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  #1  
Old 11-07-2018, 04:56 PM
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astronobob (Bob)
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Opinions: Rotating Flex-Dob Shroud 120*

Hi all 'Astro'liano's

I am finding this Flex Tube Dob is quite large - Good 'Light-Bucket'
But the Finder is awkward to reach around zenith - The Base is around 1meter in diameter, if memory serves - 33". Both the Focuser & Finder stand just over 6' when around zenith.
I definitely need a small step to reach them but lunging out another 500mm to get my eye near the Finder is risking a hazard of landing in/on the mirror, haha, or should I admit- I have fell into the scope, well, I managed to straddle around it after gravity failed me, Lol, no damage/consequences - nor embarrassment as I was alone

Some home-made Dobs of this size have had the focuser & Finder attached on or near the bottom of the scope shroud for easier access, makes a lot of sense, and as many know, it a great Idea

So, I am considering Rotating this shroud 120 degrees, as there are 3 trusses placed 120 deg apart'
There is one large bolt on top of each of three trusses holding the shroud to them.

My question is whether this would hamper any collimation factors ?
I would assume all trusses would/should be exactly the same length & all parallel - within reason ?

I guess one can only try it and if ok, great bananas, if not- put it back
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  #2  
Old 11-07-2018, 09:48 PM
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OzEclipse (Joe Cali)
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Bob.

Good point. If you're out observing alone and you have a big fall, knock yourself out. Who will find you? I have similar issues observing up a ladder on a remote site. I exercise extreme caution and minimise the straight up observing when alone. It's worth a try and no harm no foul.

If it doesn't work, you could try : -

1. You can add another finder on the other side if that side is more accessible? You'll also need to add counterweight.

2. Mount a RACI finder down on the rocker box. No counterweight required.

3. Video finder?

4. Add a Nexus or an Argo Navis ? You won't need a finder.

Joe
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Old 11-07-2018, 10:11 PM
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astronobob (Bob)
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Quote:
Originally Posted by OzEclipse View Post
Bob.

Good point. If you're out observing alone and you have a big fall, knock yourself out. Who will find you?
Joe, and I'd get a real good look at my clumsy self

Quote:
Originally Posted by OzEclipse View Post

1. You can add another finder on the other side if that side is more accessible? You'll also need to add counterweight.
Great Idea Wont need to bend upside down for them low'ish targets, two finders, best of both worlds


Quote:
Originally Posted by OzEclipse View Post

4. Add a Nexus or an Argo Navis ? You won't need a finder.

Joe
It does have the Synscan GoTo, but it aint accurate enough when using barlows and high power Ep's, let lone a small chip planet cam I intend to use,,, when they find me, or I somehow get out, might leave a rope in here for next time, just incase

Much appreciated Joe
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  #4  
Old Today, 07:58 PM
geolindon (Lindon)
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Location: Moore Park Beach, Qld. Australia
Posts: 269
g day Bob,

i have a similar problem and am thinking a right angle finder . . . . wotcha reckon?

L
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