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Imaging small DSOs with a Mak

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#1 GoldSpider

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Posted 14 December 2019 - 10:44 AM

Due to storage limitations, I’m considering trading in my 9.25” SCT for a 6” Mak for planetary imaging and small DSOs like galaxies and planetary nebulae. Is trying to image DSOs at f/12 just a Really Bad Idea from the get-go?

#2 descott12

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Posted 14 December 2019 - 11:22 AM

Can't you add a focal reducer??



#3 Ken Sturrock

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Posted 14 December 2019 - 12:02 PM

It's not a "bad" idea.

 

If a slow instrument suits your wants & needs for your preferred subjects and your mount can keep the OTA locked on target for the time that's required to get good signal - then go for it. People on this site don't recommend fast instruments because they are universally "better". They recommend them because they are more efficient and easier for beginners to deal with.


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#4 CCD-Freak

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Posted 15 December 2019 - 11:56 AM

"Go for it !"  cool.gif

 

I got this M66 image with an hour of 5 minute subs with my old fork mounted 8" SCT and my ASI-1600MC-Cool in my Bortle 7 backyard.

 

M66-Sigma-Str-DN-Sat-Hist-3x3-mts.jpg

 

This is where the old saying "Nothing ventured....nothing gained" applies. 

 

 

John Love

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#5 GoldSpider

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Posted 15 December 2019 - 12:13 PM

"Go for it !"  cool.gif

 

I got this M66 image with an hour of 5 minute subs with my old fork mounted 8" SCT and my ASI-1600MC-Cool in my Bortle 7 backyard.

 

attachicon.gifM66-Sigma-Str-DN-Sat-Hist-3x3-mts.jpg

 

This is where the old saying "Nothing ventured....nothing gained" applies. 

 

 

John Love

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That looks great!  Were you shooting at f/10?  I'm curious how much "harder" f/12 (or even f/15) would be.


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#6 CCD-Freak

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Posted 15 December 2019 - 02:49 PM

That looks great!  Were you shooting at f/10?  I'm curious how much "harder" f/12 (or even f/15) would be.

Yes it was at f10.  I was happily surprised when I stacked the subs.  I was not expecting much due to the light pollution in my backyard.  You will need a good mount to track at focal lengths that long.

 

John

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