Very unusual Tasco Terrastro 50/600
Posted 02 April 2013 - 09:50 AM
Posted 02 April 2013 - 10:55 AM
Posted 02 April 2013 - 12:13 PM
Posted 02 April 2013 - 12:32 PM
Posted 07 April 2013 - 02:21 PM
Posted 06 August 2013 - 12:31 PM
Posted 06 August 2013 - 01:19 PM
Posted 06 August 2013 - 03:32 PM
Posted 06 August 2013 - 03:47 PM
Too bad the folks who put the instruction sheet together couldn't get it mounted properly for a photo. Oh well live and never learn. Mike
Same people must have assembled the objective as well.
Posted 06 August 2013 - 04:06 PM
Posted 23 August 2013 - 12:41 AM
Mine arrived yesterday (eBay high bid) With it came thunder and lightning, clouds and rain. Always a good sign!
Here she is with my recently stripped of bad coatings Swift 839 on a Tasco 7te-5 mount... clouds and rain, lightning and thunder...
Posted 23 August 2013 - 06:43 AM
Posted 25 August 2013 - 02:47 PM
I later used mine as a piggyback guidescope on a larger 3" refractor. It served well and was eventually replaced by a 50mm early Asahi-Pentax refractor - one of the few small scopes of that period that could beat the little Tasco's optics.
Best regards and clear dark skies,
Posted 25 August 2013 - 03:41 PM
Posted 29 August 2013 - 05:09 PM
Here are a couple of pics of my old Tasco of similar vintage.
I haven't looked at these in many years, so this will be a trip down memory lane. New relevant information might be revealed.
Ok, new info already. Scratch what I said about Mizar. I was completely wrong!
It was Towa, not Mizar that I was thinking of.
Posted 29 August 2013 - 05:11 PM
Posted 29 August 2013 - 05:20 PM
Notice, it had the same Alt-Az mounting brackets as your 50mm Terrestrial-Astro tube. I removed those, covered the holes and repainted the tube. I mounted it on a small EQ using a clamshell.
The top two scopes were junkers. Later Taiwan and China-made scopes with dubious optics and lots of plastic parts. The top one was branded "Simmons" and the second one from the top was branded "Meade Polaris". The third, green, scope is a vintage Sears 60mm that had really good optics and few plastic parts. That one ended up with another CN member. I don't recall where the others are now.
Posted 29 August 2013 - 05:22 PM
Posted 29 August 2013 - 05:26 PM
Posted 29 August 2013 - 06:09 PM
Posted 30 August 2013 - 11:40 AM
The best part about that mount is the 60mm clamshell. It's easy to mount onto a Vixen dovetail and use it on many other mounts. Now if I could just find one just like it that fits a 50mm scope...
I had this same problem because I also owned a few 50mm scopes that I was particularly fond of, especially the Asahi-Pentax (which you also see branded as "Jupiter" occasionally). I wanted to use it with my old Japanese GEM mounts, but couldn't find a ready-made solution to fit the configuration. I found two ways to work around this :
1) simply put a shim the inside of the OTA into the clamshell. You can make a rubber o-ring to build up the diameter of the tube and put that around the tube and then clamp the clamshell around the entire thing. This works, but might have a little play in it.
2) Or, scrap the idea of a clamshell and put generic 50mm split rings (the Scope Stuff used to sell for super-finders) on a Vixen-compatible accessory bar. I'm not sure if Scope Stuff still sells those - this was many years ago.
See this photo. It shows a similar arrangement of split rings, accessory bar, and Vixen SP mount. If there is any play in the diameter of the split rings, just use shims to snug-up the difference.
Posted 30 August 2013 - 11:47 AM
The piggyback Pentax tube is mounted to the larger Vixen via a generic Vixen-compatible accessory bar and 60mm superfinder split-rings with nylon adjustment bolts. Once I had the 50mm Pentax tube centered and locked into the split finder-rings, I'd leave it there and just use the generic accessory bar as an adhoc dovetail. I could mount it directly to the SP mount head without using the larger Vixen scope underneath it, if needed.
Total cost wasn't much either. There are 50mm vintage clamshells of the same type, from the same period. But they are a little harder to find, because most smaller tubes like that were mounted onto Alt-Az mounts, and the brackets mounted onto the sides of the OTA were more popular (and cheaper to make) than the clamshell arrangement.
Best regards and clear skies,
Posted 04 September 2013 - 10:43 PM
I have a few 50 mm scopes. A Swift 838 which is fine to crazy good and the others. The others mostly came on tabletop tripods and optically have been surprisingly poor quality. The older scopes are quite well made mechanically. very heavy OTA construction... and will fit the Tasco yoke quite well. Except the Sears which is of a much more recent vintage and doesn't conform hardwarily.
Only one objective stands out as pretty darn good. Anyone wanna guess which scope it is attached to?
Posted 05 September 2013 - 09:15 AM
Posted 05 September 2013 - 09:24 AM