[Aavso-photometry] to Jeff Hopkins

[Yenal Ogmen]

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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