A7RV Noise And Hot Pixels at long Exposures

[Gschiffverre]

On a recent astrophotography shoot I took foreground images at ISO 1000, 2 minutes, F1.8. It resulted in extremely noises images with hot pixels that are unrecoverable. I have never needed to use Long Exposure Noise Reduction in any of my other cameras and have never had noise like this even at 4 minutes in any including my Sony A7iv and very old Nikon D750. The file was medium RAW 26MP with the hopes that by reducing the MP it would decrease noise levels. Outside temps were between 55-60F and not hot enough to cause hot pixels.  Is this an issue with my sensor or is the A7Rv just this bad at high ISO long exposures? I did an indoor test dark frame with same setting but at 800 ISO with lense cap on and got the same results.  I tried uploading file of 800KB but will not upload for some reason.

[XKAES]

I can't speak specifically about your camera, but mine has HIGH ISO NR and LONG EXPOSURE NR -- and each has different settings and restrictions/limitations.  On my camera, anything over 1 second is considered LONG EXPOSURE, and anything over 800 is considered HIGH ISO.  I assume you've checked your owner's manual for the options you have for these features (read the footnotes, if any -- for example, they may not affect RAW files).  They may need to be adjusted.  They might to too active, or not active enough.

Edited May 18, 2024 by XKAES

[Steven Pratt]

Try this? https://gregbenzphotography.com/photography-tips/how-to-remove-hot-pixels-from-long-exposures/