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Advice Needed on Finder Needed for 13.1” Dobsonian

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#1 GaryShaw

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Posted 30 November 2020 - 09:49 AM

Hi All

I’m donating my 13.1” Odyssey Dobsonian to a camp in the country for inner city kids but, since I never had a Finder, I’d like to include one with the scope.
 

Could some of your please suggest Finders with diagonals (excellent eye relief) which are easy to see through and would make things fun and easy for ‘first time observers’?

Thank you

Gary



#2 Augustus

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Posted 30 November 2020 - 09:56 AM

Telrad. A right-angle finder is harder to use, more expensive and more likely to be damaged.


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#3 BDS316

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Posted 30 November 2020 - 10:23 AM

second the Telrad idea.


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#4 Sheol

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Posted 30 November 2020 - 03:01 PM

          I've used a RACI for years on my 8 inch Dob. It has been a God send! Never even needed the DSCs once I got back in Star hopping practice ( & got a new & better pair of glasses!). Matching stars in my PSA became quite easy with practice.

 

   Clear Skies,

     Matt.



#5 Jon Isaacs

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Posted 30 November 2020 - 06:27 PM

Hi All

I’m donating my 13.1” Odyssey Dobsonian to a camp in the country for inner city kids but, since I never had a Finder, I’d like to include one with the scope.
 

Could some of your please suggest Finders with diagonals (excellent eye relief) which are easy to see through and would make things fun and easy for ‘first time observers’?

Thank you

Gary

I use a Telrad plus a 50mm RACI Finder on all my Dobs.  

 

Telrads are good for initially pointing the scope and often pointing near an object.  A RACI is not so good for that initial pointing but more accurate for putting the object in the field of view.

 

I recommend the GSO 8x50 finder.  I measured the field of view at 5.6 degrees.  It comes with a dovetail shoe to mount it to the scope so you are all set.

 

https://agenaastro.c...age-finder.html

 

Jon


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#6 Sheol

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Posted 30 November 2020 - 07:06 PM

         I have seen 'scopes that use both. Which I guess makes sense, the Telerad puts you into the general area the RACI lets you star hop right to the object you want. But once I got good at using mine, I leaned to do stuff like this: Start at the left top star of Corvus, follow the trail of fainter stars up to the Virgo border and there is M.104. But yes, learning how to aim an RACI does take some practice. My new 'Scope has a straight thru finder. It might be easier to use. We will find out in a few days.

 

   Clear Skies,

      Matt.



#7 GeneT

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Posted 30 November 2020 - 07:18 PM

I've tried most of them and Telrad is my recommendationn.


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#8 GaryShaw

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Posted 01 December 2020 - 09:18 AM

Thank you very much everyone....for this Summer Camp population simplicity is best so we’ll start with the Telrad....

 

Safe and relaxing Holidays !

Gary


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#9 izar187

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Posted 06 December 2020 - 09:54 PM

If going with a zero power finder like the well recommended Telrad, then also consider a DIY peep sight.

A small block of pine  2x2 wood 6" + long, with an eye screw in each end.

One larger toward the sky end, one smaller toward the eye end.

They can be fine tune aligned once on the scope, by bending them little to the right or left, and threading them in or out of the block of wood, as needed. 

The small 2x2 of pine is what gets screwed or glued or velcro'ed to the sono-tube near the focuser. 

Long thin shank eye screws(or screw eyes), so they can be adjusted by a little determined bending, rather than pounding.

PVC coated or fuzzy velcro or tape on the eye end one will protect peoples glasses, in the dark.  

Grab several different sized of eye screws at the local hardware store, to look through to pick the best two.

 

Two pin sights work also, but are kinda dangerous to eyes, especially for kids in the dark.

Two V blocks work too, but are not as easy to adjust once mounted.

 

All zero power peep sights, whether eye screws, two pins, or V blocks are basically impervious to...

dew, frost, batteries being left on, most accidental impact and presumably theft. IME 




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