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Is a 127mm refractor enough for DSOs?

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#51 stevew

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Posted 10 April 2020 - 06:27 PM

"Is a 127mm refractor enough for DSOs?'

 

If your sky is dark enough, and your a well trained observer it is.

Just ask Stephen James O'mera, who has written many books using 4 and 5 inch refractors.

 

Personally I'd rather use a 4 or 5 inch refractor under a pristine dark sky than a 10 inch from my light polluted back yard.


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#52 Diomedes

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Posted 16 April 2020 - 07:52 PM

Rings came in today 

 

49782268348_b3b10ec2be_b.jpgUntitled by Greg Borrelly, on Flickr
 

49782268338_a56cbd7dae_b.jpgUntitled by Greg Borrelly, on Flickr


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#53 Jond105

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Posted 16 April 2020 - 07:58 PM

Rings came in today 

 

49782268348_b3b10ec2be_b.jpgUntitled by Greg Borrelly, on Flickr
 

49782268338_a56cbd7dae_b.jpgUntitled by Greg Borrelly, on Flickr

Nice


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#54 oldtimer

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Posted 28 April 2020 - 06:17 AM

I'm on the high side of 70 now and don't get out to really dark sky that often. I do most of my observing from my back yard in a red zone. I like observing open clusters. I have found that my 4" F7 Apo  requires significant magnification to even make many open cluster visible. At lower power they disappear.  The point is that the location (bortle scale) you mostly observe from will determine how effective a 4 or 5 inch scope will be. I now do my back yard observing with my Vixen NA140SSF Petsval . With its 4 element design and 5.5" objective It works like my 4" APO at a dark sky location.


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#55 RichA

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Posted 28 April 2020 - 10:41 PM

Hello, I’m not expecting the same views as with a  8” dob but I’m curious to learn what to expect. The AR127mm is about as much weight as my twilight AZ mount can handle so I can’t really go any higher. 

To just see DSO's in the 9-11 mag range (provided they are reasonably compact) it's enough.  Detail?  No, if that's your goal, get a larger SCT, RC or Newtonian.



#56 daquad

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Posted 05 May 2020 - 06:58 PM

To just see DSO's in the 9-11 mag range (provided they are reasonably compact) it's enough.  Detail?  No, if that's your goal, get a larger SCT, RC or Newtonian.

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