Latest or all posts or last 15, 30, 90 or 180 days.
Up to 1527MB/s sustained performance
Upgrade Your Mac Memory
At much lower cost than Apple, with more options.
Lloyd recommends 64GB for iMac or Mac Pro for photography/videography.

Modified Sony A7R Sensor Glass: Impact on Rangefinder Lens Performance

See the prior post: Sony A7R: Sensor Glass Thickness, Ray Angle and Image Degradation: Kolarivision Modification.

Today I shot the modified Sony A7R (“SonyA7R.mod”) against a stock Sony A7R, using six rangefinder lenses (these links are general info on these lenses, shooting results pending):

Every one of these lenses is affected by ray angle (including the 50/2 APO). The effects include substantial loss of resolution in outer zones (mostly due to severe astigmatism caused by the sensor cover glass), but also strong magenta color shading (vignetting by color).

In each case, the A7R.mod improved matters substantially. That’s the good news. The less good news is that color shading remains more or less the same.

NOTE: as per the “which guide” policy for the past 2-3 years, lens coverage goes into the native guide, regardless of the shooting platform. These are all rangefinder lenses for the Leica M platform and (US$20K of lenses at that), thus performance analysis goes into Guide to Leica. The Leica M context also offers commentary in context of the available reference material on each lens when shot on the native camera (Leica M), something lost when split across guides and one of the several compelling reasons for “lenses in their respective native guides”.


See also Nikon wishlist
B&H Deal ZoneDeals by Brand/Category/Savings
Deals expire in 19 min unless noted. Certain deals may last longer.
$999 SAVE $700 = 41.0% Canon EOS 6D DSLR in Cameras: DSLR
$998 SAVE $200 = 16.0% Sony DSC-RX10 II in Cameras: Point and Shoot

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.