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Re: [OM] Calling all Pixel Peepers

Subject: Re: [OM] Calling all Pixel Peepers
From: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Sat, 01 Jan 2022 08:19:26 -0700
At 1/1/2022 07:40 AM, I wrote:
>At 12/31/2021 04:00 PM, Mike wrote:
>>Nothing says Happy New Year like some serious pixel peeping.
>>This Sigie lens has to be sharp in the corners wide open for astro 
>>landscapes.  Sigma has quite good QA now but on FM about 1/3 end up being 
>>sent back.  I was tempted by the sonnie 14/1.8 but there are more aberrations 
>>in the corners even at f2.8, the corners are just so-so at 1.8 and the copy 
>>variation is quite large.  It is smaller and lighter and thus better for 
>>travel though.  
>>I focused on our chimney in the center of frame and then moved the cam so the 
>>chimney was in each extreme corner--200% crops. IBIS off and on tripod.  
>>These are SOOC jpegs.
>>I think modestly soft at 24mm in the rt lower corner but not badly decentered 
>>at 200%.  Good enough or not???  I can send it back for 30 days.
>I recommend reading Jim Kasson https://blog.kasson.com/lens-screening-testing/
>There are links to test targets you can download and print. I printed one on 
>ledger size paper (11x17inch) and use it for testing. For example of one of my 
>tests at 100%:

Forgot to mention.
That was the sony 24-105 at 105/4, this is the CV 110 lens wide open
One sharp lens.

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