Ethos/C8

So....Having been living with the cheap $99 Celestron Plossl eypiece/filter set that I have had for 7 years, I am thinking of taking the plunge and looking into EPs that I will want to hang onto for a while. I also have a pair of WO 20mm Swans that came with a binoviewer.

So how would an 13mm Ethos perform at in a C8 f/10, or at f/6.3. I also have a WO SD66 f/5.9 for my grab and go. My main concern is will I be able to appreciate the wide field of view?

Thanks and clear skies

Is TeleVue making an 11mm Ethos now? I know they make a 10mm, and I own a 13mm.

The Meade 7" MAK has an 8.25 inch mirror and at f-15 its focal length is 2670. Not taking into account the large field of view, the 13mm Ethos performs better than a 12mm Nagler. I get 205x and the field is flat and crisp from edge to edge with good on-axis performance. It also has just a hint more contrast. I had to do lots of looking to compair the two. You might not even see the edges of the field. My old 12 Nagler had been the top of the heap from past experiments with EPs.

The C8 has a shorter focal length, so the 10mm Ethos might be the way to go. You'd get 200x with very enjoyable use.

I'm still considering the plunge for an 8mm Ethos, but want to check out more EPs first.
Clear skys,
Steve

You should be OK with the 10mm or 13mm, but the 17mm is getting to be at the edge of what your c8 will allow through the baffle tube without vignetting.

There are many ways to improve over a celestron set without going to ethos. Options include but not limited to Baader Hyperions, Edmund RKEs (I'm very fond of the 8 and 28mm), and the Pentax XWs (also XLs used). The Edmund RKEs are not wide fields. The Baader Hyperions and Pentax XWs and XLs are. If you've been using a bunch of plossls 68 to 70 degrees is going to be plenty. A 10mm Ethos will be a treat, however.

regards
Greg N

I'm curious, is the field curvature of an SCT a problem with extremely wide fields? Is the outer edge of the Ethos field messy?