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Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #193509

For Sale: 125mm f15 achromat objective and 3" zerodur flat

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I'm crazy, but I would like to try an off axis newt project.

Thus I need to sell my excellent 125mm f15 achromat objective. Made by a master optician for his own personal use. The documentation with it says it is 0.08 peak to valley wave error and 0.014 RMS. It does not have coatings (the images are very slightly dimmer than a coated 125mm would be). The housing is a solid aluminum case with three holes for mounting (no collimation mechanism).

The 3" zerodur flat is from Oriel Optical and is rated at 1/20 PV. I have painted the outer uncoated beveled edge to reduce stray reflections.

I would like to sell these together to someone seeking to do a folded refractor project. These together produce excellent images--very sharp and contrasty. I've seen the companion to Propus in Gemini with this scope! Yes, there is a little color on Jupiter but it is very subtle; there is a slight color cast on very bright stars like Castor (very slight yellow green in focus). Defraction rings same one either side of focus (with color of course). "False color" is nothing compared to faster achromats I've looked through. The previous owner of the objective (highly rated Astromart seller) compared it quite favorably with a 6" f20 D&G objective he owned. Very flat field of view with this scope!

I have a firm price of $900 plus shipping for both optics ($500 for the objective and $400 for the flat). If can not sell at these prices, I will hold on to it...

Sorry, no digital picture capability.

Thanks for looking.

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