hi ED I was reading on cloudynights you were saying that using a coma corrector and a hyperbolic primary you would get a better image . How much better image...
Kevin, A 26 inch is quite a project! Yes a coma corrector will introduce some spherical which can be improved by overcorrecting the primary. One thing to keep...
hi ED thanks for this group just wondering if your CHIEF telescope uses a flat secondary i have a 10 f 8 mirror collecting dust and thought it might work ....
You know I thought the CHief couldn't be any faster than F/7 but newver really tried it. It just tried F/6 on an 8 inch and got a Strehl of .979. Wow!...
... hi ED does each different chief use the same corecting lens only the spacing is different or does each need a diferent lens. also do you keep the...
Kevin, Yes the secondary needs to be as far as possible to keep the primary tilt small but the correctors want to be as far from focus as possible. So there...
The mirror is f/7 and the EFL is f/6.8 with 2 lenses. It's working good tonight but I've already decided to redo the lower box to make it easier to use. The...
hi is the lens before the secondary? also could part of a 20in f 5.25 be used to make a CHIEF? it works good onaxis// just wondering/ thanks for shareing your ...
... No the secondary is before the lenses, it's just like the layout of the 4 inch in my files only bigger. A 20 inch f/5.25 is too fast to be made into a...
hi ed how do the images compare in your 12 in onaxis to offaxis? also is the columation much harder.i have a 12 in f7.2 that needs finished corecting would...
Kevin, I'll post a spot diagram of the 12 inch CHief and the same mirror as a Newtonian. The only difference is that there a little lateral color from the...
hi ed would fluorite glass be better than bk7 for chief corrector i may have a piece 5 3/4 in by 1 7/8 in just wondering? also i have a piece of flint index of...
... Kevin, I've let Zemax do some glass substitutions on the CHief and it really doesn't do much until you get under F/6 and fluorite glass I think had some...
thanks the heavy flint i was hoping for a refractor it ta 9.25in by 1 5/8 thick i have plans for a 8 in but it uses a diferent flint ... From: Ed Jones...
hi thanks for ihe info can you use a secondary that is round or square insted of a normal secondary i see the surplushed has a lot of flats that are round and...
Kevin, You can uses either round or square as long as they are flat. You might want to bevel one edge back 12 degrees to avoid vignetting. Also the tilt angle...
Hello, This weekend at Stellafane I had an opportunity to take a close look at Ed Jones' 12" f7 CHiefspeigler (hope I have the specs correct) and also to get...
Hi Gary, I had a lot of interest in my scope, a lot of folks had no idea of how it worked. I didn't see the point of entering it into their competition, I...
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