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Classic mount with modern refractor

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#1 Sasa

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Posted 12 September 2013 - 03:00 PM

Hello,

I can now mount my Sky Watcher 100mm ED to Zeiss T-Mount which originally came with Telementor (click on image to get large version):

Posted Image

Need to check it under the stars yet. But it should work, 100ED has the focus only 6cm longer. And the weight of the tube is just a little bit over the Telementor's tube. It can still be balanced with one conterweight. I do not know why, but ED100 seems to be much bigger than Telementor although the measures are almost the same.

Should be a sweet combo, I can still easily lift the setup and navigate through the doors to my backyard. And ED100 reaches just one magnitude deeper than Telementor. It counts from light polluted site as is my backyard.

BTW, do you know why Zeiss picked up a diameter of 63mm for their Telementor lens? The only thing that came to my mind is that it reaches exactly one magnitude less than 100mm telescope. The ratio of lens areas is 2.52, and the difference in light intensity for two stars one magnitude apart is 2.51. Could this be a reason for 63mm diameter? Or is it just 2.5in size (63.5mm)?

#2 Mike E.

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Posted 12 September 2013 - 03:31 PM

Nice! :cool:

Having recently acquired a TM-Mount, I now have a spare T-Mount. As the Zeiss GEM also works great in alt/az mode, I would like to use it for our Intes Micro 127mm mak, and also a 60mm Carton refractor we have.
It's difficult to find the right size dovetail to use with the T-Mount here in the UK. I understand Astro Physics used one of a similar size for their Traveler Scope, which is no longer made. Did you have a special dovetail made to use with the Skywatcher rings ?

#3 Sasa

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Posted 12 September 2013 - 04:04 PM

Hi Mike,

yes, this is a special dovetail plate. My brother made it for me. Normally, I'm using ED100 on AZ5 alt-az mount but I started to like Telementor with its equatorial mount more and more, so I wanted to have an option to use it with my larger scope. What I like on Telementor is that with simple 1 minute mount alignment I can effectively use the declination setting circle to find the targets (first, I use water-level to level the mount, then I just set the declination of Arcturus, +19deg, and I move the mount in RA and around the main pole in such a way that Antares is in the middle of the FOV).

When I'm looking for an object, I just set its declination and then I just roughly point the telescope to it. I can usually very quickly identify the star field using Uranometria 2000.0. This works very well for me in light polluted sky even without finder.

Alexander

#4 Don Taylor

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Posted 12 September 2013 - 10:17 PM

sounds good to me! I do the opposite and put a (near) classic telescope on a modern mount: (A-P Achro guidescope ~Nihon-Seiko 1987 on a recent Vixen GP2+HAL130)

#5 nightfisher

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Posted 13 September 2013 - 01:15 AM

I have done this other way round, swift 839 OTA on modern supa track mount

#6 Sasa

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Posted 13 September 2013 - 04:36 AM

Have it the other way around as well. My AS110 is riding on Losmandy G8 in my observatory: http://www-hep2.fzu...._firstnight.jpg

Since last summer I was left at home with only alt-az option for my larger refractors. Now I can run ED100 on equatorial mount again. I think it will be a great help for the upcoming Jupiter season. It really helps when you need to touch the mount just in one direction during making a sketch.

#7 terraclarke

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Posted 13 September 2013 - 08:30 AM

I have recently done the same thing and bought a set of rings and a rail for my Sears 6344 3inch F16 so that I can put it on my Vixen Porta II mount with wooden legs. It's a great grab and go combination and looks good too.

#8 amicus sidera

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Posted 13 September 2013 - 09:09 AM

I recently acquired a Celestron 102GT refractor (one of the tube assemblies that OPT was selling for $60), and placed it on an extended pier mount with an old Edmund equatorial head. Works great.

Fred

#9 amicus sidera

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Posted 16 September 2013 - 01:19 PM

Here's a photo of the combination new scope/old mount... the 102GT now sports Edmund colors, and the 1970's Edmund GE mount rides on a custom 5' extended pier for ease of use while standing:

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#10 amicus sidera

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Posted 16 September 2013 - 01:20 PM

Another view:

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#11 amicus sidera

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Posted 16 September 2013 - 01:21 PM

Looking skyward:

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#12 amicus sidera

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Posted 16 September 2013 - 01:22 PM

The Magic of Krylon...I like it:

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#13 greju

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Posted 16 September 2013 - 01:24 PM

Nice "Edmundesque" paint job!

#14 Sasa

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Posted 16 September 2013 - 02:22 PM

Very nice setup up. Indeed. I like to color as well.

BTW, I just had quick look on Moon yesterday. The weather was bad, haze around Moon, clouds, and it was clear that it will be just worse with time.

Still the view through ED100 with TMB16+TV2.5x (141x) was very nice. The combo is usable but little bit shaky. Luckily, the OTA is equipped with dual speed Crayford and I can focus with just light touch. Otherwise I would not be probably able to focus properly at all. Although the scope is just a little bit longer and heavier than Telementor's OTA, the difference is unfortunately quite large.

#15 rdandrea

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Posted 16 September 2013 - 02:38 PM

Nice work. But with the extra leverage of that extended pier, I'd be sandbagging the legs.

#16 amicus sidera

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Posted 16 September 2013 - 03:16 PM

Thanks, guys! I initially thought that I'd need sandbags too, Ralph, but it's actually quite steady, given it's height... a set of anti-vibration pads takes care of what little shakiness there is, and the image settles down in a couple is seconds at most. I may eventually shorten the pier by a half a foot or so, but it's nice to be able to view while standing, and to be able to get under the scope without too much neck-twisting.

Fred

#17 terraclarke

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Posted 16 September 2013 - 03:57 PM

Looks great Fred. Perfect paint job. It looks very sporty!

#18 amicus sidera

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Posted 16 September 2013 - 04:06 PM

Thanks, Terra! That red-and-tan combination just makes me happy... :whee:

Fred

#19 SpaceNetworks

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Posted 16 September 2013 - 04:12 PM

Inspired idea, nice execution, looks great! Coolest Celestron 102GT I think I've seen. Congratulations.

#20 terraclarke

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Posted 22 September 2013 - 03:46 PM

Here's a classic scope on a modern mount. My Sears 6344 on my Omni CG-4 GEM. Sometimes its fun to have the scope driven, in which case I take it off of its native GEM and put it on this one. Such was the case today for a little solar viewing with the Lunt solar wedge.

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#21 amicus sidera

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Posted 23 September 2013 - 03:14 PM

Very fine indeed, Terra! That looks like quite a pleasant combination, and the CG-4 should handle that scope with no shakes at all.

Fred

#22 terraclarke

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Posted 23 September 2013 - 05:22 PM

Thanks Fred. It does handle the OTA very well; a very stable combo.






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