I Put 4 Focal Lengths Head-to-Head on Deep Sky - Here's What I Found

Curious which focal length captures the most stunning deep sky images? In this eye-opening experiment, I put 35mm, 85mm, 135mm and 650mm focal lengths head-to-head on the same deep sky object—revealing some truly shocking differences in detail, field of view, and overall image quality!

What you’ll see in this video:

Direct side-by-side comparisons of 35mm vs 85mm vs 135mm vs 650mm on the North American Nebula.
How focal length changes your results—what you gain, and what you lose
Which focal length is best for different types of deep sky targets
My biggest surprises
Practical tips for choosing the right focal length and upgrading your astrophotography setup

Whether you’re just starting out or looking to upgrade your gear, this video gives you the clarity you need to make smarter equipment choices and capture better night sky photos.

⚠️ AFFILIATE DISCLOSURE: Some links in this description are affiliate links. As an Amazon Associate and affiliate partner, I earn from qualifying purchases. This is at no extra cost to you and helps support the channel. I only recommend products I personally use and believe in.

Timestamps:

0:00 – Intro & Setup
0:55 – Equipment used
2:20 – Comparison of 35, 85, 135mm focal lengths
4:27 – 650mm Deep Sky Results
6:00 – Side-by-Side Comparison
6:40 – Which Focal Length Wins?
7:30 – Cost of these setups (Financial and learning curve)
9:40 – My Recommendations

Gear Used (with links to amazon):

Canon 600D modified for astro.
Celestron 130slt tube.
Canon 17-85mm EF lens: https://amzn.to/4gEzVm8
Samyang 135mm F2.8 lens: https://amzn.to/4myCsiW
Ioptron CEM26 equatorial mount
SV106 autoguiding scope: https://amzn.to/3KkDl1e
SV305 autoguiding camera: https://amzn.to/4nllHZW

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More Information:
Mosaics:
https://astroimagery.com/techniques/p...
What is Focal length?:
https://astroimagery.com/equipment/ho...

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