How to review .FIT files? - Forums

Topic starter

Mar 16, 2025

Hi!

Using the AsiAir, all my subs are in .fit file format. I use Photoshop as my main processing tool, but it seems it doesn’t support this format.

Any advice on how to review the subs quickly before stacking?

Thanks!

Dominic

Well Written Engaging

Kristof Vandebeek

Mar 16, 2025

I use ASI fits viewer to review my fits file quickly - I open the histogram, I zoom in to 100% and use the left/right arrow keys on my PC or Mac to browse through the files.

Helpful Concise

Jos Stassen

Mar 16, 2025

I use QuickFits on my Mac. Fast, auto stretch and nice integration into the OS.

Phil

Mar 16, 2025

ASI fits view in ASI studio can view them.
Can download it here.
https://www.zwoastro.com/software/

Tony Gondola

Frequent contributor

Mar 16, 2025

Affinity Photo and GIMP can read .fits files. You could also download the Seti Astro Suite to read them. really, lots of options.

Helpful

Erik Westermann

Mar 20, 2025

Here's an alternative (my site, explains how to install):

https://remoteastrophotography.com/2022/05/preview-fits-files-using-quicklook-for-windows

It's called QuickLook and you can just hop from file to file in Windows Explorer and it'll show you each image (stretched). I find it great for large datasets.

You can also use it for images and other content. Just tap space on your keyboard to activate it in Windows Explorer, and then hop from file to file.