At 9/11/2021 03:23 PM, Mike wrote:
>Not sure how many are interested in astro observations using different cams
>but here goes. So far have downloaded files from the Oly and A7rIII and did a
>quick look at files.
>
> From work flow vantage point starry sky AF is just the cat's meow on the
> E-M1MkIII. I had more trouble with my Sonnie as I did not listen to Moose
> an tape the MF switch on the lens to MF.
>I focused on Jupiter and reframed frequently. The Live view boost on the
>Sonnie was OK when practicing at home with a bunch of ambient light from light
>pollution but the back LCD was very very dark and really had to crank up the
>ISO and take test shots. The Oly EVF or LCD was terrible at first at home
>but there are two settings on the gain--use "ON2" and can use it to frame just
>fine---advantage Oly for focus and framing.
>
>Checked out "hand held high res mode." I had Marnie try it a few times but it
>takes forever. As long as the sky is over 50% or so it aligns the stars just
>fine!!! Colors are more accurate too.
>Now as we didn't reframe and shoot a high res shot for the foreground might
>have to try AI gigapixel to match the resolution as the foreground of course
>is thus blurred in the high res shot.
>Curiously the tripod high res mode doesn't really do the job for this
>application and limited to ISO 1600. Still very cool.
>
>Hand held high res:
>
>
>https://tinyurl.com/4m78hshd
>
>https://youtu.be/RxwYZ5HaYMM
>
>Advantage Oly.
>
>
>Lens choices:
>
>Well try to find ultrafast super wide zoom or prime that is AF in MFT. Slim
>pickings. The PL 12/1.4 is fine with a good copy and I rented the PL
>10-25/1.7. It felt HUGE and bigger than my Siggie 14-24 for Sonnie though not
>as wide. Well it is really 100gm lighter but feels larger as is 88mm in
>diameter. We had the Oly 7-14/2.8 as well but it is a bit slow given the
>noise disadvantage of the sensor and quite a bit of distortion at 7mm---don't
>use ACR to convert as will ruin the stars in the corners.
>The Siggie (60%reported on FM to be largely centered) is about as good as a
>hand full of primes. There is a 20/1.8, 14/1.8 24/1.4.
>Advantage Sonnie.
>
>
>
>https://tinyurl.com/pfzz838s
>
>Some would say this is comparing apples and oranges and mebbe one is even a
>vegetable but that is what is available.
>
>
>I am guessing the Sonnie has about a 2 stop noise advantage given larger
>sensels with bigger photon wells and 4 times the area and advantages of more
>down-sampling but stacking or HHHR mode and careful processing may render this
>less important. Results---TBD.
>
>Eyes in the sky, Mike
I came across this site: https://www.spencerscamera.com/astro-conversions.cfm
WayneS
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