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Scooot

Sumerian Canopus 16" review

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Having the same for mine, shame they don't do them in televue green though? I may ask?

Damian

Asked Starlight and they don't do Green  :sad:  Not had any demand for them in that colour. Hey ho looks like it's going to be one in another colour for me 

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Hi Richard

I'm sure you'll be able to replace the screws for counter sunk ones. They're probably imperial like most of the American stuff.

Nick that's a decent price wonder why he's selling it? Looks a good buy

Thanks Mapstar, just fixed it. It turns out the thread near the bottom of the insert is narrower so the supplied starlight bolts fit. I had to drill the holes slightly deeper but all is now nice and secure as designed.

The grub screw holes are visible in this pic.

post-20507-0-47870300-1422198962_thumb.j

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Nice one - yes I see them now on either side wall of the mounting plate! Thanks again :)

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I remember drooling over the reports on that scope on SGL (if it is the same one) - seems like an excellent deal - a smidgen too late for me -- would certainly be tempted at that price. Best regards to the seller...

yes its mike 73 of here great guy, and lovely scope

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Update

I've used it a few times now so for the sake of completeness I thought I'd add this.

Using my 26mm Nagler and Paracorr I've had a very tiny balance issue when pointing the scope near the horizon. Not that I do this often. A slight touch might make it drift down slightly or I might have to carefully let go once I've positioned it. I presume it's because the Teflon altitude pads have become a little smoother with use?

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Hi Scooot,

Did you apply any armor all or anything like that to the bearing surfaces? I see it recommended for some dob manufacturers but wonder about too little stiction. What you say re pad surfaces 'bedding in' a little sounds reasonable...

Also - just out of interest - have you any thoughts on how noticeable a difference a Paracorr makes to you at say low / med / hi powers - have you experimented? Your 16" mirror is f/4.5 isn't it?

Hope we all get some DSO hunting weather when the moon wanes ;)

Cheers Niall

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Update

I've used it a few times now so for the sake of completeness I thought I'd add this.

Using my 26mm Nagler and Paracorr I've had a very tiny balance issue when pointing the scope near the horizon. Not that I do this often. A slight touch might make it drift down slightly or I might have to carefully let go once I've positioned it. I presume it's because the Teflon altitude pads have become a little smoother with use?

Just realised I could be being a bit dense here

I've just been reading about balancing truss Dobs and I came across an article about using a spring system, a bit like the elasticated rope on the above pic. I'd previously presumed this is a transport

tensioner but now wonder whether it's designed to help balance the scope at the horizon if required? I'll update when I've had a chance to try it

.post-20507-0-41961300-1423171719.jpg

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Hi Scooot,

Did you apply any armor all or anything like that to the bearing surfaces? I see it recommended for some dob manufacturers but wonder about too little stiction. What you say re pad surfaces 'bedding in' a little sounds reasonable...

Also - just out of interest - have you any thoughts on how noticeable a difference a Paracorr makes to you at say low / med / hi powers - have you experimented? Your 16" mirror is f/4.5 isn't it?

Hope we all get some DSO hunting weather when the moon wanes ;)

Cheers Niall

Hi Niall

I was just typing that whilst you posted it.

I used the paracorr with my F4.8 OO scope as well and I only noticed coma with the nagler but used it with all the eyepieces.

When I set this one up the second time I forgot the paracorr and didn't even notice with the 17.3mm or 10mm until afterwards. In fact the lesser mag without it on M42 was probably a help that evening, I had amazing views of the nebula and trapezium seeing the e & f stars fairly easily. I haven't tried the nagler yet without the paracorr but I think I will next time out so I'll let you know.

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Thanks!

Yes - I do believe that is a tension based counter balance scheme - I think the Alkaid models feature that approach, and also now the new revision of the canopus. I hadn't seen it on the older version as far as I recall.

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Thanks!

Yes - I do believe that is a tension based counter balance scheme - I think the Alkaid models feature that approach, and also now the new revision of the canopus. I hadn't seen it on the older version as far as I recall.

Many thanks, that's great to know. pity there was no mention of it in the instructions, but pleasing to know it's there to use if necessary. :)

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Richard

I used my 31mm T5 in a buddies Canopus 16" without any issues a while back. Sounds like you need to have a gander at the tensioner system. His scope had no problems dealing with the enormous fat lump (the eyepiece not me :D )

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This is precisely the type of scope (with an OO mirror) that I want as a companion for the Pentax whilst it's APing.. I'm very tempted to build my own in the same format. Then stage two would be to make a middle cage and then have two 24V direct drive motors provide an alt-az tracking.

Edited by NickK

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This is precisely the type of scope (with an OO mirror) that I want as a companion for the Pentax whilst it's APing.. I'm very tempted to build my own in the same format. Then stage two would be to make a middle cage and then have two 24V direct drive motors provide an alt-az tracking.

If you do let me know if you want any pics of anything else.

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Hi Richard

You can loop the tensioning cord various ways to get the required 'balance'.

It works on my Alkaid with the 31 Nag/Paracorr combo.

Cheers

Paul

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