Mirror Specs

Mark Harry finished up my 8" f4.9 mirror and sent it to the coaters!

He sent me these specs, are they good?

Specs are 1/14th wavefront error PV, .97 Strehl, and average RTA of about .5

Ed

Excited about my scope upgrade - can you tell?

Ed,
Your mirror specs are right there with any you will see on the hill. If there are any better there I would wager that you will not be able to see the difference.
Floyd

Ed, How was the wavefront and strehl measured. Unless it was done via laser interforomentry it not accurate. Even the top mirror makers have a difficult time making 1/6 wave mirrors. Whether 1/16 or 1/4 you probably would know the difference.
Mike

So, Ed, what are you intending to do with this very good mirror?

Bob

Tonight was a total surprise in the that the forecasted clouds opened up and gave us a decent night of viewing. I worked from my yard (not dark) but had the moon to check out, run up the magnification, take some pictures, etc. WOOOOWWWWWWW!!!!!!!

Between the refigured mirror and the Antares secondary, the views are incredible. The CR2 focuser really lets you slide effortlessly into the sweet spot and take advantage of the optics. I had the moon at 500x in an 8" f4.9 scope and was looking to go more.

The weak link turned out to be the mount with a bit of shake at that magnification. I used to use 500x for sliding in and the views were terrible. I had only been above 250x a couple of times because the optics broke down.

Attached is a photo at 444x with a digital camera hand held at the EP. Due to my movement, this shot really doesn't do justice to the view. I have some film to develop that I can post tomorrow - shots up to 250x.

Drool, Drool, Drool, Drool. I love this scope. These views, portability, quick setup, easy storage, .....

Ed

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