Quote:
Originally Posted by Garyh
Both nice and deep images Doug! I like them.
Was thinking of getting a QHY8 but decided to upgrade to the 40D. Soon to be cooooled 
I have seen these reflections in a lot of images done with this and frankly it has put me off abit in getting one.
Would it be possible to replace the optical window with like a baader one.? |
I doubt the reflection is the result of the type of filter used but rather the distance between the filter and the CCD. QHY is now going to make a null front for the QHY8Pro to allow this type of setup to be used. You can already get a null extender for the stock QHY8. The biggest problem with the mod will be keeping the CCD chamber free of moist air.
Be aware the Astro 40D does exhibit some reflection problems on bright stars. May be worth contacting EXFSO as he hs had some reflection woes with his Astro 40D.