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I agree, difficult to see if they are spots, tree sap, or what on the mirror. I clean mine once a year following Dave’s instructions, using 2 gallons of distilled water. Add one drop of plain old

Yeah, I tried that but it did not remove whatever it is.

Pore distilled water at a 45° angle if there's any droplets just soak them off gently by touching the tip of a paper towel to soak them up.

It is hard to tell from the pictures if it is water spots from dew or or general haze. If a general haze it from the mirror coatingj slowly degrading. They do that and you just clean your mirror once

So, quick question.? I have the exact same look on my primary mirror.? Did you wash it a few times and always dry it with a micro-fiber cloth ?? Just wondering the best way to get it off and not

Please find attached some pics of my primary out of my 15" F/4.5 Obsession.? Please let me know your thoughts.? I know it is not dust. Thanks guys..

We agree to disagree. Its garbage IMO. For 15K? The mechanics are garbage. For $15K? The VMB is weak. For 15K? The side to side causes issues.?For $15K? The alt cable needs to be perfect (and I have

Hi Mark, to start with I own a classic 15 and a UC22 the real #1 UC22 both with AN/SC. To make a long story short, the classic 15 was my first step to large aperture moving from a meade LX200 8'. It

The mechanical issues with the UC22, especially the so-called virtual rocker/mirroe box are unforgivable. It slides side to side pulling out the nailed in furniture glides. Yes, 15k and you get f'in

Thank you. wrote:

What I did was to get longer thumb-bolts and take about ?” of thread off of them. Round then slightly on the end. Makes it easy for them find the holes and make it tough to cross thread. I stole

bobrose500 What assembly bolts did you change to? Chris

I have had a UC22 since 2010 and have no real issues with it. Any collimations issues I have had were self-inflicted. Example: I recently attended the OKieTex Star Party. 1st observable night, Set, up

I've logged hundreds of hours and seen thousands of objects with the UC18 since I purchased it from Dave Krieg in 2009 and have been very happy with it. ?I use it in "push to" mode with the Argo

Collimation was never an issue with my UC-22. It was the implementation of the drive and lousy engineering and build quality.It works now, mostly, but for $15k I did not expect a darn ATM project. And

It's been a while since I used my 18UC.? I've developed an interest in video astronomy, where the camera is connected to an 8" scope which reveals a live image of the object on a laptop screen to be

Our Club owns the Obsession 18" UC... great scope, but not on a windy night...it gets pushed around by the wind. Greg W wrote:

;I have the 15 UC and am happy with it. I do not have any of the electronics on it. It is a bit of a pain to set up but I am 5'5" so one more inch would make a difference. It is great for straight

Searching through various forums over the last few months, in seems to come down to the 3/6 pole design versus 4/8 pole design. ?More attachment points might be leading to a more rigid design. ? The

I went to the Web site today and it appears that classics up to 20" are still for sale there. Is this an error? Does the Obsession Web site not reflect (no pun intended) current reality? Chas. (Still