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Post by plyscope on May 8, 2011 20:44:40 GMT -5
My 5 inch f12 R30 lens in cell arrived about 3 weeks ago. Unfortunately I was away and only got home yesterday. The lens looks great. It was very well packed and I am looking forward to making a new telescope. It feels heavy though I haven't been able to weigh it. Andy Jackson Attachments:
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Post by plyscope on May 8, 2011 20:45:17 GMT -5
Front view Attachments:
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Post by plyscope on May 8, 2011 20:45:58 GMT -5
Back side Attachments:
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Post by plyscope on May 8, 2011 20:46:39 GMT -5
Coatings look nice. Attachments:
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Post by plyscope on May 8, 2011 20:49:11 GMT -5
Some of the dimensions;
clear aperture 127mm
cell diameter 148mm
Flange diameter 168 mm
flange thickness 9 mm
Cell depth behind flange 9 mm
Andy
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Post by Mike on May 8, 2011 22:24:58 GMT -5
Pictures are great Andy. I never get tired of looking at those cool objectives. Can't wait to see the final product. Please keep us up to date on the progress. I sure won't mind a few more pictures along the way  |
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Post by mikey cee on May 8, 2011 23:08:49 GMT -5
Good ol' Ales.... :oHe's got everything but the size of the "kitchen sink" on that lens cell! ;D ;D ;D Mike
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Post by Mike on May 8, 2011 23:17:04 GMT -5
LOL! Thanks for that Mike. You are right. I thought it but you said it! |
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Post by Watcher3 on May 9, 2011 6:48:45 GMT -5
He forgot to engrave the Strehl rating!  |
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Post by plyscope on May 19, 2011 22:29:29 GMT -5
Today I received the D&G 5"f15 lens that I ordered in Septemeber 2009. Here is pic next to the Istar lens. The D&G comes with a countercell and is coated with magnesium fluoride only as opposed to multicoated. Andy Attachments:
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Post by plyscope on May 19, 2011 22:30:07 GMT -5
Another photo Attachments:
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Post by Watcher3 on May 20, 2011 5:43:14 GMT -5
Looks like you have your hands full! Gonna make the same stile tube for the D&G?
I'm not sure about the single coatings. The images are so much crisper in my single coating Cartons. I don't know if it's due to the coatings or focal length, but comparing them to modern multicoated lenses in my shorter scopes, I get the feeling that a single coating was plenty good enough.
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Post by mikey cee on May 20, 2011 11:32:59 GMT -5
Today I received the D&G 5"f15 lens that I ordered in Septemeber 2009. Here is pic next to the Istar lens. The D&G comes with a countercell and is coated with magnesium fluoride only as opposed to multicoated. Andy Andy just thank God and your lucky stars that you lived long enough to get that D&G lens!!  ::)Mike |
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Post by plyscope on May 20, 2011 17:18:34 GMT -5
Hi Joe
I do intend to make a plywood tube for the D&G. The coatings are nice either way. Simple coatings are good enough. They are important in the smaller sizes to improve light transmission, less important in larger sizes.
Hi Mike
Yes I am glad to see it at last. I bought the Istar lens when my patience for D&G waivered a little. I have no regrets getting both lenses though. It will be fun and interesting to compare them and I wanted to try something from Istar sooner or later.
Andy
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Post by steveg on May 26, 2011 1:38:47 GMT -5
Flange diameter 168 mm Is that the outside turned down part of the cell?
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::)Mike