Depends on the type of circle you're trying to work with. Given the nature of this group, could it be that you want to center-spot your primary? Gordon...
Get a template from Cats Eye collimation tools. It doesn't cost much and is well worth the money. While you are at it, check out their collimation tools and...
For those considering enhancing their image contrast by blackening their interior OTA and focuser parts, I wanted to pass along a summary of my recent internet...
Hello Gang, You know, life at the ranch just hasn't been the same since the sale of my 15" Discovery Dob earlier this year. I sold it to finance a larger scope...
Congrats and enjoy the new scope!!! Joel Falk in Kansas Bill Leyrer <bill.leyrer@...> wrote: Hello Gang, You know, life at the ranch just hasn't been...
Very interesting!! That is not what his website says!!! Joel Falk in Kansas ... I asked that very question to Ed Stevens yesterday via email. He assures me he...
Swift Glass in NY quoted me (last week) several things including sheet Pyrex (available up to 2-1/4" thick) and Schott Borofloat (up to 25mm). Works for me -...
I was going to ask if sheet pyrex was still available. This was the material used for large dobsonians for many years, my 20-inch is 1 5/8-inch sheet and was...
Thank you for your input and the link....Lou ... From: John Mahony To: bigdob@yahoogroups.com Sent: Monday, November 06, 2006 5:47 PM Subject: Re: [bigdob] How...
How what it to focuse? did you have to focuse 2 focusers or were they conected somehow? ... From: John Mahony To: bigdob@yahoogroups.com Sent: Monday, November...
Here are a few Louis. http://www.binoscope.co.nz/index.html http://www.geocities.com/Paris/Cafe/7068/bino.html http://www.foothill.net/~sayre/Binocular.htm Pat...
I just got off the phone with one of our major and long time mirror makers in this industry whom we all know well, and they indicated to me that they talked...
Hello Carl, That's good info to know... I feel better already knowing that if in fact UPS does screw up my 20" mirror during shipment, there is hope of a...
Bill, I'm sure the other guys can and may have done the same research. What they may have to do is make changes, and that likely may affect pricing. Right now...
A club member machined simple helical focusers that fit into each external diagonal (tertiary). Since the inter-occular distance (IOD) is adjusted by moving...
At 09:06 AM 11/7/2006, louisdelsesto wrote: I would like to build a 8 inch newt bino's can any one direct me to some instructions ,website or any info on the...
Hi Carl, Larry: James, here at OMI. We've been doing our homework on the Pyrex/alternate supply issue. We've laid in a good supply of 2" thick Pyrex blanks and...
Anybody out there using the current version of these in a binoviewer on a fast (f/4.5 or faster) DOB? If so, how's the view? Got a new 18" f/4.5 and 3 people...
James, good to hear from you on this. Its always refreshing for the public to hear direct from a source rather than have to read conjecture from a third party...
John This is true, however if the added weight of glass floats deeper than the the thickness of the material doing the floating then somethings got to give. IE...
Sure, but some of the material sinks into the liquid. For example, a thin sheet of ice floats just fine on the surface of water but 90% of an ice berg is...
... No, the proportion (by volume) of the object under the liquid equals the density. 90% of a thin floating sheet of ice is under water, same as an iceberg. ...
Carl: I've looked at a few pieces of Borofloat and have come to the same conclusion. It's a very nice material. United Lens has some experience with frit...
John, There is a very important piece missing here. That has to do with displacement. Any object that displaces more than its own mass in a liquid will...
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