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Posts Made By: Kurt King

September 8, 2006 04:59 AM Forum: APM

SuperMono update

Posted By Kurt King

Good day Markus, Well I'm back to continue to hound you on where the latest production of the Monos stands. How are the 12mm & 14mm doing? Thanks.

March 9, 2007 06:40 PM Forum: Eyepieces

UO 25MM Super Erfle?

Posted By Kurt King

I was under the impression that long ago UO made a 25MM Super Erfle. I have the 16MM & 20MM and have been trying for sometime to acquire a 25MM. Perhaps they did not make a 25MM? Thanks for your comments.

January 16, 2008 02:45 PM Forum: Meteorites & Meteors

Newbie has same worn question

Posted By Kurt King

I was wondering how we know a meteorite is from Mars, or even the moon? In the case of the moon, rocks are available so I would guess we can go by a baseline sampling if all lunar material is similar in structure. How can we be sure a meteorite is Martian? Thanks!

January 29, 2008 09:41 PM Forum: Meteorites & Meteors

Advice on acquiring a Lunar & Martian meteorite

Posted By Kurt King

I would like to acquire both types of meteorites. Not slices or sections but whole meteorites. I'd like to avoid the "eyepiece aquisition disease". You know, starting off with $25 Russian Plossls and going thru the spectrum, finally settling with Naglers and Pentax XW's. The idea being to get a really nice meteorite and not want to trade or sell up. How does one become educated and acquire that nice Lunar & Martian meteorite? Are there individuals that can be relied on to deal with novices? Thanks for your advice and guidance.

August 1, 2008 08:18 AM Forum: Eyepieces

1.25" filters= what mm size?

Posted By Kurt King

Gentlemen, What filter size in millimeters can I order to fit standard 1.25" eyepieces? 31.75mm = 1.25" so I was wondering about that. Thanks very much.

June 9, 2009 09:21 AM Forum: Reflectors

Mirror math

Posted By Kurt King

Is it possible to calculate the accuracy of a spherical mirror in waves given the following parameters:
R=314.00" +- 1%
Smallest blur circle size =.06"
light source diameter=.03"

What can be expected in terms of spherical accuracy of either slope error or waves. I haven't been able to find a formula to answer this question. Your assistance is greatly appreciated!

November 18, 2009 06:10 AM Forum: Telescope Making

Memorial service for John Gregory

Posted By Kurt King

We have lost a truely great man. John has passed away after a car accident and Carolyn is in very serious condition. Posted is memorial information:

I can't remember if I told you the plan for an open informal memorial service for John at Lake Travis UMC (Lake Travis United Methodist Church is at 1502 RR 620 North in Austin) this Saturday, Nov 21st at 3:00pm. The sons and family of John would love to have all that touched or were touched by John's life to attend and meet them.

The sincere hope is for a formal memorial service after Carolyn's recovery but Johns sons and family need to have this service at this time.

Carolyn is still in serious condition and in need of prayers.

Would you be so kind as to share this with the local astronomy group and any others you can think of. A notice of service will be posted in the newspapers.

Thank you so much for all you are doing.

love you and John,

January 9, 2010 06:48 PM Forum: Maksutovs

Seeking Mak corrector pedigree

Posted By Kurt King

I recently picked up a molded Mak corrector that I know little about other than;
1) It has an OD of 10.88" and a clear aperture of 10.5" so the customary flat lip on the concave side is about .2" wide.
2) It is approx. 1.44" thick.
3) The R1(concave) is about 10.95". In looking at the Maksutov Circulars, this blank is neither of the two sizes that were originally offered to the members, all of whom settled on the 11.25" diameter blank with an R1 of 15.25". Enclosed are a couple of shots. Surfing the web has not lead to any sites or individuals that I could find. Any assistance with this blank would be greating appreciated. I'm really interested in what the design R1 & R2 were to be as well as the primary R. Thanks very much.

March 19, 2003 11:42 PM Forum: Telescope Making

Folded / Flexed Reflector designs

Posted By Kurt King

John, Your goals that have led you to your folded reflector remind me of my son's project whose goals were EXACTLY the same as yours. He decided on a folded Dall-Kirkham Newt. that would fit in his Honda CRX. It is a 10.5" with a 2" convex secondary and a 1.83" flat. It is an F/10 system with an F/5 primary. All the best on your project.

April 10, 2003 08:36 PM Forum: Equipment Talk

Extension tube needed

Posted By Kurt King

Thanks for all the help & sites. I checked Orion first thing but maybe I missed the tubes. I don't know the manufacture of this all black 5" refractor. It uses the 2 barlow tubes + a diagonal. Did I mention this lens is perfect when tested under collimation. With the extension tube + one of the violet filters ,this will be a nice scope.
Thanks again all.