alan potts
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Posts posted by alan potts
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I convinced myself expensive is best, though they do have much better build quality. I have 3 TeleVue diagonals and some time after bought a WO at about a 1/3 of the price, cant tell them apart if I am honest.
Alan
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Is it possible for any of you eagle eyed members to tell me which way the spacing is out from this shot of the Soul Neb, is it too short or too long.
I am not totally sure it is focused spot on, a task i have to say I fine very difficult with this new to me type of focus ring, seems as if you need to move it a millionth of a millimeter. To get this close took me 25mins
I need to achieve a spacing of 37.5mm and at the moment I feel I am close using a slimmer than required spacing ring and some tape wrapped round as getting the correct equipment at this time of year is risky with post, and in any case I haven't found anyone that sells it other than TS. I am even considering taking 1mm off the 21mm ZWO sleeve as I have two.
This is an hour I grabbed last night with the 183MC at 20x3min subs with darks and flats.
Alan
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Beautiful shot of one I started last time out, at least seeing this I realise mine has a long way to go.
Alan
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Superb shot, so much to look at and for in this shot, Thanks for posting.
Alan
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Lovely shot, how different it looks to my OSC image from last time out, I could well require a lot more data as I was cut short by cloud. This looks really nice and I like it a lot.
Ala
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1 hour ago, Adreneline said:
Hi Alan,
Thanks Alan - I'll go in search and see what I can find.
My basic RGB subs don't seem to contain that much colour - probably because they are so short (10s and 30s). I tried using ArcsinhStretch in PI and that introduces lots of colour but the stars all look a bit untidy and ill-defined. By the time I've restored the star shapes most of the colour seems to have evaporated away again so that when I come to layer them into the NB image it is very hard to see any real difference. I've also used basic HistogramStretch on the RGB image but again the colour is not really there and by the time it starts to show the stars are all getting a bit bloated.
It's all a bit of a challenge. I think I favour little stars with a lack of colour to bloated stars with colour.
Adrian
I actually set about trying to invent my own way of reducing stars in PS and got an amazing amount of colour into them, didn't reduce them one bit. Sadly I didn't write down what I did and forgot how i managed it in the first place. I personally think the image you took is lovely, and as said by others framed beautifully. I can't get this wide field with a scope but I always have a battle with Alnitak.
Alan
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There is a star-colour preserving stretch tutorial for photoshop on here somewhere, a bit difficult (well for me) but it worked very well.
Alan
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That is not so good news but if it were to happen to me, there is no business that I feel would deal with you better than FLO, they sent me a spare cable even though I told them it was another fault which no one had ever heard of to do with our electric system which can't actually happen with the UK's.
Alan
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Yes very nicely framed and lots going on in there, lovely dusty areas!!
Alan
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I feel your being a bit hard on yourself, this is a very good image, Nikon lenses are I am sure as good as my Canon lenses, my only gripe about using them is the spikes, though I have to say yours seem nicer than the time I used my 300mm f2.8.
Alan
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Interesting read, see I need to look at APP or PI, maybe after Christmas.
Alan
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Not cleaning as such but I was amazed that my guide scope was still guiding fairly well when it was frosted over the other night, dust shows how little effect a bit of dust a stuff has on things. I have cleaned my front corrector plate of the Sc as it had a little oil or grease on the inside caused by adding a piggyback scope rail. Apart from that I don't think I have touched any of mine, eyepieces got more attention maybe.
Alan
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That come out very well Mick, it was one of the first things I tried with my 12 inch Sc and a Canon camera on the fork, doubtless to say it should not to mentioned in the breath as nice work like this. It also pretty much heads my list of most disappointing visual targets, even through fairly large scopes.
Alan
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I never had a chance to try either but both were very rare and I can't ever remember seeing a S/H 30mm and on only once a 40mm. I am sure they were both good eyepieces though for me the shorter end were at the very top of the game.
Alan
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10 hours ago, wxsatuser said:
The 7704 has a back focus of 55mm, the ZWO 071 has a back focus of 17.5mm.
You need a spacer of 37.5mm between camera and reducer.
I completely misunderstood that then, but it would explain why removing the 16.5mm ring to give 38.5 has given me something of a result, I will have to see where I can get such a set of fittings from.
Thanks for your help at least I understand now.
Alan
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Well with the thick spacer in place and the Zwo set with spacers for 55mm the telescope will not reach any focus, even though the instruction state 55mm, again when I removed the 16.5mm Zwo spacing tube focus was achieved but stars were still slightly out of shape at the very edge.
Something small is wrong here and I can't see what, can't believe I have bought a lemon, I though Borg was quality stuff, appears people have taken some very lovely images with their equipment. There is just so littl infomation about anything.
Alan
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I prefer the first image and don't much like the starless version, it's a very large target this one, one which I hope the Borg can capture soon, if I get the spacing sorted.
Alan
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Keep looking at this myself but the more I read about some of the other filters the more confused I get, seems a very good result considering the Moon.
Alan
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On 07/12/2019 at 08:54, wxsatuser said:
Well Mike I have put in the wide spacer and set the ZWO spacer rings at 55mm and we will see how we get on. I was rather surprised I got a sort of reasonable image at 38.5mm, maybe with being short F/L the jumps to get it right are not so critical as they are around 800-900 where 1mm seems to be fairly important.
Looks as though it will be clear for a test tonight.
Alan
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Just now, alan potts said:
Your hard to please, it is a superb image that I feel anyone would be happy with.
Alan
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You hard to please, it is a superb image that I feel anyone would be happy with.
Alan
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15 hours ago, gorann said:
I have te same reducer (if it is the 0.79x 3" version from TS) and have been using it on my Esprit 150 with the ASI 071. I also worried about the filter and TS told me that I needed to use a fliterslider as David did. However, I have been trying without a IR/UV filter and I actually do not see much star bloating. My main problem has been spacing. 55mm gave very long stars in the corners, and so did 54 (marginally better). Last session I tried 53 mm and it was better but still not good. I will try 52 mm next time.
I actually seemed to get different results from this reducer even using 55mm and I am assuming the spacers with the 071 do give me 55mm. When I used my Canon this gave very good results and this too is or should be 55mm. With the scope F/L at 805mm I did wonder if the spacing should be a a little less as with scopes of smaller F/L the figure goes up, I.E. 58mm quoted at 600mm. I did try it without and can't say I saw much different at all but with the moon about my choice of target was a bit washed out.
The trouble with the filter slider in my view is it is just too damn expensive for what it actually is, I think I would rather buy another scope and have something to show for the outlay, as I had some sort of reflection issue with the reducer that I never found an answer to, it just went away.
Alaways fancied a 150mm Espirt, should have got one when my friend and local dealer offered me one for 3500e, I bought an 18 inch Dob instead.
Alan
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I had dew on me last night, the guide scope had frozen over and oddly still managed to guide. I have to say though I felt cold, must be getting old.
Alan
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I have done this a good few times with various scopes I own, but from a better latitude than the UK. I played a game for a long time, seeing if I could split Sirius from what would be the max UK elevation. Only once managing this on a very good night when Sirius was at about maximum for southern UK, this was with an 18 Dobsonian, so that sort of shows me how difficult it can be, conditions being just about everything.
Alan
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Heart and soul - work in progress
in Imaging - Deep Sky
Posted
Lovely work, from that angle the Soul looks like a Teddy Bear sideways on. I did the Soul last night but I have a spacing issue with the Borg scope that needs putting right.
Alan