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Evening All A few weeks ago I decided to take my TOA150 off the mount for a while to give the Celestron Edge 14 a proper try-out. The refractor is beautifully straightforward to use - it "just works", has a wide field which makes plate solving easy, and a reasonably trouble-free focuser. I anticipated some problems moving to a long focal length mirror-shift SCT. I've fitted the Edge with a Lakeside motor focuser - rather than going the Crayford route I've put it on the normal primary mirror focus knob. I expected this to throw up challenges due to mirror shift, but after some experimentation with SGP settings I found the right combination of focus direction and backlash compensation which generates good V-curves and little net image shift between the beginning and the end of the focus run. I can definitely recommend the solution which Peter at Lakeside has come up with for this fitting. I'm using the OTA at native F/11 (3910 mm focal length), with an Atik 460ex CCD and Lodestar guider via an OAG on a Mesu-200 mount. Plate solving was an issue to begin with - the 460ex imaging area is quite small, and the system is slow. I've found that adopting 4 x 4 binning and 15 sec exposures for plate solving captures, usually works, and I can now centre a target in the middle of the frame from any part of the sky in 2 or max 3 plate solve cycles. By far the biggest challenge with the entire thing so far has been finding and keeping guidestars - in the wide field of the refractor it's hardly ever a problem, but with the 14" it's a real challenge for some targets because the area of sky captured by the Lodestar is so small. Very often there aren't any usefully bright ones available in the 4-8 second guide exposure times I'm using in PHD2, and now and again I've hit problems in which the guide star is lost because it has moved out of the guide square in PHD2 after a focus run - although I seem to have managed to tune most of that out now (I really wish there was a setting in SGP to perform a re-centre after auto-focus - that would solve lots of problems). Guiding at f/11 has posed no problem at all - really flat PHD2 curves. The "Target" view in PHD2 has shown clustering of points within the 0.5" circle most of the time this week. Collimation is probably not brilliant, and I've found having to think about that business to be a bit of a pain compared to the trouble-free experience of the refractor - not that it's difficult, just that it's something you have to do. At the beginning I spent a night jumping around from object to object, marvelling at how targets that are tiny in the refractor field of view suddenly fill the frame. But eventually I settled on NGC 2683 as the target for a proper first attempt at imaging with this combination. Result shown below. Exposures: 26 x L, 10 x R, 9 x G, 9 x B subs - all 600 sec with 2 x 2 binning. It's clearly far from perfect - I've tried not to introduce too much noise in processing but there's definitely noise there with mottled background being a real issue - though that's my processing not the instrument. I also have a problem in L with a couple of dust bunnies that aren't flat fielding out properly - either the filter wheel is not returning to exactly the same position, or I've had a small shift in the orientation of the camera. Need to check collimation as well. I think it's promising although there's more work to be done on the image and on the setup. However, by coincidence I'm posting on the same evening as @wimvb who has posted an image of the same target taken with an MN190 and 460ex, and the level of detail in Wim's image compares very well indeed with mine, despite the difference in the aperture and plate scale of the combination used - make of that what you will. I have my own views on why, and ultimately it's the refractor which will be mounted for most of the time - but the 14" certainly offers a lot of different options for imaging and I think it's worth working to tame the challenges which the design introduces. Nigel
For first light for my new scope & focuser, I decided to revisit this small galaxy in Lynx. Gear: SW Explorer MN190 on SW AZ-EQ6, with Pegasus Focuscube Camera: ZWO ASI174MM-Cool at -20 C, gain 20 Guiding: SW finderguider 9x50 with ASI120MM-S and PHD2 Software: INDI/Ekos for data capture, and PixInsight for processing Total integration time: 4.4 hrs L: 36 x 120 s R: 24 x 180 s G: 20 x 180 s B: 19 x 180 s (click on the image for a larger version) I hadn't quite anticipated the extra weight on my mount, especially the weight combined with the larger distance. I couldn't balance the scope even with the extension bar and both weights, so I had to improvise with a few clamps. I couldn't add the extra weight from the ST80. I had to guide with my 9x50 finder, which I normally only use for polar alignment. Also, today I noticed that the collimation still was a little off. It was WAAAY off when I unpacked the scope. The laser dot hit the primary about midway between the center dot and the edge. Collimation with the help of my barlowed laser put it quite close. Today I used a collimation cap to fine tune it.
It was fairly clear this evening so I got the scope set up to do some galaxy observing. After my first planned set of targets were stil lurking behind our walnut tree I had a look at Stellarium to see if there was anything else I might be able to see that wouldn't be obscured or so high to zenith to avoid the OTA colliding with the tripod (this prevented me viewing C7 - NGC 2403). Above Leo, in the tail of the constallation the Lynx, was a promising candidate NGC 2683. It's quite close to the naked eye stars alpha-Lyn and 38 Lyn and it's a fairly easy hop from alpha-Lyn to the triangle of stars HIP 4932, HIP 43584 and HIP 43410. This triangle fits neatly within the finder and the galaxy itself is quite close to HIP 43410. Once lined up, and the scope tracking, I popped in my 15 mm EP and had a look. The galaxy was pretty close to the centre of the FOV and I was knocked back by how bright it was. A much easier spot that I had expected. It appeared as a linear smudge and with patience yielded a little bit of detail. It would have been worthwhile trying slightly more magnification but I was keen to start some imaging before the moon came up. NGC 2683 is well worth a visit and it's certainly brighter than some Messier galaxies.