Nikon D7500 -v- D5300 Dark Frame comparison ( Astrophotography )
From the blog "Nikon D7500 DSLR for Astrophotography"
Below is a comparison between single dark frames taken with the Nikon D7500 and D5300 with exposure durations varying from 1 sec to 240 sec ( my usual main light frame exposure ) all at ISO400.
Firstly a graph of the standard deviation of the noise in the dark frames versus exposure time:
The standard deviation of the noise is a fairly constant 2 ADU less for the D7500 compared to the D5300 ( pretty much the difference in the read noise between the two )
However, the differen