Tristan McMannis Modified Orion Skyquest XT8 w/ Parks Primary Apertura AD12 w/ Waite Research Mirror Celestron 15x70 Binos & Bushnell 10x50 Binos
Meade 12.5" F/6 Research Grade
1971 Criterion RV-6
Orion Observer 70mm Refractor
Homemade 4" f/12 reflector (being rebuilt)
Quote:All that matters is the inside focus.
XT10 classic with premium optics Tri-knob CR2 focuserCatseye + Glatter collimation toolsStarBlast 4.5" & 6"Round Table PlatformTV EPs
12.5" Home built F-4.8 Eq Newt. Lightholder Optics mirror 12'x12' roll-off roof observatory 6" Home built f-6 Newt. w/Dick Wessling mirror on CG-5 Eq. mount. 4.5" Orion Starblast My equipment philosophy... If it ain't broke, fix it anyway.
Quote:Quote:All that matters is the inside focus. Where are the basis of your claim? Both sides matter as much.To the OP, if your scope and mirrors are cooled down properly then most likely your primary mirror is overcorrected or/and have a TDE. TDE sounds like a good possibility based on your description.Didn't you refigure your mirror recently? Was it this mirror or another?Jason
Quote:Hi Paul. when you say tested, do you mean interferometry? If so, do you know of anyone in the southeast who provides this service?
Joined June 2012: Location, Ottawa, Ontario
Mes télescopes et jumelles:
150mm F5 Newt on EQ5, 127mm Mak Cass on AZ4
Oberwerk BT70-45 and 15X70 SkyMasters
-DannyMy warehouseMy Channel
Quote:I've got enhanced coatings in my 8" and its as perfect as when it was standard coatings. There isn't an issue here at all.Pete
Quote:OK, I finally got in to view it. Does make me wonder...I did not see a description of what was going on, but the image entitled tricolor is showing a similar purplish hue to what I've seen on my mirror from an angle at the edges. The hue is not visible straight on, but is visible at an angle. I believe the coatings that were applied are standard and not enhanced. Thanks again for posting the link.
Quote:You know, thinking about it now, I wonder if the cell is to blame...the cell is the standard GSO 9-point cell. It seems to me I could test this by inserting a rigid plate of some kind between the mirror and the cell and see if the test improves. The idea being if the load is transferred uniformly to the plate instead of to the points of the mirror cell it would be better supported...maybe this is not the case, but as I think about it starts to make a little sense. If the cell isnt providing adequate edge support, I think it could cause the kind of results I am seeing. Does anyone else have any experience with a mirror cell causing issues with a mirror's figure?
SyedTeeter STS 11 f/4.3 Zambuto | XT8i | XT8g | XLT 150 | C90 | EON 80mmAT Voyager and Nexstar SLT mountsEyepieces: Mostly TeleVue and PentaxDenk II BV'er, Earthwin PFS-SE, Pentax 10x50 PCF WP II
Quote:Quote:I've got enhanced coatings in my 8" and its as perfect as when it was standard coatings. There isn't an issue here at all.Pete Enhanced coatings are fine. I'm sure yours is. They are just more inclined to produce a clunker every great once in awhile. They have more layers then a standard coating.