Maksutov Cassegrain 1000mm lens (200€)

Started Apr 20, 2005 | Discussions thread
Kasper71 New Member • Posts: 7
Re: Modify an old MTO 1000mm f10,0 to a 920mm f7,4 !!!!!/ Mirror lens is not bad!
1

tomfz10 wrote:

http://www.teleskop-service.de/AstroTS/Russentonne/russentonne.htm
Just Eur 200 there!

And kind of areview here: http://www.its-network.de/mto1000.htm and here http://www.teleskop-service.de/Test/Teleskope/MTO1000/mto1000test.htm

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If you want to have a tele lens that is not f10,0 and almost 1000mm, you can buy an old MTO (russentonne) 1000mm f10,0 and adjust it to a 920mm f7,4.

F10,0 is not ideal, so this is a sollution for the photographer who has not the money for a 600mm f4,0 witch a 1,4 or 1,7 tele convertor.

This adjustment gives a boost at :

Sharpness, brightness, and the colors are more realistic.

If the "f" nuber drops , you can use lower ISO and results in lower noise, more shutter speed.

The adjustment is done by :

1) Removing the two lenses in the tube.

2) moving the rear mirror bij moving the rear mirror housing 9,5mm.

Very high image quality for a very low price !!!!

see for your self  :

http://www.flickr.com/photos/100851743@N02/

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