Latest or all posts or last 15, 30, 90 or 180 days.
Memory Upgrades for 2019 Mac Pro - Save Up to 65% vs Factory Costs
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$898 $798
SAVE $100

$1499 $1349
SAVE $150

$2799 $2499
SAVE $300

$1499 $1399
SAVE $100

$1499 $1399
SAVE $100

$7999 $6999
SAVE $1000

$2799 $2499
SAVE $300

$250 $220
SAVE $30

$379 $249
SAVE $130

$1199 $1099
SAVE $100

$799 $599
SAVE $200

$999 $949
SAVE $50

$1099 $999
SAVE $100

$1999 $1449
SAVE $550

$1299 $1099
SAVE $200

$1099 $999
SAVE $100

$2799 $2499
SAVE $300

$449 $389
SAVE $60

$400 $310
SAVE $90

$1699 $999
SAVE $700

Leica 90mm f/2 APO-Summicron-SL ASPH: Focus Instability

Get L-mount system at B&H Photo.

My review of the Leica 90mm f/2 APO-Summicron-SL ASPH and Leica 75mm f/2 APO-Summicron-SL ASPH were severely impacted by a problem which I document in this analysis. It was very confusing, and cost me irreplaceable time and effort to diagnose, damaging hundreds of my images and forcing me to shoot and reshoot with the same crappy results until I worked out an imperfect work-around. I first noted the issue in Leica 90mm f/2 APO-Summicron-SL Aperture Series: Mosaic, Focus Shift.

In L-Mount mirrorless:

Leica 90mm f/2 APO-Summicron-SL ASPH: Unstable Focus: Orange Pine Tree Trunk

Anyone using Leica SL lenses would be well advised to read this piece. I offer an imperfect work around prone to repeated sub-optimal results in some conditions, though usually successful. The same issue applies to the Leica 75mm f/2 APO-Summicron-SL ASPH and I will soon publish a similar series showing that. I suspect that it affects all or at least most Leica SL lenses.

Below, two frames at f/2. The lens focus was not changed by me. I can reproduce this behavior at will.

Crops from 93 megapixel images
f2 @ 1/640 sec Multi-Shot HighRes, ISO 50; 2019-06-08 11:39:59
Panasonic S1R + Leica APO-Summicron-SL 90mm f/2 ASPH

[low-res image for bot]

Save the tax, we pay you back, instantly!
View all handpicked deals...

Apple 21.5" iMac with Retina 4K Display (Early 2019)
$1499 $1349
SAVE $150

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.