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Anyone else wish someone made a 40mm RACI

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11 replies to this topic

#1 Nippon

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Posted 20 October 2019 - 10:20 PM

For either of my 4" refractors I wish someone made a 40mm RACI finder. Synta/Orion has them in 6x30 and 9x50 but only straight through versions of a 40mm. For smaller scopes a 50 is a bit big and can get in the way of viewing. The 6x30 is a good fit physically but a bit dim. Surely I'm not the only one that would buy one.


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#2 Joe1950

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Posted 20 October 2019 - 10:26 PM

You can add me, Nippon!  Perfect size for my scopes.


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#3 25585

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Posted 21 October 2019 - 11:52 AM

Are these finder apertures true or stopped down internally? What are their effective apertures?



#4 Nippon

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Posted 04 November 2019 - 12:24 AM

The only stopped down finders I've run across are cheap single element toy finders. Most are cemented doublet achromatic objectives that are what they say they are as far as the clear aperture. Most seem to have one baffle to help contrast not stop the objective down. 


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#5 Far Star

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Posted 04 November 2019 - 03:35 AM

Yes - for smaller scopes, a 40 mm RACI finder would be the "sweet spot".


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#6 noisejammer

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Posted 04 November 2019 - 01:29 PM

Borg used to offer a 36mm ED .. 45mm OD tube. If you can find one, add an Amici prism and you're sorted.


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#7 clearwaterdave

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Posted 04 November 2019 - 06:18 PM

Be nice if they made it ultralight as well.,It's odd me saying this because I just got a long scope that is very nose heavy.,lol.,For this scope I would like a leadweight finder.,

  But I agree 100%., a 40mm.,maybe 6x maybe 7x.,would be great for smaller scopes.,cheers.,


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#8 NGC 2419

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Posted 04 November 2019 - 07:09 PM

I'd settle for a 6x30 that didn't come with a ridiculously long mounting stalk.

Attached Thumbnails

  • 6x30raci.jpg

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#9 Castor

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Posted 05 November 2019 - 07:26 PM

Hi,

 

Count me in, Nippon! smile.gif  For many years now I wish someone made a 40mm RACI finder for using with my 3-inch refractors, but no luck!

 

For a while I even considered the wild idea of buying an Orion 8x40 straight finder scope, then finding a way to shorten the tube and somehow attach it to the rear part of an Orion 6x30 RACI finder scope, but I would still have to deal with the inadequate (too tall) bracket included with the 40mm finder since AFAIK there is no commercial low-profile bracket available for 40mm finders.  No point trying to save weight and size using a 40mm finder (instead of a 50mm) to then put it on a tall bracket that probably creates as much leverage as a 50mm finder on a low-profile bracket, so I abandoned that idea before I started!

 

I agree with Far Star, a 40mm RACI finder would be the sweet spot for many small telescopes! ubetcha.gif 


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#10 Castor

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Posted 05 November 2019 - 07:35 PM

I'd settle for a 6x30 that didn't come with a ridiculously long mounting stalk.

 

Hi NGC 2419,

 

Just like you, I wish there was the option for buying a 6x30mm RACI finder on a low-profile bracket instead of the long mounting stalk!

 

I found a bracket (Acouto Adjustable Finder Scope Bracket) that is perfect for the Orion 6x30 RACI finder scopes on my small Tele Vue refractors, but unfortunately the base is a little too narrow for using it without modifications with Synta telescopes (like Celestron, Orion, Sky-Watcher, etc.) that use a Vixen-type finder foot.  Here:

 

https://www.amazon.com/Acouto-Adjustable-Flashlight-Astronomical-Telescope/dp/B07MNGK34K/ref=pd_cp_421_1/134-9372051-4836060?_encoding=UTF8&pd_rd_i=B07MNGK34K&pd_rd_r=1c803a82-64ed-492f-933b-ea8b67f3133f&pd_rd_w=YItpH&pd_rd_wg=8CJ4t&pf_rd_p=0e5324e1-c848-4872-bbd5-5be6baedf80e&pf_rd_r=C8YSSY79AE4N0DAZ3J5D&psc=1&refRID=C8YSSY79AE4N0DAZ3J5D

 

Some observers have successfully adapted it for their Synta telescopes replacing the thumbscrew included on their Synta foot with a longer thumbscrew or using a shim for a tight fit, but not everyone likes to improvise.   Here is a link to my post with plenty of photos of the bracket:

 

https://www.cloudynights.com/topic/635853-a-low-profile-bracket-for-6x30mm-raci-finder-scope-for-small-tele-vue-refractors-pictures/

 

Here are a couple of photos of the Orion 6x30 RACI finder scope on the Acouto bracket, including a close-up showing the loose fit on a Synta finder foot (base).

Attached Thumbnails

  • Solomar-Finder Bracket+Orion-6x30 RACI finder-crop-1000x878_150937.jpg
  • Solomark-finder_bracket_loose_fit_on_Synta_100ED_finder_base-crop-900x900_111406.jpg

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#11 NGC 2419

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Posted 05 November 2019 - 10:14 PM

...Some observers have successfully adapted it for their Synta telescopes replacing the thumbscrew included on their Synta foot with a longer thumbscrew or using a shim for a tight fit, but not everyone likes to improvise. Here is a link to my post with plenty of photos of the bracket:


Thanks. I saw that thread and was hoping for something better than a shim and a longer screw, but it might have to do.

Cheers!
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#12 Castor

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Posted 05 November 2019 - 10:55 PM

Thanks. I saw that thread and was hoping for something better than a shim and a longer screw, but it might have to do.

Cheers!

 

You are welcome!  Yes, it’s a real shame that the manufacturer of that bracket did not get close enough to the average size of the finder foot on most Synta telescopes! 4.gif 




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