From: "Tim" <tjp314@pacbell.net>
Date: February 13, 2008 5:18:35 AM MST
To: Astro_IIDC@yahoogroups.com
Subject: Re: Focusing
Hi folks!
I had over a month of bad weather, followed by some business trips, so
I haven't had the covers off my scopes since before the Holidays
(withdrawals are getting painful!), but I thought I'd chime in with my
focuser experiences:
For my 9.25", which is mounted in the roof of my house, once I get the
scope and camera on my subject, I close doors beneath the scope (to
isolate it from internal heat) and run it from my desk in the attic.
I use s Robofocus for robotic control of the 9.25" focuser.
Previously, I've used their software on an old HP laptop. But
recently I downloaded the demo version of Darryl Robertson's EquinoX
Image, which has robofocus control. Works like a charm in OSX, so I
may be one step closer to retiring that PC! It'll also operate SBIG
cameras, so if you have one of those, you can image with it while
guiding with your firewire camera (or vice versa).
For manual focusing on my other scopes, I've found this method to work
very well if you don't have a focuser with a microfocus on it, or even
if you do but your mount shakes when you grab the knob:
*If you're way out of focus, set the exposure to 1" and bump the
brightness all the way up. That usually reveals the out of focus
stars and planets pretty well (something you can't do with a webcam at
fraction of a second exposures).
*Get the focus in the ballpark manually, then clamp one of those 6"
"quickclamps" (that's a brand name for them, there are a number of
makers, though) to the focus knob. Now, you can fine focus by simply
pushing on the end of the clamp bar with your finger, thus minimizing
shake. I call this my "armstrong microfocuser"! ;oD
Hope this helps.
-Tim.
--- In Astro_IIDC@yahoogroups.com, "gaffney.mark" <markgaffney@...> wrote:
--- In Astro_IIDC@yahoogroups.com, Milton Aupperle <milton@> wrote:
Hi Mark;
On 10-Feb-08, at 8:40 PM, gaffney.mark wrote:
--- In Astro_IIDC@yahoogroups.com, Milton Aupperle <milton@> wrote:
My problem is that I`m not using a lap-top near the telescope
when
focusing and the
process can be quite a pain ( walking backwards and forwards from
scope to computer to
consult changes in focus). I was looking for anything which would
make it easier- short of
taking the computer outside on a table or something. Even without
computer control a
remote with long cable to a motor outside might be the only
solution. I gather the other
platform for the Lacey controller is called CCDSoft. Mark.
That's a different problem then. What would be cheap for manual
focus
is a
Shoe String Astronomy USB Focus Motor Controller (FCUSB)
http://www.store.shoestringastronomy.com/products_fc.htm
which is said to work with several focusers (JMI Motofocus, Moonlite
DC motorized focusers, Orion AccuFocus, Meade 1209, and Televue
Focusmate)
and then use this software for manual focus
http://www.stark-labs.com./SSFocus.html
control. I'll lay bets you can hook multiple cables together between
the focuser and the USB device that will be long enough for you to
focus remotely.
HTH..
Milton J. Aupperle
President
ASC - Aupperle Services and Contracting
Mac Software (Drivers, Components and Application) Specialist
#1005 - 815 14th Avenue. S.W.
Calgary Alberta T2R0N5
1-(403)-229-9456
milton@
www.outcastsoft.com
Thanks Milton, I`ll get around to all this when I`m more solvent! I
have 2x 25 foot cables
already for the GPUSB device and a connector- It`ll just be a matter
of getting some more
of the same description. Mark.