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What magnitude should I strive for with DSO? (SkySafari 7 Pro)

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4 replies to this topic

#1 Whereisclearsky

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Posted 04 December 2021 - 09:46 PM

Hi,

 

Just bought SkySafari 7 Pro on my iPhone, and I'm trying to set it up for DSO imaging.

I use a APS-C camera and a 135mm f2 lens on a tracker.

 

I'm wondering up to what magnitude does it make sense to try and capture these objects?

At the moment I have it set up to mag 10.

 

Also any other tips for SkySafari welcomed :D

 

Thanks!



#2 Rocklobster

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Posted 09 December 2021 - 01:11 AM

Well with my f/5.6 70-300 lens and my stock 18-55mm that came with the 4000d, I can image down to 15magnitude.
That's absolutely the limit. But 14-14.5 is easy.

You should be able to go much dimmer than 10-11 in my opinion.

Sent from my WP5 using Tapatalk
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#3 Leia

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Posted 09 January 2022 - 11:28 AM

I have an APS-C Canon and 135 f2.8

In a stack of ~3hrs, got IC 469 faintly. That's mag 13.6

Also got NGCs 2300, 2276 and 3172 (very faintly). The last one is 14.9. But those are very faint objects. 

Yes, you can image below mags 10-11

This was untracked, with 8sec subs.

https://nova.astrome...ed_full/6073509


Edited by Leia, 09 January 2022 - 11:29 AM.


#4 17.5Dob

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Posted 09 January 2022 - 07:56 PM

Mag 10 is a nearly as bright as the full moon.......wink.gif

You can go wayyyyyyy deeper than that. The only problem is that the objects will be so tiny at 135mm. It'd go to mag 13 as a good compromise.

Edited by 17.5Dob, 10 January 2022 - 02:06 AM.


#5 starblue

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Posted 09 January 2022 - 09:10 PM

I have gone past Sky Safari's mag 17 limit regularly with a 1.2/3" superzoom camera at 24x zoom (~600mm EFL) in a dark sky (Bortle 2-3)--this is just the camera on a tracker. At the same site I recorded galaxies down to mag ~16.5 (no details, but one can tell they're fuzzies and not stars). With my DSLM's on scopes from in town I'm doing almost as well but in rather brighter conditions (Bortle 5-7?). These average 1-hour exposures. Mag 10 is nothing.

 

I usually set the star brightness limit to be 2-2.5 mag brighter than the DSO limit. That seems to give a good balance between the number of stars and the number of galaxies displayed.




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