Uploaded August 2023 | Updated September 2026, 1 day ago

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Most people complained they can't achieve focus with the cheap Samyang 800mm mirror lens. F.8 .
This is an example what I was able to achieve with a 7h of total exposure stacked 25 sec, ISO 8000 , 40 darks, bias and 20 flats with a Sony a7s full spectrum .

#astrophotography #fullspectrum #sonya7s #andromeda #andromeda800mm #800mm