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Everything posted by Stu
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From the album: SX250 Project
The fan will sit behind it all, now with a clear path to the back of the primary and plenty of cooling vents -
From the album: SX250 Project
The M8 threaded bar will be fixed into the support. This will then rest on springs between it and the base plate, with thumbscrews on the back to allow easier collimation. Primary will, as before, just be siliconed to the support -
From the album: SX250 Project
Matching fan hole machined out and three M8 threads cut to take collimation bolts -
From the album: SX250 Project
Vent holes and a central fan hole have been machined in the base. The smaller threaded holes have been taken out to M10 to allow M8 threaded rod to pass through. -
From the album: SX250 Project
Sold some time ago -
From the album: SX250 Project
Going free if anyone wants it! -
From the album: SX250 Project
I had been using on a Giro style mount but will convert to Dob -
From the album: SX250 Project
Collimation is a little agricultural, and no cooling. R&P focuser functional but to be replaced with a Steeltrack -
From the album: SX250 Project
Silicone mounted to an Ali disk. -
From the album: SX250 Project
This is supposed to be 1/8th pv but not sure. It needs a recoat anyway -
From the album: SX250 Project
The original thick vanes spider, to be replaced with a 4 vane, thin version -
From the album: SX250 Project
Could do with flocking. -
From the album: SX250 Project
Plenty of holes! Moonshane kindly drilled the holes for the new focuser a year or so ago! Time to get this done! -
From the album: SX250 Project
The OTA stripped down -
Just out of interest, I weighed these two this evening. With clamshell, dovetail and 2" Everbrite diagonal, the TV76 was 3.8kg and the Genesis 5.1kg. Doesn't surprise me having felt them both but surprised the Gen is so light!
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Agreed, but think about this. With the C9.25 and the nag you get a 1.1 degree field of view. That's only enough to fit the central core in really. With the 76 and Pronto you get 5.3 degrees (maybe a little less due to field stop, not sure). Under a light polluted sky it will be fairly useless, but get somewhere really dark, with inky black skies and good dark adaptation and you can really begin to see the full extent of the galaxy. It is huge!
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Certainly have Shaun, at least I have in the 76. It's a really wonderful sight, the star colours are lovely. That's one thing I love about these scopes, looking at clusters and really seeing all the different colours peppering the view. Easy enough to find, don't need Goto for that :-). The Double Double splits very nicely in it too so it well worth a look. Have you tried Almach? Another of my favourites, and if you fancy a challenge you could try Izar. That's really quite tight but I can split it with the 76. Cheers, Stu
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Well I would apologise, but if the end result is you getting to experience the same fabulous views then all is good :-). Hope it arrives soon, and you get a clear day. Don't forget to fit the polarizing filter to the EP, especially if you are changing them over. Don't think it is dangerous without but you might see purple and green dots in front of your eyes for a while!
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Thanks Shaun. I really love the 76, wonderful little scope. Have heard very good things about the Pronto too. The views are lovely, and the chunky, beautiful engineering is pretty good too. Feels like a little tank! It's amazingly capable for such a small scope and so quick to setup, as you are finding out :-). I've since found out (via Kerry's thread) that what I confidently described as a shadow transit was actually Callisto. I had no idea it was to dark, it's the first time I've seen a moon visible over the surface other than when they are near the limb. The other moons just seem to blend in with the surface of Jupiter. Very nice to see. Stu
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Left the tripod out and switched things around to add the Genesis alongside the 76 for a bit of side by side on Jupiter and a few other favourites. There is no adjustment horizontally so they are not quite lined up, but near enough. Will try another configuration to see if I can sort that. Jupiter was looking very nice, a reasonable amount of detail visible. I could just see the GRS coming round the corner but unfortunately it clouded over before it transited. Some nice detail in the belts, and what was obviously a shadow transit centre towards the bottom, couldn't see any sign of Callisto though. This detail was visible in both scopes. I actually am preferring the view through the 76 at the moment, particularly at higher powers. I think the collimation is out on the Genesis still and star shapes are nicer, with less (no) CA in the 76. That said, I bought the Genesis for its flat, widefield views and it does those wonderfully. I shall have another tweak again, or perhaps consider getting it somewhere for a service. M42 looked lovely in both scopes, nice sharp trapezium and nice mottling detail in the nebulae. The 'wings' looked very well defined despite the LP and no filters. Only other thing I viewed was the double cluster. Beautiful in both, but again just that bit sharper in the 76. Really wonderful tiny stars peppering the view at the limit of visibility, one of my favourite things to view. Clouded over and have now packed up. This was an unexpected session, forecast was not good so was nice to see the shadow transit, shame about GRS. Stu
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Despite being on decorating duty today, I managed to pop the scopes out this afternoon for a quick look at the sun. I have acquired a couple of bits to make my mini giro setup a little more compact, namely a 13cm counterweight bar (Teleskop Service) and smaller L-bracket (365 Astronomy), and was just wanting to try them out. All worked well, the mount is still well balanced and moves smoothly. It's quite easy to align the PST and 76 so that they both point at the sun, avoiding constant movement and making comparisons between Ha and white light views very easy. The photos show the before and after kit shot, much better now. The only other things I might do is replace the az tightening knob with something a little bigger, that would make fine adjustment of tension easier. The views through the Herschel Wedge in the 76 are really lovely, granulation nicely visible, and some amazing detail in the Active Regions. The sketches on the forum are very good representations. PST view was a little quieter to me today, no particularly big proms around but stil some nice views. This kit is very quick to setup and gives really satisfying results. Stu
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Thanks for the comment Duncan. I would love to be able to see the MW from here, but I've only once had hints of it on a very clear dark night :-(. In general, I reckon aperture always helps so the 12" should be very nice. Where aperture doesn't help very much at all is with low surface brightness objects. If the object is fainter than the sky background then it doesn't matter how much aperture you have, the object won't be visible. I generally concentrate on planets, doubles, open and globular clusters from home, with the occasional look at something like M81/2. The other objects I tend to leave for holidays or rare star parties. I do love refractors for the pin point star shapes and wide field views. Cheers, Stu