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O.W.L. 6" f/5.875 mirror.

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#1 ngc2289

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Posted 13 October 2012 - 01:27 PM

Well yesterday I bought a 6" f/5.875 mirror with semi-enhanced coating from O.W.L.. Some of the other stats. are P-V 1/14, and a Strehl of .98. I am the OTA only. I am going to use an 8" OD concrete form for the tube. I have an old 1 1/4" RP focuser that has been laying around the house for the last 8 years that I will use, and I ordered a Antares 1.52" 1/18 wave diagonal. I plan on getting a 1800Destiny three curved vane diagonal. I am going to try, and build the mirror mount myself. I will make the mirror mount using 1/2" Baltic Birch plywood, 1/4-20 carriage bolts, Compression springs rated for 10.68 pound, and some 1/4" wing nuts. Well that about covers it. :waytogo:

#2 Shane LaPierre

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Posted 13 October 2012 - 06:41 PM

Enjoy. Always fun making a new one.

#3 Pinbout

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Posted 13 October 2012 - 06:53 PM

you should do yourself a favor and not skimp on the focuser. It will make all the difference. a one speed moonlite would do just fine.

That will be one awesome scope.

you could always do a Mark Harry knock-off

#4 ngc2289

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Posted 13 October 2012 - 08:08 PM

I have not built a scope since 1989. I use to grind my own mirrors, but after 8 mirrors I got burned out. I did enjoy the tube assembly part a great deal though! Yeah I love Moonlite focusers, but I just don't have the money. Maybe I will sell some extra gear, and use the money from that to finance a new focuser. :thinking:

#5 ngc2289

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Posted 13 October 2012 - 08:21 PM

I already have a mount I am going to put the scope on. I recently purchased a UA Unistar HD, and will put the 6" on the that. :waytogo: :ubetcha:

#6 daveingu

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Posted 13 October 2012 - 09:05 PM

Have a look at Gary Seronik's telescope making website, he has plans for a mirror cell and curved spider.that could save you some dough for a focuser. I have built both and been very happy with the results.
Dave

#7 ngc2289

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Posted 13 October 2012 - 09:26 PM

Thank you for reminding me! I have Gary Seronik"s website bookmarked. I will give it a look. Thank you again!

#8 ngc2289

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Posted 14 October 2012 - 02:10 AM

Well I went ahead, and ordered a Moonlite focuser anyway. I will figure out how to pay for it later. :money: :money: :money: :money: :looney: :looney: :looney: :looney: :shrug: :shrug: :shrug: :shrug:

#9 Mark Harry

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Posted 14 October 2012 - 06:46 AM

Mike:
"...after 8 mirrors, I got burned out...."

Guess I'm -REALLY- fried!
**********
I think you're going to like a 6" F/6~. Don't see them too often- kinda under-rated, imo.
M.

#10 Pinbout

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Posted 14 October 2012 - 08:16 AM

how about your rings

I made these rings after dick parker's rings, but I cut all my notches on a tablesaw.

#11 EyeSage

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Posted 14 October 2012 - 10:20 AM

The beauty of a project like this is that if you're unhappy with some part of the design you're not stuck with it. When my home built 6" was due for a re-coat last spring I decided few other improvements to the rest of the scope were in order. By the time I finished the optics were the only original parts that remained.

#12 ShaulaB

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Posted 14 October 2012 - 07:52 PM

Is your OWL mirror coated with silver or aluminum? I need to get my Dob mirror re-coated and wondered if you have an opinion about O.W.L. and their services. And I am new around here, and I could not figure out how to start a thread, sorry :-)

#13 ngc2289

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Posted 14 October 2012 - 08:31 PM

The mirror hasn't been delivered yet. I ordered their semi-enhanced coating which is I believe an aluminium coating. When the mirror shows up I will be able to comment on the quality.

#14 ngc2289

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Posted 17 October 2012 - 09:55 PM

The mirror is on the way, and should be delivered this Friday. The tube is on the way as well. I changed my mind, and purchased a Protostar Blacklite tube instead of the concrete forming tube. Thats all for now.

#15 ngc2289

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Posted 19 October 2012 - 11:47 PM

The mirror showed up today. Attached is a picture of the certificate that came with the mirror. :)

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#16 Mark Harry

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Posted 20 October 2012 - 06:56 AM

Never thought of a blacklight tube. Ought to make a heck of a scope!
M.

#17 ngc2289

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Posted 26 October 2012 - 10:59 AM

Here is a picture of the mirror.

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#18 ngc2289

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Posted 26 October 2012 - 11:03 AM

I am still waiting for the tube to show up. Ordered the tube on Oct. 15th but so far it is a no show.

#19 ngc2289

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Posted 26 October 2012 - 06:37 PM

I just received notice that the tube shipped today, and will arrive sometime next week. Also here is a picture of the mirror in my home made mirror mount.

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#20 Mark Harry

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Posted 27 October 2012 - 06:01 AM

Don't you want the bottom annular disc to go out past the edge clip angle brackets?
M.

#21 magic612

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Posted 27 October 2012 - 09:08 AM

Mike, all looks nice. I just got my 6" f/10.9 mirror back from OWL, refigured and coated with semi-enhanced as well. I'm in the process of putting together a temporary tube so I can test it. Eventually I'll build an aluminum tube for it.

I like your mirror's focal length. I have a 6" f/5 that is my "main" telescope, and sometimes I wish it was just a bit longer in the focal length department, around that f/6-ish that yours is.

#22 ngc2289

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Posted 27 October 2012 - 11:18 AM

I will use long screws to make up for the bottom disc being small. This mirror mount design is like the adjustable size mirror mounts that fit more then one ID size. If my idea does not work I will make another disc.

#23 ngc2289

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Posted 02 November 2012 - 05:09 PM

Well Bryan of Protostar said he mailed the tube last Friday by Parcel Post. The tube still has not shown up after a week. When I checked the Post Office web site it said that the package should take 4 business days. Four business days was yesterday. So your guess is as good as mine on when the tube will show up! The waiting is really tough!!!!!!!!!!!!! :bigshock: :bigshock: :bigshock: :bigshock: :bigshock:

#24 ngc2289

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Posted 02 November 2012 - 05:18 PM

Hmm. I was thinking maybe the delay is due to the crazy weather. If that is the case then I can wait! There are bigger concerns right now, and my little telescope project is not that important!! :ubetcha: :ubetcha: :ubetcha: :ubetcha: :ubetcha:

#25 magic612

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Posted 02 November 2012 - 06:52 PM

My experience is that Parcel Post can be both substantially faster - or slower - than what the USPS site states. And the more you want it, the slower it is. ;)






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