Hi Rick, I thought the deflection was inversely proportional to the cube of the thickness for a plate supported in the middle. Have I got it wrong? You meant...
Yes Dennis, You are correct. I was trying to put it in lay terms to simplfy. I actually don't think it even approaches being a factor (i mean with the short...
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Dec 2, 2004 4:16 am
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this was shot through my homemade 18" f/12.6 cassegrain at prime focus (F=5760mm). I used my IMG6303E camera and took 5 x 20 minute exposures binned 1x1. The...
Hi folks. I'm considering a used AP mount. I read that the old 1200DA mount used stepper motors. How noticable are the "steps" and were they microstepped? Are...
Hi Rick, ... I put a preliminary sketch of the OTA layout at: http://www.trivalleystargazers.org/gert/rc20atm/rc20side.jpg The mounting surface is the flat...
In a message dated 12/1/2004 11:47:16 PM Central Standard Time, ... At very high powers you may be able to see vibrations with a stepper motor drive if the...
Very nice job Richard, It looks like you have the scope fully tuned up now. What a great accomplishment. The image looks pretty close to the best that I have ...
Gert, I looked at one of my longer saddles last night. The knobs stick up above the saddle plate by approximately 1/4 inch. Assuming that you want the ability...
Hello Roland I know its not really the place to talk about SBig ccds but i know you have the 10 XE and wondered if you or anyone had opinions on this versus...
In a message dated 12/2/2004 11:08:13 AM Central Standard Time, ... If you are looking for the most sensitivity for deep sky nebulae etc, then I would go for...
... have ... You are too generous with your praise Rick. I am happy the image came out as nicely as it did but I have a growing list of mechanical issues I...
Richard, The mounts are very good. I am using an AP900 on my balcony and it will do excellent tracking for 5 minutes by simply doing polar scope alignment...
I love both of my AP mounts: i have a 2003 vintage 900GTO that I also use. it swings my c14 just fine i plan to take the big 18 out to fremont peak within the...
... my name is Franck one of the author of the modify on those mounts the "doodad" on the axis are absolute encoder positioning system, in the case there is a...
"At very high powers you may be able to see vibrations with a stepper motor drive if the telescope is light weight (SCT or other light weight Cassegrains). It...
In a message dated 12/2/2004 6:36:57 PM Central Standard Time, ... No, the above applies to a stepper drive. We have not used stepper drives for any of the GTO...
Hello, I am in the process of selecting a steel pier design for my observatory. The pier will support a 1200 GTO that will be carrying a 14" SCT and a 6" apo....
Dave, I found a 10" ID with 5/8" wall steel pipe from a steel/auto salvage yard. The pipe was 30' long I asked them for half the pipe they cut it for me and ...
Hi Dave, A half-inch wall thickness is uncalled for and will not materially increase the resistance to deflection. Think of the pier as an inverted pendulum....
I was just informed that AP is ready to ship my 1200. I sure hope I don't have to wait until the 25'th to play with it<g>! I guess this also means I'll be...
The Astro-Physics 1200 compatible saddles I make have an option of a smaller dia. knob. http://www.robincasady.com/Astro/dovetail.html However, even my...
Since my initial web page came out a week ago, Terry Platt, manufacturer of StarlightXpress cameras, offered to process the images taken with the SXV-H9C....
In a message dated 12/5/2004 1:53:46 PM Central Standard Time, ... He obviously stretched the one shot color image more to match the nebular detail of the...
Chris, If you want to come over and measure my ATS pier from my 1200 mount be my guest Mark www.aajonahfish.com/astronomyhaven.htm ... From: "Chris Curran"...
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