simonf Posted October 5, 2014 Share Posted October 5, 2014 i recently modded my 1100d and with it being clear last night i decided to try it out to try it out and make sure everything was fine, i started off with a few shots of Pleiades and straight away i noticed a problem, on the brighter stars you can see a red reflection and on the smaller stars there is red halos round them, I've attached an image below to show the problemi am using the skywatcher ed80 and a cls clip filter in the 1100d, i want using a reducer as i don't have one yet.could it be due to the mod, could it be a reflection from the clip filter, any help would be very much appreciated Link to comment Share on other sites More sharing options...
D4N Posted October 5, 2014 Share Posted October 5, 2014 It looks like out of focus IR light, it may be that your telescope does not bring the IR anywhere near the focal point of the other colours so unless you use a IR cut then this could be an issue. Not sure why they are off to one side though. I think most of the cls filters aren't IR cut. TSED70Q, iOptron Smart EQ pro, ASI-120MM, Finepix S5 pro. Link to comment Share on other sites More sharing options...
steppenwolf Posted October 5, 2014 Share Posted October 5, 2014 I don't think it's the modification itself - this looks like a close in reflection to me. I'd test again on a bright star both with and without the CLS Filter so that you can either rule that in or out before you try anything else. Link to comment Share on other sites More sharing options...
simonf Posted October 5, 2014 Author Share Posted October 5, 2014 thanks for the replies, I forgot to mention in my first post that the mod was to replace to original IR cut filterI'm going to try both with and without the cls filter, just have to wait for the cloud to clear now Link to comment Share on other sites More sharing options...
simonf Posted October 10, 2014 Author Share Posted October 10, 2014 so the reflection is still there without the filter Link to comment Share on other sites More sharing options...
Thalestris24 Posted October 11, 2014 Share Posted October 11, 2014 HiThe symptoms appear to be indicative of the filter not being parallel to the sensor I'm afraid.... That probably means needing to reseat the filter.... I found this reference with the same symptom - might be of interest:http://www.astronomyforum.net/astro-imaging-forum/174335-strange-reflections-after-mod.htmlLouise Link to comment Share on other sites More sharing options...
james_screech Posted October 11, 2014 Share Posted October 11, 2014 I had a similar problem when I used my modified 500D with an ED80. I found this artificial help sove the problem in post processing.http://budgetastro.com/micro/articals/red_halos/red_halos.htmlJames Link to comment Share on other sites More sharing options...
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