challenging lens to use with the A7R in my collection.

It`s pretty nice to make BW shots with, but I wouldn`t recommend this lens for landscape color. The main problem is that the areas with problems are very uneven, both smearing and color shift and it`s difficult to correct it without using lots of time...

Perhaps this would be a better lens in the future with sensor improvement. Wink



PostPosted: Mon Mar 17, 2014 8:59 pm    Post subject: Reply with quote
Well, you could call it the "teddybear" lens, if I looks at your drawing... Laughing


PostPosted: Mon Mar 17, 2014 9:27 pm    Post subject: Reply with quote
Wow series Lars, what else Smile


PostPosted: Mon Mar 17, 2014 10:25 pm    Post subject: Reply with quote
Nordentro wrote:
It`s pretty nice to make BW shots with ....

What about the posterisation in the skies ?
Quote:
Perhaps this would be a better lens in the future with sensor improvement. Wink

Maybe it's Sony's processing methodology (lossy compression of RAW files), and not the sensor, that's the problem.


PostPosted: Tue Mar 18, 2014 3:34 pm    Post subject: Reply with quote
sichko wrote:
Nordentro wrote:
It`s pretty nice to make BW shots with ....

What about the posterisation in the skies ?
Quote:
Perhaps this would be a better lens in the future with sensor improvement. Wink

Maybe it's Sony's processing methodology (lossy compression of RAW files), and not the sensor, that's the problem.


Posterisation is sometimes visible (and more visible in BW) in gradients and is not lens dependent My guess is that this is a RAW Compression Algorithm problem.
There is a firmware update tomorrow with promised better IQ results, so lets see if this is one of the things that may disappear. Wink

I also hope for better sensors in the future to kill more of the color shifts and smearing for RF wide angles. They may be able to tweak it even better with software, but I doubt major improvements with today's sensor.

A7R has it flaws, but if it shines, it shines pretty good Very Happy


PostPosted: Fri Apr 11, 2014 3:39 pm    Post subject: Reply with quote
Edited

Last edited by bernhardas on Sat Apr 02, 2016 7:47 am; edited 1 time in total


PostPosted: Sat Apr 12, 2014 10:03 am    Post subject: Reply with quote
I had mentioned that a couple of entries before bernhardas. Seems you have been missing a lot lately, as you just discovered this thread? Laughing Laughing Laughing


PostPosted: Sat Apr 12, 2014 4:31 pm    Post subject: Reply with quote
It`s one of those dancing beers probably Wink
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