Sony A7R: What options for 24mm?

Started Mar 12, 2014 | Discussions thread
stevo23 Forum Pro • Posts: 19,767
Re: Sony A7R: What options for 24mm?

Grafix Inredning wrote:

stevo23 wrote:

FYI - the Biogons have been reported to be problematic - you want Distagons as in the ZF versions. I think there is also a Distagon 18mm ZM.

Yes i know, but some seems to work if you are prepared to stop down. I shoot interiors with a tripod and I'm usually at F8 or higher anyway.

Ron Scheffler has done som excellent tests with rangefinder lenses, the ZM 18mm, 21mm, 25 mm and many more. The Distagon 18mm needs to be stopped down too and is more expensive than the 25mm.

Ron Scheffler: Sony a7R vs. Leica M9 infinity test with 20+ Leica, Zeiss, Voigtlander rangefinder lenses.

Again, just a friendly warning, Biogons are showing the smearing and color issues that are problematic with some rangefinder lenses. I'm seeing better results from the Distagon 25, 21 and 18. The Distagon 18 ZM has some color shift that can be corrected.

From Ron's pictures, the ZM 25mm doesn't look very much worse than the ZM 18mm. Both smear in the corners wide open, acceptable (to me) at 5.6 and look quite good at F8 and above.

The distagon 25mm 2.8 is the same price as the Biogon 25mm, but the distagon is not the best Zeiss lens out there, it's needs to be stopped down to F8, even F11 to get sharp in the corners:

The 25mm biogon is not as bad as I would have thought. I still question it's value at this point for me - compared to a $136 Nikkor 24mm AIS 2.8. It's a matter of strategy and patience. If you already have the biogon, it's worthwhile. If not, the money can be saved toward a native mount version if/when it comes out.

And we hope that Sony adapts a version of their 24mm A-mount lens for the A7. The 24mm A mount distagon is perhaps perfection in this focal length. I would be very happy to see an f/2.8 FE version.

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