<p>On clear nights, I mount my Samsung Galaxy S10 to my 130mm aperture telescope and take pictures of certain deep-sky objects. Recently, I took pictures of the Orion Nebula. In order to get the optimal single-exposure pictures, I set the ISO to 320 and the shutter speed to 4 seconds. The shape of the nebula's cloud and the colors were relatively apparent, but unfortunately, I noticed streaks just beginning to appear in my pictures. The 500 rule says that the exposure time is not enough to create streaks, but I'm looking through a telescope instead of just a DSLR with a lens attached to it.</p>
<p>Does the <a href="https://www.slrlounge.com/glossary/500-rule-photography/" rel="nofollow noreferrer">500 rule</a> apply to photography <em>through a telescope</em>?</p>

CC BY-SA 4.0
2023-01-11T21:32:52.157Z
It's much more of a guideline than a rule, it's also been called, the 200, 400, 500, and 600 "rule".  It depends a lot on the resolution of your camera, so you have to experiment with your equipment.  But it does apply as much to telescopes as any other lens.
Greg Miller
CC BY-SA 4.0
2023-01-11T23:41:59.287Z
https://www.scantips.com/lights/stars.html
Aaron F
<photography>
Does the 500 rule apply to astrophotography with a telescope?
Sovereign Inquiry
# Does the 500 rule apply to astrophotography with a telescope?

(Asked by: username_0 on 2023-01-11)

On clear nights, I mount my Samsung Galaxy S10 to my 130mm aperture telescope and take pictures of certain deep-sky objects. Recently, I took pictures of the Orion Nebula. In order to get the optimal single-exposure pictures, I set the ISO to 320 and the shutter speed to 4 seconds. The shape of the nebula's cloud and the colors were relatively apparent, but unfortunately, I noticed streaks just beginning to appear in my pictures. The 500 rule says that the exposure time is not enough to create streaks, but I'm looking through a telescope instead of just a DSLR with a lens attached to it.

Does the [500 rule](https://www.slrlounge.com/glossary/500-rule-photography/) apply to photography *through a telescope*?

**Tags:** photography

> **Comments:**
> **username_1**: It's much more of a guideline than a rule, it's also been called, the 200, 400, 500, and 600 "rule".  It depends a lot on the resolution of your camera, so you have to experiment with your equipment.  But it does apply as much to telescopes as any other lens.  
> **username_2**: https://www.scantips.com/lights/stars.html  

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