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What to do, what to do?

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#1 Guest_**DONOTDELETE**_*

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Posted 07 February 2004 - 04:23 PM

I have an old Meade 10" Starfinder dobsonian. The 2" focuser is best described by Ed Ting:

" The finder and focuser are made of incredibly cheap plastic, and should be put out of their misery at the earliest opportunity."

Needless to say, I ripped the finder out and replaced it with a Telrad. Last week, I finally got around to the focuser. I ordered a decent one from Orion ( Focuser ) with the cool aluminum wheels (Focuser wheels). However, now we have a problem.

My lowest power eyepiece (40mm) won't come into focus, because the lack of out travel; same for my 25mm and 10mm.

My question, should I send the focuser back and opt for one with more out travel or move the mirror cell back a little bit?

BTW, I already bottomed out the mirror on the cell and tryed to refocus.

Thanks!


#2 jmoore

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Posted 07 February 2004 - 04:39 PM

you could try an extension tube. Here's one that would work for 1.25" EPs. I imagine someone makes 'em for 2-inchers, too.

http://www.siebertop...converters.html

good luck.
jeff





#3 Guest_**DONOTDELETE**_*

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Posted 07 February 2004 - 04:46 PM

I was thinking about those also. However, my concern with adding on is, am I going to be able to focus in enough? I don't need 1.5 inches more, probably half an inch at most.

#4 Guest_**DONOTDELETE**_*

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Posted 07 February 2004 - 04:56 PM

Let me take that back. That looks like a great idea! Orion actually sells both 1.25" and 2" for less. Thanks!

P.S. I called Orion to ask how far out the tube extended, and the lady told me to call back on Monday and talk to a "tech". I thought they always had knowledgeable people there!

#5 Tom T

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Posted 07 February 2004 - 11:41 PM

Adam, they have a couple of different sizes.

IIRC, The one I have from them is a 2" that adds 1.5" of out travel....

Tom T.

#6 litespeed

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Posted 08 February 2004 - 10:18 AM

Adam,

Try a search for this.....

This topic was covered in detail recently. Within the last 2 months.

You may find your answers there.

AJ

#7 Guest_**DONOTDELETE**_*

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Posted 08 February 2004 - 05:48 PM

Thanks for all of your help. It looks like I'm going to buy the 2" extender from Orion. I figure if I have a problem with there not being enough in-travel, than I can just let the primary off of the cell a little bit to compensate!

Thanks again to everyone!


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