... Unfortunately that does seem to be the nature of email lists in general. Although, you have to admit, the thread was pretty much a unique experience. I...
71329
rbethman
Nov 1, 2004 10:09 pm
Tom - Short and sweet - Bob's Knobs are MORE than worth the money - and the care required to install them! Bob - N0DGN ... < Bob Bethman -...
71330
sheppard_alan
Nov 1, 2004 10:51 pm
Options for Bob' Knobs (posted to other groups) I will stick just to the subject here, I did respond to the discussion a week or so ago, but want to add a...
71331
sheppard_alan
Nov 1, 2004 11:09 pm
What screw & which direction - Collimation My question: I have read many articles on the method of which screw and which way to adjust the secondary. Some ...
71332
gstrumol
Nov 2, 2004 12:00 am
Forget diagrams. Here is a simple rule. Look at the slightly out of focus diffraction pattern. Note the direction of eccentricity. Say it is skewed towards...
71333
John Mahony
jmmahony
Nov 2, 2004 12:43 am
Wow, I agree- you win the granite nads award for taking a grinding tool to a mirror that's already been polished, figured, and coated. My flats are also...
71334
Alan
sheppard_alan
Nov 2, 2004 1:41 am
Thanks Gary, I have done something similar and appreciate the feedback. I guess I am just trying to understand just what is happening. The ABC method seemed...
71335
John Mahony
jmmahony
Nov 2, 2004 1:55 am
... I agree, but it seems like you can patent just about anything, and the idea of using thumbscrews for collimation may qualify. In the recently settled...
71336
Bob Midiri
astroram57
Nov 2, 2004 2:27 am
Hi I have an older Celestron/Vixen 8x50 RA polar finder with the illuminated reticle. Unfortunately the batteries recommended in my Celestron Manual are no...
71337
John Mahony
jmmahony
Nov 2, 2004 2:33 am
... The issue of red-light intensity really needs to be emphasized more for newbies. In recent years, I've seen way too many people walking around at dark-sky...
71338
Don D'Egidio
astrojunkie52
Nov 2, 2004 2:35 am
Bob, You can get a replacement PX14A from here for $5.99. http://www.batteryguys.com/shop/customer/home.php?cat=7&page=2 Don ... From: "Bob Midiri"...
71339
Don D'Egidio
astrojunkie52
Nov 2, 2004 2:42 am
Bob, Here's a better price. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=43447&item=3807414025 Don ... From: "Bob Midiri" <astroramrx@...> ...
71340
Thad Floryan
thad_floryan
Nov 2, 2004 2:56 am
... That's for sure. Here in California everything from cancer to auto crashes to drowning to shootings seems to be listed as: "congestive heart failure" ...
71341
geoff beneze
geoffbeneze
Nov 2, 2004 3:00 am
... I've met more than a few elk and deer who have had "30 caliber heart attack" (G). AND, as they say, the "leading cause of death is Life." Makes you wonder...
71342
RMOLLISE@...
rmollise
Nov 2, 2004 3:06 am
In a message dated 11/1/04 9:03:30 PM Central Standard Time, geoffb@... writes: I've met more than a few elk and deer who have had "30...
71343
P T Chambers
phil11111111
Nov 2, 2004 3:11 am
Hi The original battery was a mercury cell which is no longer manufactured. There are replacements around not made with mercury. They are relatively scarce...
71344
geoff beneze
geoffbeneze
Nov 2, 2004 3:11 am
... (G) yea, something like that. There's a elk walking around near the south rim of the Canyon just WAITING for me to arrive in four weeks! Made chili tonight...
71345
geoff beneze
geoffbeneze
Nov 2, 2004 3:23 am
... For many of my devices that have odd or obsolete batteries, I cut a dowl or wood block to the size/shape of the battery, attach terminals and run the wire...
71346
P T Chambers
phil11111111
Nov 2, 2004 3:33 am
Hi Your method would work well with this one too. I forgot to mention that the original battery is a 2.7 volt mercury cell. The lithiums are 3 volts and...
71347
John Mahony
jmmahony
Nov 2, 2004 4:12 am
If you count your top screw as A, with B and C ordered counterclockwise from there, then just rotate the diagram 180° and it will work. -John ... ...
71348
Peter Santangeli
psantangeli
Nov 2, 2004 5:09 am
I just added some mirror locking bolts to my (older) C11. They are at 120 degrees from the focuser and are 1/4 20 bolts that contact dimes that are silicon...
71349
Rob Adkins
rob_adkins2003
Nov 2, 2004 5:24 am
Hi Rex, Just thought I'd throw in my two cents worth. I have a couple of small slots cut in the bottom of my home-made insulated dewshield about an inch in ...
71350
P T Chambers
phil11111111
Nov 2, 2004 5:39 am
Hi Pete Are you sure it is not showing a 3 lobed pattern ?? Mirror locks that press against the back can easily distort the primary. The way to get around the...
71351
Chris Peterson
cloudbait
Nov 2, 2004 7:30 am
Well, my dewshield is mostly vents, since it is made from a set of stacked rings- in my case, 1/4" foamcore, each ring with about a 12" ID, 16" OD, and spaced...
71352
Roger Hamlett
ttelmah
Nov 2, 2004 10:45 am
... In fact, you probably fixed it by other things, than what you thought did it!... The mirror on an SCT, does not have to have the hole central. Because the ...
71353
John Mahony
jmmahony
Nov 2, 2004 11:20 am
... These two issues are interrelated. I've never taken an SCT apart that far, but my understanding is that there is a flat surface on the center part of the...
71354
John Mahony
jmmahony
Nov 2, 2004 11:27 am
The three bolts you added are effectively acting as three collimation screws for the primary, just like in a Newtonian, but with very limited range. When you...
71355
John Mahony
jmmahony
Nov 2, 2004 11:44 am
The Sloan survey uses a scope that looks like this <http://www.sdss.org/tour/main_telescope.html>, but the upper section is described as "internal light...
71356
jcdc447
Nov 2, 2004 1:30 pm
lets get back to astronomy gentlemen please....
71357
starhopper44
Nov 2, 2004 1:31 pm
... ^^^^^^^ Think you had a slip there John - I saw "...external WIND baffles"; they help keep the wind from shaking the scope. But was there something there...
