alan potts

13 hours ago, teoria_del_big_bang said:

Nice answer, and as I suspected it is not that black and white anyone can give a one line answer to this.

In the very simplest terms then, If my pockets are not bottomless but I have a reasonable amount to spend on an imaging scope (say around £1000), and at this stage I am not after perfection as I am still trying to get to grips with imaging anyway but just want some decent images, would I be right to say I could not go far wrong getting a fairly high end doublet with flattener and that without spending considerably more I am not really gaining much.

I know I have the SW Esprit 100 but it was bought as new 2nd hand at a price I couldn't resist, if I was to progress from the WO73 and to buy new I would probably have got another doublet.  Due to weather and working in China last 8 weeks I have not had a lot of chance to use it yet but my first (and only so far) image seems better than with my WO 73 but I have no real way yet of knowing whether this is the scope or me actually improving my techniques.

Steve

Read with interest Steve, but the only thing I would say is 73mm WO and a 100mm Esprit, not really an apple with apples comparison, the ES is over an inch bigger and indeed a fine scope also more than 100mm longer F/L. I wanted that that scope but you beat me to it by about 2 minutes.

Alan

Been wondering the exact same thing as I sit here for the last week finger at the ready as to whether the 73mm WO doublet or the 71mm WO triplet will fill the gap. I have used a few quality instruments here over the last 9 years from the most costly to the no so. These have included doublets and what I will say is Triplets win on visual with object like Venus. This being one of the most difficult to tame for CA. Though even my 70mm Ed gives a reasonable disc in the centre of field. I am sure though, not having seen them, the best doublets do a fine job and whilst we do not all image Venus and Jupiter and even then try and keep the like of Vega out of view, a good doublet will do a great job. It would be the snob in me that wanted the triplet, though you have to say Carole the Tak family do look very sharp indeed.

Alan

Vlaiv showed me an image a few months back taken with a 180mm Mak at F15, as I was asking about using the one I have. The image was as good as anything I have ever seen posted on this site, whilst I am sure it is not easy at 2700mm and F15, it sure can be done by some with more skill than I can muster.

Nice images BTW but I feel a tad too rich in red/orange colour, I feel they would be better a little less saturated.

Alan

Alan

I don't normally like these at all but I have to say this one has a real something about that I like. Really nice image.

Alan

That is about as good as I have ever seen, great image. Tried the same technique myself with an old 40D but fell short of your level of expertise.

Alan 

It is a very nice image, i like the colours best of all. Spacing I find a nightmare I have two issues with different scopes, Even when you know what you need it seems far from easy to actually get hold ot the bits and understanding the mass of different thread sizes only adds to the confusion.

Alan

2 hours ago, jetstream said:

Thanks Alan, yes I've seen the extra 2 inner stars at times and another session revealed a star just outside the trap which I think to be H1 or H2. I find these stars to be seeing and mag sensitive and the odd time that great seeing and transparency coincide sure helps on these stars. The 17.3 Delos with the Paracor II is a big asset in this telescope on the trap under avg conditions and under better ones the Docter 12.5mm/10 Delos/orthos are the ticket.

I'm puzzled why there is not more consistent views of these fainter stars, it must be seeing and or cooling issues. Have you noticed this Alan?

Great to hear, never seen them myself even though I tried a good few times, there is H1 and 2 and I believe, I 1 & 2, though I am sure these are very difficult but worth trying for. I firmly feel all of these E&F are Mag and seeing sensitive, though on the brighter ones more mag I feel. Personally I have always found E and F fairly straight forward, even with my 115mm APO. Few people seem to have seen G and H even though they are within the compass of my 18 inch. This I must get out again, I stopped using it completely due to firstly not being able to go out in the very cold because of a prostate problem and I just got out of using it in favour of photography. Now I have had an operation and recovered the cold is not an issue, must get it out, seems a shame and waste not to.

Alan

Nice report Gerry, have you tried the extended alphabet on the the trapezium yet H G etc.

Alan

Stunning image and a strange galaxy this one, never seen it like this as far as i recall.

Alan

Not as sharp as you expected, I cut my finger on it!!, Great image, 34 hours I don't think I could do that if paid, cloud isn't playing ball here at the moment and it is strangely warm for this time.

Alan

Never seen that one before, thanks for sharing.

Alan

And there was me worrying about using my 071 with a 330mm Borg scope, a stunning image indeed. Interesting what you say about ice, I had troubles with cooling too quick, been fine since I slowed down a bit.

Alan

Looks very nice indeed from where I'm sitting.

Alan

Yes great pictures and a nice way to present them.

Alan

Shot this the other week and was not so impressed with the effort after 90mins at F7, but using another scope at a faster F4.3 I was surprised how much more was there and will try and add to it. This is just an hour with the Borg 77EDll, which is not spaced correctly yet but reasonable. I used that old wonder material, duct tape. This is 20x 3 mins on a 183MC and not very well processed in PS.

It may well not even be focused well, I hate this focuser and wish I knew where I could get a Feather Touch that is if  one works with this reducer.

Here is the 90mins with a 071 and 115mm apo at f7

Alan

Beautiful and one I have never seen before.

Alan

I feel the simple answer is no, I have a 071 too. You can buy a sliding filter holder but the one that I have seen that is close to the correct size is rather pricey at 150odd euros, then you require shims to make up the remaining part of a millimeter, I forget how much. I am told Zwo will be bringing out a 2 inch filter wheel soon but this will again be pricey for, in my case the holding of a IR/UV filter or if I buy one the L-enhance.

Alan

9 hours ago, astro mick said:

Thanks Alan.

Yes we do often neglect these lovely objects.Good luck with M45,cant wait to see.

Mick.

I have not sorted the spacing on the Borg 77ED yet and the edges are a little out of shape, they are also very difficult to focus in my view with that Helical type focuser, don't much like it.

Alan

Very nice image Bob, nice star colour and a rarely seen target, I can't recall it this year.

Alan

1 hour ago, astro mick said:

HI all.

Had a short window last night,as high cloud soon started rolling in.We are always battling the cloud.

I thought I would have a go at a star cluster,something I rarely do.Gemini was starting to show its face,so I chose M35.I took two sets of images,one with my usual ED80/Atik 314L+,and another set using my old WO 66 with a 1000D canon.

For both sets of images I took about an hours worth at 450 secs duration.

The WD80 was an RGB image only.

Bias,Darks and Flats  were applied.

I do like star spikes so I added these to my DSLR image,sorry if you do not like them.

Also it was pretty cold.

Image 1 is the 1000D and image 2 is the ED 80

Mick.

 

 

Nice shots, when time is short star cluster so many times come to the rescue, I'm doing M45 now fully expecting cloud.

Alan

4 hours ago, spillage said:

I am sure you will find the sweet spot. I have found that going over in both directions has given me a better idea on which way to go. I am sure my baader mpcc is no way near the manufacturers spacing but by going a good few mm under and over got me moving the right way and packet of delrin spacers helped me out in the end. 

I understand you reason for waiting and also the time it takes up to get it right. As I do not have a proper observatory I found working outside and due to the UK weather it took longer than it should have.

The only thing I would say is Borg do have a very good name and if the say a back focus is 37.5mm then I guess it will be. Can't say I have had that much luck with the large TS Red reducer on my APO. It is stated at 55mm and seems a tad out, then I can't get a IR UV filter into the light path without spending rather a lot for what it is. The Borg is with it's own reducer not a 3rd party so it should just be a case of getting it right. Still finding focus a pain though. At least mine is in an observatory, though this scope looks rather silly on the CEM 60, it was a good job I didn't get the 120 version that i almost did. I feel the Borg has a good scope in it though, just a case of digging it out.

Alan

Two of the 7 sisters Ron, make a nice crop the way you have done it. I was looking at doing this last night but the camera is in the wrong orientation to get it all in and I couldn't be bothered to redo flats. I feel square sensors is the answer, or round ones.

Nice image!!.

Alan

I have seen a number of very bright flashes from these type of satellites mostly low down towards the south/ south east over the years. I use to see them more than of late but I did see one a few weeks ago. You dont see anything before or after in way of a reflected light just the flash, they seem to travel mainly south to north.

Alan

14 hours ago, spillage said:

Might be worth running some subs through ccd inspector or maxpilote. This should help show any tilt.

I will after Christmas seek the correct sleeve to give me the 37.5mm. As it stands I have the Zwo 21mm sleeve in the mix so finding a 20mm one should not be so difficult, it's just with it being a difficult time for the Post. I find it difficult to understand that even maybe 0.1-0.2mm can make so much difference.

Thanks for you help.  Alan

2 hours ago, spillage said:

I'm certainly not an expert but I would say it needs to increase just a little.

cheers

Thank you for that, I fully see it is not easy to see the elongation as I also feel I have induced a very small tilt into the image plain with my half baked idea. Seems to me with this scope everything is the tiniest adjustment, not easy at all.

Alan