this post was submitted on 17 Mar 2025
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Stopping down doesn't always give you sharper images. You may run into diffraction softening.
Focusing and then stopping down may shift your focal plane. Try to focus at your chosen aperture.
Try to use the electronic shutter function for astro photography. Even the shutter moving across the sensor can cause vibrations.
The 500 rule is useful for astro, but with modern higher resolution sensors, the NPF rule is better suited.
Not getting amazing astro shots? You may need to modify or buy a camera that is sensitive to Hα (Hydrogen-alpha) removing the infrared/IR filter off your camera will allow you to shoot full spectrum. Although you will need something to only allow 450 to 520nm and from 640 to 690nm into your sensor.
Sensors will always have dead or stuck pixels. You can take 10-20 black frames to try to help your image processor find and erase them.
Optical vignetting is common when you shoot wide open. Stop down 2-3 stops from your max aperture to try and remove the effect.
Shooting expired film is fine, just make sure you over expose 1 stop per decade it's expired. So a 20 year old film, shoot 2 stops over exposed.