WilliamAstro Posted November 1, 2023 Share Posted November 1, 2023 I use a Canon 600D which is modified with an Optolong L-Pro filter equipped, The lens that I use is a Tamron 150-600 What is causing these star halos and how can I resolve this issue? Cheers William Link to comment Share on other sites More sharing options...
saac Posted November 1, 2023 Share Posted November 1, 2023 No expert but would an IR cut filter help. Jim Link to comment Share on other sites More sharing options...
happy-kat Posted November 1, 2023 Share Posted November 1, 2023 Do you get the halos if the L- pro filter is not used Link to comment Share on other sites More sharing options...
Elp Posted November 1, 2023 Share Posted November 1, 2023 (edited) Optolongs are prone to this but I haven't seen anyone complain about an Lpro causing it. Pleiades are very bright stars so best to avoid such filters around stars with a similar magnitude. Edited November 1, 2023 by Elp Link to comment Share on other sites More sharing options...
Albir phil Posted November 1, 2023 Share Posted November 1, 2023 Yes I found best with no filters also I found better results using my unmodified DSLR instead of my modded one on this kind of object. Link to comment Share on other sites More sharing options...
sharkmelley Posted November 11, 2023 Share Posted November 11, 2023 To help diagnosis, you need to calculate the additional length to the light path caused by the reflected rays. The CCDWare dust donut calculator will do this for you: http://76.12.87.114/resources/dust.cfm Link to comment Share on other sites More sharing options...
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