Re: [M]: Focus 416XTE
| Subject: | Re: [M]: Focus 416XTE |
| From: | Email address hidden |
| Date: | Mon Jun 05 20:26:25 2000 |
Collimate your scope, this might help.
AV
On Mon, 05 Jun 2000 08:06:46 -0600 "Cliff Peterson"
writes:
> Im very new to CCD astronomy so this probably is a dumb question but
> Im having a great deal of trouble getting the 416XTE to come into
> focus. Using a mag 3.5 star, I can start on either sides of focus
> where the image show the secondary in the image and carefully work
> towards the focus point. The image gets smaller and the current gets
> higher. I generally have to shorten the exposure time so the image
> doesnt overflow the well as it gets closer to what I believe is the
> focus point. So far I havent been able to get the star image to a
> small pin point. At best the image of a globular cluster (M80) looks
> like a snow ball surrounded by snow flakes. Ive checked collimation
> with a 3 hole Hartman mask and at high powers the three holes come
> together simultaneously as I would expect them to.
>
> If I image the Moon the image isnt to bad and I can see detail.
>
> I sure could use some guidance from the experienced folks out there.
>
> Thanks in advance,
>
> Cliff Peterson
>
>
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AV
On Mon, 05 Jun 2000 08:06:46 -0600 "Cliff Peterson"
writes:
> Im very new to CCD astronomy so this probably is a dumb question but
> Im having a great deal of trouble getting the 416XTE to come into
> focus. Using a mag 3.5 star, I can start on either sides of focus
> where the image show the secondary in the image and carefully work
> towards the focus point. The image gets smaller and the current gets
> higher. I generally have to shorten the exposure time so the image
> doesnt overflow the well as it gets closer to what I believe is the
> focus point. So far I havent been able to get the star image to a
> small pin point. At best the image of a globular cluster (M80) looks
> like a snow ball surrounded by snow flakes. Ive checked collimation
> with a 3 hole Hartman mask and at high powers the three holes come
> together simultaneously as I would expect them to.
>
> If I image the Moon the image isnt to bad and I can see detail.
>
> I sure could use some guidance from the experienced folks out there.
>
> Thanks in advance,
>
> Cliff Peterson
>
>
________________________________________________________________
YOURE PAYING TOO MUCH FOR THE INTERNET!
Juno now offers FREE Internet Access!
Try it today - theres no risk! For your FREE software, visit:
http://dl.www.juno.com/get/tagj.
