800mm focal length refractor

[Merlin66 (Ken)]

Andrew,
Thanks but more than I’m prepared to pay.

[gbeal]

If you can live with just 63mm, a Telementor is 840mm. I use mine with a Quark occasionally, and years ago all the time with an SM60,
.

[Merlin66 (Ken)]

It’s for use with a MiniSHG for solar imaging. I need the aperture for increased resolution and the focal length to match the slit gap height.

[Eldest_Sibling (Alan)]

Originally Posted by Merlin66

A 120mm with a focal length of 900mm (not necessarily an ED version) would be ideal.

That would be this one... http://www.saxonoptics.com/products/...roductid=10201

Synta also offers a 120mm achromat, under the "Celestron" marque, and "Saxon", but at f/8.3; 1000mm.

https://groups.io/g/astronomicalspec...20%2C2%2C0%2C0

[Merlin66 (Ken)]

Alan,
The ED refractors are overkill and seem to be very expensive.
I’ve found a 120mm SW achromat 1000mm fl for trials……
Stay tuned.