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  1. Having waited in vain for the clouds to clear on Tuesday night, it was great to get out and finally see some stars last night! I'd picked out a new spot to try on the South Downs just outside Winchester, on a well made farm track that runs due South just across the A272 from Cheesefoot Head viewpoint car-park. In the daytime this is an airy downland spot filled with wild flowers and Skylark song, by night it offers a super horizon from SE. round to NW. with the pretty but invasive lights of Southampton port and Fawley refinery 15 miles or so S - SW. Lightpollutionmap.info says it has an SQM of spot on 21, a worthwhile improvement for a ten minute drive over my rugby pitch site at 20.27 and only a fraction lighter than Farley Mount - and minus the third of a mile carry through slightly eerie Yew woodland! I got up there about 11.45 - just in time for an ISS pass which I caught to the NW along with my first definite noctilucent cloud sighting to the N. Seeing was quite steady and transparency good outside of bands of thin high cloud that cleared as the night wore on. There was some haze that mingled with LP over the coast causing extinction below 10 degrees or so. I'd planned a recce session in the Sagittarius area using an ST80 and a couple of new filters - Baader O-III and ES UHC to try on the nebulae. After aligning on Arcturus and Altair I toured the region finding the UHC really helpful in cutting through the low-down murk. Many first views with the Lagoon Nebula M8, Eagle & Swan Nebulae M16/17 and Trifid Nebula M20 the standout highlights, the first of many visits I'm certain. All observations were made with a Baader Hyperion 24mm (21x) and Baader Classic Ortho 18mm (28x) and interchanging filters and natural view to tease out the detail. Later I switched to 2 inch mode and used a 31mm Hyperion Aspheric (16x) for some panoramic views. All stunning stuff! M16 elongated cluster, Hercules like shape, double upper L of “keystone”. UHC brought out dark lanes crossing. M17 prominent orange star above, glowing nebulous area below right of faint trapezium asterism. Dark tendrils with AV. M8 - epic. Bright clusters multiple dark areas and glowing patches. O-III enhanced the cloud to 20% width of fov in 18mm M21- arrowhead cluster M20 - stunning star spangled glowing nebula with dark lanes. Fuzzy cloud wider with O-III. M22 - bright compact glob. Triangle with centre star asterism to L. Diagonal pair to upper R. [RACI view] M4, 6, 7, 19 too low in murk over Southampton to pick out. Widefield (31mm Hyperion, 2-inch) on M8, 20, 21 stunning field. M24 bright blue beehive like M16/17 In same field. Wow. M18 - rich field, pronounced "V" to R. It was after 2 by this time, so I took a quick tour around M57, a squint at part of the Veil Nebula with the O-III filter (warrants much more time!) and grabbed a great view of M31 which was easily visible naked eye at this point. With the 18mm I was for the first time able to pick out M32 & M110 - bonus! I resisted the temptation to switch to Jupiter & Saturn, by now quite high to the South, packed away and enjoyed a last sweep of the Milky Way naked eye and with 10x50s - vertical and almost visible to the horizon (barring those port lights!). Rolled back down the hill after a lovely shirtsleeves session in a super new spot. Mainly today I am drinking coffee...
  2. I have been at the lookout for a wide field scope (what some people call astrographs) and this spring I came across a nearly unused RASA8, and after 6 months waiting time, due to the virus situation, I finally received an ASI2600MC - an APS-C sized cooled OSC with relatively small pixels (3.76 µm) that kind of fit the 400 mm FL of the RASA8 (ca 2 "/pix sampling). As I allready had my two obsies filled up with other scopes I decided to spend the summer building a third obsy for the RASA to put on my long-time retired NEQ6, my first mount bought in 2014 when I started my AP adventure, but having been laying in a closet for the last five years, beeing replaced by an EQ8 and a Mesu in my other obsies. Up here astrodarkness started a few days ago, and on Saturday I could finally get the first light out of the RASA and ASI2600. I thought I would go for something simple, at least something I could easily find with the NEQ6 and hand controller: M31. I have to say I am very impressed with both the scope and camera. The collimation of the RASA was spot on (round defocused stars) and it maintained focus all night, although all night here is now only three hours. I am equally impressed with this new ASI camera. As promised there is no amp glow so no need for darks. There was also virually no vignetting by the RASA8 although it is stated to perform best up to an image circle of 22mm. The diagonal of the ASI2600 is 28mm. However, the stars in the corners were a bit elongated, probaly due to minor tilt, but trying to fix that on an f/2 telescope could be quite challenging and it will at least not be my first priority. Andromeda fitted with margin so I could crop away the edges. I don't think anything I have set up to do in AP has been as smooth as this. Fortunately I found that Baader make a 7.5 mm T2 extension that is what is exactly needed to fit the ASI2600 to the T2 adapter of the RASA to get to the 29 mm chip distance. The ASICAP program I use for my older ASI cameras did not work with the 2600 but I soon found out that there is a new ASICAP hidden within the new bundle called ASIStudio. Focus was easy and it kept all night - I have heard that about the RASA before (like on Chuck's Astrophotography on Youtube). So my conclusion is that the RASA8, even being an f/2 scope, which is supposed to be extremely tricky to use, is very easy to get working. I think that bad rumour may come from the Hyperstar attachement that you can fit to SCT scopes, but the RASA is dedicated to this and apparently hardly ever needs collimation. Olly @ollypenrice, may have a comment? My only complaint so far is the star shapes that may not impress pixel peepers (including me) but I think I can improve on them by organizing the two cables to the camera in a curved form - I am trying that out tonight on M33 (EDIT: It worked, se my M33 post). So, enough rambling about the RASA, here are my first 90 minutes (180 x 30 seconds at gain 100) aquired with the RASA8 and ASI2600. No flats (I did take some but it looked better without) and no darks (not needed with the ASI2600). Stacked in PI and processed in PS. I also tried 70 x 60 seconds at gain 0, and it looked similar but not really as good. I should make a thread about the obsy build - I had to go to plan C before it worked out. Cheers Göran EDIT: at the bottom I added a non-cropped version including both the gain 0 and gain 100 data, so totally 160 minutes and a bit more dust and core details.
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