Chris,

I don"t have much experience with the derotator but so far I like it very
much. Of course as with most things there are pros and cons to it. They
have been discussed many times on this list.

Pro: Ease of setup.
Easy two star alignment
Stable Alt/Az setup

Con: Must use off-axis guider
Max Alt is about 60 degrees

I might add a word about the 60 degree problem. I have not run into this
problem so far but if I do I will just wait until the object in question
passes zenith and begin my exposure as it starts down.

Thanks,
Richard Krick

39.19.40N
082.59.54W

http://www.bright.net/~krickrt

-----Original Message-----
Date: Thursday, August 20, 1998 11:57 PM
Subject: Re: [M]: OT Astrophotography


>Welcome to the wonderful world of long exposure astrophotography. It looks
>like you are getting a good start. So you are using the Meade Field
>Derotator? How do you like it?
>
>Chris Vedeler
>http://www.isomedia.com/homes/cvedeler/space.htm
>Tucson, AZ
>
>Dick Krick wrote:
>
>> Hi to all,
>>
>> I just posted some new photos of Jupiter, M5, M17. I am new to long
>> exposure astrophotography. This is my first attempt at long exposures.
My
>> setup is; tripod mounted LX200 f10, Field Derotator, off-axis guider,
>> Olympus OM1 camera. Photos were manually guided, I need a lot more
practice
>> at guiding, thats the reason the stars in M17 look a little ragged. The
>> Jupiter photos are 1 second and 1/2 second exposures. The M5 photo is a
20
>> minute exposure. The M17 photo is a 30 minute exposure.
>>
>> Thanks,
>> Richard Krick
>>
>> 39.19.40N
>> 082.59.54W
>>
>> http://www.bright.net/~krickrt
>
>
>
>

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