From: "dean_drumheller" <drumhellerd@smccd.edu>

Date: November 8, 2008 8:35:29 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: Moray

Thanks Alan, I'm trying both Milton's and your suggestions in a 

couple days. The image I posted was with 2x barlow. Moire is still 

there without the barlow, smaller of course. I'm interested in trying 

new cable, and rotating the camera. Thanks you guys. Dean--- In 

Astro_IIDC@yahoogroups.com, Alan Friedman <alan@...> wrote:

Hi Dean,

The dreaded moire pattern... it is coming from an interference 

between  

surfaces in the optical path - with the glass in front of the CCD 

chip  

most likely being one. Have you tried rotating the barlow or 

blocking  

filter or camera? Does it remain unchanged at different effective  

focal lengths?

I encountered this using a Nikon D1X with my Coronado solarmax 90  

years ago and I couldn't eliminate it. I have not had a problem 

with  

either of my DMK cameras, but others have. Strangely, I did notice 

the  

pattern just the other day for the first time using my DMK 41AF02  

camera with a Baader FFC. I tried using a long extension tube for  

higher power and saw it on the screen during capture for the first  

time in years. The magnification was too much for the seeing so I 

quit  

for the day. Yesterday, back to my usual settings with the FFC 

(3.5x)  

and all was fine.

I hope you are able to eliminate it. It is a nuisance to try and  

remove it in Photoshop.

Alan

On Nov 7, 2008, at 6:34 PM, dean_drumheller wrote:

Using DKF 31AF03.AS, I'm getting curved lines in all images and 

not  

sure how to deal with

them. I've tried many different focus, exposure and image 

controls  

and not making any

progress. Appreciate a starting point, any input on fixing the  

image. Thanks -Dean

Link: http://collegeofsanmateo.edu/astronomy/Image%20Post.asp