[Top] [All Lists]

Re: [OM] Calling all Pixel Peepers

Subject: Re: [OM] Calling all Pixel Peepers
From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
Date: Sat, 1 Jan 2022 20:17:29 +0000 (UTC)
Cc: usher99@xxxxxxx
<<Given all that I don't think your test is going to tell you what you want to 
<<know. Perhaps go out to one of the marshes, angle the horizon and take a 
<<at infinity, which seems to be the way they do it on FM 

Hi Wayne,
Thanks for the links.   The methodolgy I used is very similar to Fred's.  I 
don't like handholding in the cold and turning the cam upside down just makes 
the images easier to compare in LR. 
Sharpness testing at ultrawide FL is tough but basically looking for 
decentering.  The air was cold and the distance essentially at infinity for the 
FL's tested.   


Sigma has better QA than most and now have a way to check MTF and tweak during 
production.   Roger at Lensrentals has said it is usually more expensive for a 
company to try and fix a decentered lens than toss it and ship our another. 

I was very careful with my test methodology; the problem is determining what is 
"acceptable" for intended use. 

Well centered or not, Mike
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/

<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz