How Long Should my Subs Be? | Astrophotography Tutorial

How long should your subs be? A simple question but answering it correctly takes you to the heart of astrophotography… which is why it takes me an hour to explain it in the longer version which I made for my lovely patrons😂This is the quick version for folks who want a quick answer. This is a NERDS ONLY video. If you are a normal person please don't watch it!

The longer video tutorial for Patrons should give you a good understanding of how modern CMOS astro cameras work and that knowledge will help you choose the best camera to buy.

Full Length Video Contents:
00:00 Intro
00:51 Basic Level
04:21 Histogram explanation
05:00 What the histogram of your subs should look like
07:09 Advanced Level Intro
07:48 Shot Noise
08:57 Signal to Noise ratio
11:22 Sky Glow noise (light pollution)
14:30 Dark Current Noise
16:52 Read Noise
19:27 Working out your best iso/gain setting
20:32 Fixed Pattern Noise
24:37 Dithering explanation
26:02 How long should your exposures be?
28:29 running through situations where you can get away with shorter exposures and when you can’t.
31:40 working out your exposure length using your historgram
31:55 working out your exposure length using Dr Robin Glover’s website and formula
39:05 outro

[opsiialpha]

He came back when the world needed him the most <3!

[tompage]

I know you might not think it, but this was actually SUPER useful. I'm going out with my telescope and dSLR tonight for the first time.

[onewhostudies]

I'm from New York. My subs should be 8 inches if I'm a little hungry, or 12 inches if I'm really hungry. But I don't take pictures of my food. :)

[georgecarlinismytribe]

I really like straight-to-the-info tutorials. It gives people an informed starting point from which to experiment with. Great video.

[cj]

As someone just getting started - This really helps.

The format is great too - Short videos for 'quick' tips like this - but the longer videos are valuable for us nerds too.

Thanks, Mr Biscuit

[michaelhaardt]

That's actually good advice. The shape of the stars and the histogram tells it all and the preview at the end is promising that you will deliver all the details as to why that is.

[husseinhasan]

This is such a good and simple tutorial. Thanks a lot for making it and keep it going!

[markwelsh]

This was purely an ad for his Patreon channel. Nice one! lol

[glennsophie]

The longer the better. All your videos are of the highest quality, informative and entertaining.

[DanFPG]

Woop! I thought I'd have a bit of a biscuit binge and what a suprise to have a new vid!

[BlckBox]

My neighbour is getting a scope for his daughter for Xmas, I immediately pointed him to your channel, this vid is gonna help them so much!

[J-Stoic]

What good timing I started trying astrophotography last night! I do not have a tracking mount yet though! So attempting untracked for now

[sammylol]

ty so much AB. keep giving us this great content!

[GordinhoTube]

Want to learn more? Pay! I love Patrion. I can't do that because the guy who taught me didn't cover anything.

[MoseZ]

Astrobiscuit please post more? I really enjoyed watching your videos and was really relaxing for me. Keep going!

[RealBesty]

Decent advice here for “ordinary” photography, too! The penny has also dropped as to how Substack got its name :)

[Wigalot]

Yessss mate! Finally he's smashing out the tutorials!

[Allgone-bk]

Happy new year thank you for another year of great videos and more to come.

[astrospeedcuber]

I was just about to go out a shoot something and then saw this... was definitely worth the time

[Eager]

Very understandable, fun and entertaining. Great video!