Kon Posted December 2, 2021 Share Posted December 2, 2021 I recently purchased an Hb filter (ES) from a fellow SGL member @PeterW. I started with the Pleiades just to get my hand with it and surprisingly it was allowing for some nebulosity to come through. California nebula was my next target. I got in the area and I was surprised by the size of it. I had to move the Dob around to get the edges of it. No distinct features but just a 'block' of nebulosity. By then Orion was in the right place. I started without any filter. The M42 looked great. I could see some pinkinsh colour around the trapezium area as before whereas the trapezium was surrounded by a hue of green. The wings were nicely showing with distinct features, but no colour this time as my previous observation. I then popped the new filter and a new 'world' came through. The filter tamed the brightness of the trapezium and revealed nebulosity across the two wings rather than showing 'empty space or very very weak nebulosity without one'. The nebulosity made me realise that it extends much more than what I had seen before; it reminded me of the astro photos but in black and white. I thought since seeing is good to try for the horse's head 🐴. The filter nicely tamed the brightness of Altinak. I could see more nebulosity around it than without any filter; it has always been a bit of bluish hazy brightness. I panned around for the Horsehead nebula but I just could not see anything. I could not see much nebula either in the area. Is an 8" Dob not up to the job? Or do bortle 3/4 skies not ideal? I finished my session by looking at some clusters (no filter). The Persei double cluster looked awesome with all the stars and colours there. I spent a bit of time jsut being mesmerised. I had a look at NGC957 and NGC744 as well with nice resolved stars. Overall an excellent night and very pleased with the new purchase. looking forward to come up with more targets ofr the new filter. 9 Link to comment Share on other sites More sharing options...
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