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Telrad/Rigel and finder combination anybody ?

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17 replies to this topic

#1 Voyager 3

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Posted 05 March 2021 - 08:33 AM

I've heard a reflex sight and a finder is a killer combo for starhopping . But it's also a killer combo to make the dob lose balance . So are there any dob owners with this type of combo ? 



#2 Dick Jacobson

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Posted 05 March 2021 - 08:57 AM

I've been using a Rigel/RACI combination for many years. I think it's ideal, and the 1x finder is so lightweight that it doesn't create balance problems for me. I have counterweights on most of my scopes, anyway.


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#3 vdog

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Posted 05 March 2021 - 08:59 AM

I've used RDF and RA finders in combination on all the dobs I've owned.   And yes, they are a killer combo for starhopping.  

 

Counterweights are a dob owner's best friend.  There are the systems they sell but many people just use plate magnets, ankle weights, etc.  I use plate weights suspended from the back end of my dobs.

 

You're always going to need more weight than you think.  Go heavy.


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#4 Jon Isaacs

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Posted 05 March 2021 - 09:04 AM

I use Harbor Freight lifting magnets for counterweights. 

 

150 lb capacity,  2 lbs weight.. $10

 

250 lb capacity 5 lbs weight. $20

 

I wrap them with duct tape to protect the scopes finish.

 

The work nicely with metal tube Dobs and truss Dobs with steel mirror cells.

 

Jon


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#5 airbleeder

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Posted 05 March 2021 - 09:08 AM

  I have a Telrad and a 8x50 RA finder mounted on my 8"f6 sonotube dob with homemade cradle mount. I velcroed steel bars to the tube to balance. No problems.


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#6 eyeoftexas

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Posted 05 March 2021 - 09:37 AM

Telrad plus 10x60mm Stellarvue RACI finder on my 12" Orion.  I use counterweights, but that comes also from using a Paracorr II and heavy 82° AFOV eyepieces.


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#7 Voyager 3

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Posted 05 March 2021 - 09:58 AM

Does the combination of a Rigel/telrad ( I think telrad is heavier ) and a 60mm SV clone with a 20mm ES 68° be too heavy for a Orion 8" ? 

Hi Jon gotta get a ES 20mm as you tested that it can be fitted with cross hairs :-) . Also unfortunately no Harbor Freight in my state so some DIY and metal work would be the way to go but will be in long future as the virus is still not cooled here . 

And everybody pics with your counterweights please so that I can get some idea ! 



#8 eyeoftexas

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Posted 05 March 2021 - 10:20 AM

These work well.  I have several so I can add and subtract them from for balance:

 

http://scopestuff.com/ss_mwt1.htm



#9 astrocanito

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Posted 05 March 2021 - 10:30 AM

Telrad and 8x50 finder.

3 counterweight combo. Bungee cord, magnets and chain.

Chain picture:

 

Fixed counterweight

Edited by astrocanito, 05 March 2021 - 10:30 AM.


#10 sanbai

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Posted 05 March 2021 - 10:58 AM

I thought about adding a finder to the 12.5" dob I have on order. Since I'll have Nexus on it (and the Telrad), I'll pass on adding the extra weight. With my C8 GoTo system, I rarely use the RACI finder, only the Telrad to help with the alignment.

Of course, for those that like starhopping, a finder is a good addition, especially with larger focal lengths. I don't have much observing time, so I prefer to skip the starhopping, except the easy ones.

 

Take also into account that the Telrad is quite good and accurate with its 4 °, 2 ° and 0.5 ° circles. You can play with them to better orient the starhopping process and measure the jumps. My 12.5" will give me 1.55 ° at low power, so the Telrad can put me easily in the ball park (if there are enough stars in that area... which depends on sky quality).

 

My actual wish for a finder would be to observe wider fields, not starhopping. But I'll stick to my 80mm refractor in its own mount. Small binoculars will be my future handier solution. It's a pity that Dobs aren't suitable to add a 80 mm refractor (unless you have a 36" under a dome).


Edited by sanbai, 05 March 2021 - 10:59 AM.


#11 airbleeder

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Posted 05 March 2021 - 01:57 PM

Does the combination of a Rigel/telrad ( I think telrad is heavier ) and a 60mm SV clone with a 20mm ES 68° be too heavy for a Orion 8" ? 

Hi Jon gotta get a ES 20mm as you tested that it can be fitted with cross hairs :-) . Also unfortunately no Harbor Freight in my state so some DIY and metal work would be the way to go but will be in long future as the virus is still not cooled here . 

And everybody pics with your counterweights please so that I can get some idea ! 

    I use ES 34, 24, 16mm 68* and ES 11, 8.8, 6.7 and 4.7mm 82* eyepieces with no problem, but the 16 1/2" alt bearings help with the balance. 



#12 Spile

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Posted 05 March 2021 - 04:46 PM

I have a Telrad and this raci on my 200P Dobsonian...

https://www.firstlig...inderscope.html


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#13 Voyager 3

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Posted 05 March 2021 - 11:18 PM

    I use ES 34, 24, 16mm 68* and ES 11, 8.8, 6.7 and 4.7mm 82* eyepieces with no problem, but the 16 1/2" alt bearings help with the balance. 

Thanks , but I will use that EP in a 60mm finder along with a telrad / Rigel so that's what concerning me .



#14 PJBilotta

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Posted 06 March 2021 - 02:30 AM

It's pretty hard to beat the Rigel and an 8 x 50 finder combo. The Quickfinder is so light compared to the Telrad, that it's the obvious choice if you are concerned about weight.
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#15 airbleeder

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Posted 06 March 2021 - 09:18 AM

Thanks , but I will use that EP in a 60mm finder along with a telrad / Rigel so that's what concerning me .

   Oh, I missed that.


Edited by airbleeder, 06 March 2021 - 09:21 AM.

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#16 Richie2shoes

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Posted 09 March 2021 - 02:31 PM

Telrad, RACI and Green Laser pointer on my AD12.  Each has it's use and I use the harbor freight magnets for counter balance.


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#17 wrvond

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Posted 10 March 2021 - 02:47 PM

I have had the Telrad and RACI finder on my XT10g but currently have the Telrad with Pinty GLP. I switch back and forth according to my needs.

 

Here is the scope. It is currently balanced without the Paracorr or an EP

 

IMG 4281
 
Here is a view of the Telrad and Pinty GLP
 
IMG 4285
 
These are curved ceramic magnets I picked up somewhere. They stay underneath the primary mirror all the time.
 
IMG 4282
 
The heater controller also supplies power to the fan, so it stays in place at all times. Next to it are four felt covered magnets that are moved around to compensate for the Paracorr and EPs.
They are sitting at the pivot point so don't affect balance.
 
IMG 4283
 
On the floor is a Harbor Freight magnet like Jon mentioned. I use it for really big loads.
 
IMG 4284

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#18 rlmxracer

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Posted 10 March 2021 - 03:32 PM

I run a RACI and a Rigel on my 10” dob. The Rigel finders weigh almost nothing so I do have any balance issues. In light polluted skies I only use the Rigel to see where I’m aiming then I use the finder scope to actually star hop. On the occasions I get to dark skies I only use the Rigel finder to star hop because I have found I see too many stars in the visual finder to be very accurate. 




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