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
>>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.
Themed Olympus Photo Exhibition: http://www.tope.nl/