Jump to content

sgl_imaging_challenge_2021_3.thumb.jpg.30e9b298c34c80517e8b443ce153fce3.jpg

  • entries
    4
  • comments
    17
  • views
    13,016

About this blog

A blog to discuss using an unmodified Nikon D7500 DSLR for Astrophotography.

Entries in this blog

D7500 has high thermal pattern noise

In an earlier post I examined the noise in single dark frames over a range of exposure times.  My conclusion was that the Nikon D7500 was a lower noise camera than the D5300.  This was also backed up by an examination of master bias frames that again strongly favoured the D7500. However ... The first image I attempted to produce with the D7500 exhibited very strong streaks in the noise. I had been in the habit of not using dark subtraction with the D5300 as it has very

MikeODay

MikeODay

Nikon D7500 -v- D5300 Dark Frame comparison ( 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

MikeODay

MikeODay

D7500 - Read noise and patterns in bias frames ( Astrophotography )

The Nikon D5300 has a well-earned reputation as one of the lowest noise DSLR cameras used for Astrophotography.  Now that I have a new Nikon D7500, I was keen to see how it compared to the D5300 in terms of the level of read noise and the extent to which that read noise is non-random ( and thus needs to be removed using a Master Bias frame to prevent it summing up during image integration).    So here goes ... ......... A single bias frame Nikon D5300: ISO400, 1/4000th second:

MikeODay

MikeODay

My new love - the Nikon D7500

It was love at first sight when I first laid eyes on the gorgeous noise curves of my dear Nikon D5300; young and beautiful with a great body and a large sensor, I was smitten.  Now, well, what can I say... my roving eye has spied a new beauty; younger with heaps of energy that should go all night and , whilst I do prefer larger sensors, I can’t stop thinking about the noise curves hidden beneath that lovely new body...   I struggled with my guilt for ages, I really did, but the time has com

MikeODay

MikeODay

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.