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Will this work?


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#1 swholden

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Posted 23 September 2008 - 04:55 PM

MTaylor could probably answer this question better or Mark or anone for that matter (I value all opinions)..........

I was just reading something on Mike Weasner's site, and had an idea.

Focusing with my DSI is and always has been difficult and time consuming.

So, what if I do this?

1) Attach my DSI to the rear port (which I have the adapters for)

2) Insert an eyepiece on top. Say my 15mm or what ever.

3) Focus my DSI on a terresterial object at a distance.

4) Using my parfocal ring, make the needed adjustment to my eyepiece.

Then, couldn't I then just focus with my eyepiece, flip the mirror and ta dah, my DSI would be focused?

Well, better than trying to focus with the camera by itself?

Thanks, just a thought, 'cause well, I'm always thinking. :(
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#2 swholden

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Posted 23 September 2008 - 05:30 PM

Sorry, I think I answered my own question. :(

Looks like this will work. I should have read the instructions again from my DSI, but we all know how incomplete they can be sometimes.

I'm going to give this a shot over the next few days.
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#3 provencial

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Posted 23 September 2008 - 09:26 PM

I found focusing a DSI 2 Imager is a lot harder to do on telescopes with a long focal length like the ETX.
On my LXD75 SN8, It's a breeze. Switch over to the ETX125 and I can never seem to get it perfect, even with the parfocal ring.
Maybe it's just me?

#4 Mark Sibole

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Posted 26 September 2008 - 12:26 PM

Focusing on a short focal length Telescope is a lot easier because you dont the the high magnificalion which lends to bring up the atmospheric disturbances.
Shorter focal lenght telescopes will be a lot easier to mange for the lack of magnification but you dont amplify the atmospheric disturbances.

Mark
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#5 Tony

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Posted 11 November 2008 - 04:48 PM

Early in my quest to learn how to image with my ETX 125, I experimented with a hartman mask made out of cardboard. I have to say it helped a lot. My first one was just two circles cut carelessly in the circle that covered the scope. My next one was the triangle one from Billyard, that provides spikes that you can bring to a sharp point focus. Once this is done for distance, it seemed to work pretty well. I just pick out a bright star, use the mask, focus, and then move to other targets.

cheers




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