[Aavso-photometry] to Jeff Hopkins

[Jeff Hopkins]

Hello Yenal,

My ISP was down for nearly a whole day so my web sites and e-mail 
were unavailable. All is okay now.

Regarding the focusing, I do not have a 14" LX200R, but have no 
trouble with my 12" LX200GPS. I don't know what to tell you other 
than to continue to experiment. You may need to just work at the 
longer FR. Perhaps others can offer advice.

For AutoStar group photometry, first, a standard deviation of 0.03 is 
not bad. At best I get around 0.02. Second, I found it very important 
to make sure the images do not shift from image to image. The best 
way to do that is to have an auto tracking/guiding system.  If stars 
are spread a fair amount in position, the grouping works well, but if 
you have stars close together, using the grouping can cause the 
program to jump to the wrong stars.

Good luck and you should be able to email directly now.

Jeff

At 06:15 -0700 11/22/2007, Yenal Ogmen wrote:
>First of all, I am sorry for sending this email to the
>group but I was not able to reach Jeff Hopkins for the
>last 2 weeks. May be my emails were flagged as bulk
>email. I dont know. Therefore, I decided to send this
>email to the group to reach to Jeff. Sorry again.
>Anyone who can help me with my following questions,
>are welcomed.
>
>I have a question which I asked to many groups but
>didnt satisfied with answers.
>
>I am trying to use DSI Pro II at 14" LX200R with focal
>reducer f/3.3. But I cannot get to focus. Just before
>the focus, focus knob hits to the end. Here I use long
>tube supplied with variable t-adapter for reduction
>f/3.3. When I use small tube for f/5, I get to focus.
>But for wider view I need f/3.3 reduction. I tried to
>use it without microfocuser but nothing changed. What
>shall I do? Is there anything wrong with my optical
>train? If you need, I can send you the picture of my
>optical train.
>Another question is about Autostar group photometry.
>Last night I tried to do group photometry after
>aligning all the images as it saves too much time but
>I observed that sometimes the results from group
>photometry and single image photometry dont match.
>Sometimes they do, but sometimes they differ 0.03
>magnitude which I cannot accept. Why is it so?
>
>Thank you for your consideration.
>Clear Skies.
>
>Yenal Öðmen
>   Green Island Observatory Homepage
>www.geocities.com/yenalogmen
>Geçitkale
>North Cyprus
>
> 
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-- 
Jeff Hopkins
HPO SOFT
Counting Photons
http://www.hposoft.com/Astro/astro.html
Hopkins Phoenix Observatory
7812 West Clayton Drive
Phoenix, Arizona 85033-2439 U.S.A.
(623)849-5889
(623) 247-1190 (Fax)
www.hposoft.com