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Struve 1825

 
Edited

This is a pretty double, easy to find because it's next to Arcturus. I dragged out my old TMB 100/800 4" f/8 refractor, made by the late Thomas M. Back.

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Struve 1825

4.4"

This lovely pair are only 1¡ã from Arcturus. The 6.4 magnitude primary is orange, and the tiny 8.4 magnitude secondary is blue. I haven¡¯t used the TMB 100/800 in a long time. Wow the optics are simply wonderful. I saw equal to fraction rings on both sides of focus. Absolutely no difference.

IMG_5885.jpeg

 

Yes the TMB scope is one of the best objectives ever made, LOMO optics form Russia. It was a unique design with glass that is unobtanium now.

Thomas Back passed from the scene way too early. His optics were top of the line. Your TMB80 is probably the best optics I've seen. I was lucky to have owned one of his scopes and was fortunate enough to have used, once, an 8 inch TMB refractor. It took three of us to get it on the mount if I remember correctly. Wish I had more time on that one.

The 4 inch is in many ways an ideal size for a refractor. Capable of serious work but does not require a semi truck to move. It does it all mostly. 3 inch are fun. Five and above is getting big so the 4 is a nice perfect size.

On Sunday, May 4, 2025 at 06:34:20 AM EDT, Kent Blackwell via groups.io <kent@...> wrote:


This is a pretty double, easy to find because it's next to Arcturus. I dragged out my old TMB 100/800 4" f/8 refractor, made by the late. Thomas M. Back.

?

Struve 1825

4.4"

This lovely pair are only 1¡ã from Arcturus. The 6.4 magnitude primary is orange and the tiny magnitude secondary is 8.4. I haven¡¯t used the TMV 100/800 in a long time. Wow the optics are simply wonderful. I saw equal to fraction rings on both sides of focus. Absolutely no difference.
 

The TMB 100/800 is unique, indeed. Not only does the dew cap retract but also the focus tube completely collapses inside the main tube. This rather long extension tube can be collapsed, allowing use of binocular eyepieces but more importantly it fits in a case suitable for airline carryon travel. Unfortunately, the telescope is rather heavy.

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