Re: [APML]: Re: [APML] Help

[steves@LAGUNA.EPCC.EDU]

On Tue, 17 Sep 1996, John Lumpp wrote:

> 
> I'm having a problem with deep sky photos using my 12" LX F10. I tried to 
> use the 6.3 focal reducer to reduce exposure times and make guiding 
> easier.The results were terrible.I had severe vignetting(central glow) in 
> the center of the print with a darker outer region.I live in area of 
> considerable light pollution.I used un-hypered fugi 800 and even at 5 
> minutes of exposure the problem occured.I'm thinking that the reducer can 
> only be used for visual work.If anyone has experience using a setup 
> similar to mine I'd like to know.I'm also using a JMI moto focus before 
> the reducer with the Taurus camera attached to the 6.3 reducer.I'm not 
> sure if that matters.I seem to be wasting alot of film and time.Any help 
> on this would be great. John L.
> 
John,

I have a Meade 10"SCT and also bought the 6.3 reducer and got severe 
vignetting.  The only solution was to buy a Lumicon Giant Easy Guider.  
It has a much larger opening and solves the vignetting problem.  
Unfortunately, it ain't cheap!

-----------------------------
Steve Smith
Visit my astronomy page at:
http://members.aol.com/stevesmit/