Latest or all posts or last 15, 30, 90 or 180 days.
Upgrade the memory of your 2020 iMac up to 128GB
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$3049 $2399
SAVE $650

$3508 $2998
SAVE $510

$998 $848
SAVE $150

$3999 $2998
SAVE $1001

$2299 $1799
SAVE $500

$1597 $1297
SAVE $300

$80 $33
SAVE $46

$2299 $1799
SAVE $500

$1898 $1498
SAVE $400

$2799 $2299
SAVE $500

$2299 $1799
SAVE $500

$600 $400
SAVE $200

$240 $175
SAVE $65

$699 $499
SAVE $200

$400 $300
SAVE $100

$1599 $1398
SAVE $201

$2027 $1597
SAVE $430

$1699 $999
SAVE $700

$180 $100
SAVE $80

$1199 $1099
SAVE $100

$1199 $1099
SAVE $100

$999 $949
SAVE $50

$400 $300
SAVE $100

$1699 $999
SAVE $700

OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!

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”.

OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.

YEE HAH!



√ No more slow and noisy hard drives!

Save the tax, we pay you back, instantly!

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.