What's the tube OD of the Sears 60mm F/11?
Posted 30 May 2007 - 08:02 PM
I'd prefer not to use a lot of shimming or building up to make the tube fit. Does anyone know where I can get a set of rings to mount this tube to a old-style (no dovetail) EQ head?
Thanks and clear skies,
Posted 30 May 2007 - 09:06 PM
If that OTA diameter is the same as some of the other 60mm scopes I have, what I ended up having to use was a clamshell ring from a NexStar 60 (an option which sucks, IMO, but it was all I could find at the time).
I've also used some of my Losmandy three-point rings on a DMM or other attachment method.
SoCal Astro Accessories claims that he will 'produce ring sets of any size for your OTA. All we need is the tube O.D.'. Hopwever, his normally-stocked 80mm rings are a whopping $159! They are excellent quality, machined (not cast). One of my fellow club members has some for his TOA in his imaging setup. If you have several OTAs of that size you want to use on another mount, that MIGHT be the way you want to go, except the expense might scare you off... This is the option I'd probably choose for myself.
There's always Ken's Rings, but I really don't like his quality...
Other than that? A quick Google tells me that no one stocks anything smaller than 76mm, apparently...
Posted 30 May 2007 - 09:12 PM
I don't want to spend the money to get a custom set of rings made, since I have a high turnover rate with scopes. Something I plan to keep for 10 years might end up sold next week, so who knows?
Regards and clear skies,
Posted 30 May 2007 - 09:26 PM
As a suggestion: Why don't we put together a reference of tube diameters for all these different 60mm tubes and see whether or not there is a common tube size? Or two common tube sizes? That way if we turn some of these 60mm scopes over from time to time we will know whether or not a set of rings we buy or have made or whatever will work with another scope... seems reasonable to me.
Posted 30 May 2007 - 09:31 PM
I could possibly modify a set of guidescope rings. How common are 60mm guidescope rings? Are the only "vintage" ones the Unitrons which are pricey?
Posted 30 May 2007 - 09:43 PM
I'll start measuring tubes later and we'll see what we come up with.
Posted 30 May 2007 - 10:42 PM
Here are my contributions (for now):
Unitron 114 60/900: 2.67. I assume all Unitron 60mms are the same.
Swift 60 f/11 blue tube -- made by Towa, originally on an yoke mount but I removed it years ago and put it on a real alz-az mount for my daughter to use. It's actually a very nice scope optically. 2.5"
Tasco 7TE 60/910 - also 2.5"
Tasco 7TE-5 60/1000 - also 2.5"
Tasco 10TE/15TE 76.2/1200 - 3.0"
Tasco 10K 80/1200 -- this will be the same as the Towa 339 and the 80/1200 that Clint just bought -- 3.25"
So, this came as a surprise to me -- I thought the 3.0" rings fit the 10K. I've only had it set up once, but I guess I set it up on its own GEM. It has lived in its box most of the time since I acquired it. I've only found one other Tasco 10K owner -- he's in Europe -- and he raved about his scope. Mine performs quite well, too.
Guess I need to use some of these more often...