Imaging with Sony A7s

[Tony Law]

After five months of weather and mount problems I finally got to try out the A7s on my 127mm Meade 5000 APO Triplet last Saturday night.:)

M83 30 X 30sec ISO5000,
Eta Carina 30 X 15sec ISO3200
Tarantula 24 X 30sec ISO1600

All stacked in DSS and processed CS5

[SimmoW]

Nice start, one thing I've learned with the cam is that it's not magic, it still loves collecting photons, so crank it up to 4-8 mins when you can

[RickS]

Looks very promising, Tony.

[IanP]

Tony, I know, working with high ISOs is very tempting, but I have some experience with Canon 60Da and I’d rather extend the exposure time to get more photons through the scope and keep the ISO at the low end. :hi:
As RickS said, looks promising .....

[SimmoW]

I've done a few ISO experiments and found the commonly agreed natural ISO of 3200 to be the true sweet spot. 1600 or 6400 are noticeably worse re. Noise and general appearance.

[Meru]

Nice one Tony, this camera looks to be a good catch ;) Yup definitely do longer subs/lower ISO. I do 180s@ISO1600 and 300s@ISO800, and with only say minimum 10-15 frames and dark frames there's not too much noise but plenty of data :D