Latest or all posts or last 15, 30, 90 or 180 days.
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$500 $400
SAVE $100

$2198 $1998
SAVE $200

$1799 $1599
SAVE $200

$999 $779
SAVE $220

$2397 $1897
SAVE $500

$1299 $949
SAVE $350

$799 $549
SAVE $250

$1499 $1099
SAVE $400

$799 $549
SAVE $250

$2797 $2497
SAVE $300

$1997 $1797
SAVE $200

$549 $499
SAVE $50

$1699 $949
SAVE $750

$240 $175
SAVE $65

$3399 $2699
SAVE $700

$1100 $800
SAVE $300

Upgrade the memory of your 2018 Mac mini up to 64GB

Ricoh GR: Circular Ring Artifacts

Exploring the dynamic range of the Ricoh GR, I came across an ugly behavior (using the DNG raw format into 16-bit TIF).

My suspicions are detailed in my Ricoh GR Digital: Circular Ring Artifacts.

Ricoh GR is available at B&H Photo for about $800.

Ricoh GR Digital, 1/30 sec @ f/11, adjusted

Bruce D writes:

Those rings look suspiciously like lens artifacts - perhaps caused by improperly cast aspheric elements (or perhaps by poor polishing of the spherical ones.)

DIGLLOYD: yes, they do look like polishing rings on aspheric lens elements, and the Ricoh GR lens has two aspheric elements, However, this theory leaves me puzzled as to why the interiors would alternate in density (brightness). Perhaps it is due to a slight angular difference, from the polishing. It is a plausible theory, though I am not fully persuaded as yet.

Update Feb 14, 2014

Ricoh has responded and there is a firmware update.


Best Deals, Updated Weekly
View all handpicked deals...

Sony FE 24-70mm f/2.8 GM Lens
$2198 $1998
SAVE $200

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2021 diglloyd Inc, all rights reserved.