Re: [APML]: cn 212 feedback

["John Gleason" <dvj@earthlink.net>]

The Astro-Photography Mailing List
------------------------------------

Leonard, 

Is the 35mm field fully illuminated at the Newtonian end?  

jg

----------
> From: Leonard L. Amburgey <lla@net1plus.com>
> To: astro-photo@nightsky.com
> Subject: Re: [APML]: cn 212 feedback
> Date: Monday, August 31, 1998 5:35 PM
> 
> The Astro-Photography Mailing List
> ------------------------------------
> 
> 
> *********************************************************************
>       Scott Observatory ----  Minor Planet Center #823
>         Latitude: 42N 36' 34" Longitude: 71W 49' 51"
>                 Fitchburg, Massachusetts USA
> *********************************************************************
> 
> I use a CN212, and have for two years.   It is an unusual instrument.   
My
> uses are mostly CCD work, although I do shoot film on occasion.   If you
can
> be more specific about your use, I can better answer your questions.
> 
> The instrument visually exceeded my C-11, which had very good optics.  
The
> Cass end is very good for planetary and Lunar imaging, and excellent
> visually.    The Newtonian end has pin point stars from across the
corners
> of 35 mm film (about 41 mm).   You need to use the field flattener and
> corrector for photographic work, focus is critical.   Visually, the
> Newtonian end should have a visual comma corrector, as such is visible at
> about 1/2 degree.   Although, it will still outperform most other
> instruments.
> 
> You can switch from one to the other easily, it does maintain its
> collimation.   Now, if your instrument does require collimating it can be
> somewhat tricky, and you should know what you are doing.   Some people
once
> they start fooling around with this have run into problems.
> 
> As a production instrument, you can't get much better.   You can usually
> find several sites around that have pages of photographs.  I personally
> don't have a web page.
> 
> 
> If you have further questions you can ask.
> 
> 
> Len Amburgey
> -----Original Message-----
> From: The PALLEZfamily <pierrejean.pallez@span.ch>
> To: astro-photo@nightsky.com <astro-photo@nightsky.com>
> Date: Monday, August 31, 1998 2:14 PM
> Subject: [APML]: cn 212 feedback
> 
> 
> >The Astro-Photography Mailing List
> >------------------------------------
> >
> >hi everyone
> >
> >I might get myself a takahashi CN212 and I am looking for some feedback
> >on this product. Does anyone on the list own this scope or can anyone
> >provide me with some input ?
> >
> >
>