[DavidP (David)]

Hi all,

Thanks for all the comments.

I got brave last night and dismantled the diagonal...........to find.............a mirror!......and not a prism as stated in a specification that I found on the net.

Looks like as most have stated a mirror diaginal is more suited to a short focal length refractor.


So my upgrade will be to a Quartz di-electric, probably by GSO due to its price, and unfortunatley not the vernonscope (1/20 lamba) were money no object.


Therefore my kit will comprise 102SLT (refractor), 2inch mirror diagonal, apo 2.4x barlow and zoom lens. Interestingly, because the zoom is not parfocal, I can adjust it to then minimise the chromatic abberation bu choosing that sweet spot between the green and red halos.

Thanks to all for your time to reply,


David