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About jACK101

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    South West Scotland

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  1. It is a single image. I am starting to set up an observatory and I have bought the Celestron HD Pro Wedge. I intend to install that on a concrete pier. I therefore did not use tracking, the telescope was on its tripod. I have been a keen amateur photographer for around 60 years so I am more familiar with photographic processing rather that astro. I used Lightroom, adjusting for exposure and contrast then making fine adjustments in Curves followed by a touch of Clarity. Exposure was 1/4 sec at ISO 800. I was using only the telescope lens, the camera lens being removed. I was surprised at how rapidly the image moved out of frame. Thanks Jack
  2. Hi, I am a relative newcomer to astro photography. This is my attempt at the moon on 1st Mar. I had difficulty getting it in frame and by the time I fitted a focal reducer my front lens had misted up. Celestron CPC925 with Nikon D3200 Any suggestions for improvement welcome.
  3. Sorry, It was a Nikon D3200 not 200 Jack
  4. I hesitate to post this, all the rules have been broken, but it is my first DSO. I used a Celestron 925 but with no tracking and a Nikon D200. I do have the Celestron wedge but have not yet got it set up. This result is from 1 exposure of 1 second, no stacking. I realise that the quality is very poor, but I think I know what I need to do to improve it. Processing was done in Lightroom. I would appreciate any comments. Jack
  5. I am planning to build a small observatory with a concrete pier. I plan to use a car brake disc bolted to the top of the pier to accept the wedge. My problem is that I am not an engineer and I need to transfer the Exact configuration of the holes in the wedge mounting plate to the brake disc and then drill and tap to accept the Celestron bolts. Alternatively I could drill slightly oversize and use nuts to secure the wedge. Does anyone have any ideas? Thanks Jack
  6. Thanks for your comment. Although my telescope experience is very limited I have no regrets about buying the CPC925. It is heavy and I can't manage to handle it on my own. I have however overcome that by building a trolley which allows me to move it within the house and I have rigged up a block and tackle which allows me to easily get it onto the tripod outside. I am however planning to build a small observatory with a pier and this will avoid all manual handling.
  7. Yes, I agree with you. This is only my second attempt at astro photography, the first attempt was very similar. Perhaps I need to avoid taking shots of the moon when there are such large expanses of highly illuminated area. Thanks for your comments. Jack
  8. i'm not sure what points you are making. I have been an amateur photographer for about 60 years and I understand hyperfocal distance etc from a terrestrial photography standpoint. I am however very new to astronomy. I don't know if these relationships hold when the lens has a focal length of 2700mm+. I still think that any play in the tube holding the camera is important. The slightest movement here is likely to move the sensor sufficiently out of truth for focus problems to occur. I'm awake now. Jack Jack
  9. I am using a Celestron CPC 925 AND A Nikon D3200 Jack
  10. I took this shot last night, conditions were excellent. In the area of the terminator, where I was focussing, the picture is sharp, but sharpness falls off to the RHS and lower part of the picture. I don't believe that this can be due to a depth of field issue. At the lunar distances involved I would expect everything to be in focus i.e. infinity. Equally, I don't think it can be due to camera shake because parts of it are sharp. The only reason I can think of is the T Mount I am using, which is a cheapo from China. There is a certain amount of "play" when the tube is inserted into the eyepiece holder. This is perhaps exacerbated by the grub screws which clamp from the side. The combined effect of these may well be to skew the camera so that the sensor is no longer at right angles to the light coming into the camera. This, I think, could explain the symptoms. My questions are , Is this a reasonable assumption? and can I improve this by buying a more expensive adapter? If so what would you recommend. Thank you Jack
  11. Thanks for your replies. I have a Celestron CPC925 on a tripod at present. I intend to buy the HD Wedge and fit the telescope to a pier in an Obsy which I have yet to build. I did not want to commit too much until I was sure everything would work OK. Jack
  12. The site I use at home is open only to 1 quadrant of the sky from East through to just a little beyond South. I would like to try astrophotography, but I am not sure if I can do a satisfactory polar alignment under these circumstances. Can anyone clarify? Thanks Jack
  13. I am thinking about building a small obsy in my back garden. I have trawled through quite a number of previous posts on this topic and have gleaned a number of ideas which I would like to incorporate and some that I definitely don't want to incorporate e.g. the instance when the roof blew off is something I will try to avoid. I have checked with my local planning department and I do not need planning permission for what I have in mind. I would welcome any points that anyone cares to make to ensure that I am moving in the right direction and avoiding potential problems. What I have in mind is the following: A building of roughly 2m *2.5m. It should be large enough to accommodate 3 people at times, plus chairs/stools and a small desk or work surface. Concrete footings for a single run of bricks. Footings or 2" thick concrete over entire floor surface to support chipboard floor which will be laid on a waterproof membrane. Screwed rod to be fitted to footings as they are laid and providing anchorage for 3 x 2 plate on top of bricks. Stud partition walls with exterior plywood (or other suitable material ) cladding, height internally 6' (I am 6' in height) I want to keep the profile of the structure as low as possible to minimise wind loading but also to minimise visual impact. Finished structure will be painted in darkish colour. Roof, with reference to the example where the roof blew off, I did originally plan to make it as light as possible to make it easier to move, but I think a heavier structure might be safer. Therefore a timber, probably 3" x 2" frame with corrugated steel surface. This will have to be insulated to minimise condensation. A track on either side for roof castors to run in. The roof will only need to roll about 1m to allow access to the area of sky I plan to use. The corrugated steel will extend 6" beyond the walls to minimise water ingress. The obsy will face due South and will have an available horizon from South round to East. There are trees very close on the West side which makes a Westerly view almost impossible, but does have the benefit of providing quite good protection from the prevailing winds. I will still have the use of my Celestron tripod to use the scope away from home. The top section of the Southerly wall will hinge down to allow the use of the scope. The South Eastern top section of the wall will hinge backwards to allow access to Eastern sky. I will probably leave the South Eastern corner stud supporting the walls and roof in place and just accept that it will slightly impede my view at times. The roof will be operated by a manual trailer winch which will be anchored to the back wall. Stops will be fitted to the track to stop overshoot of the roof. The roof structure will also incorporate a timber structure to keep it "captured" so that is another precaution against blow off. When obsy not in use the roof will be tied down at the 4 corners using either toggle clamps or rope tied to cleats. I also intend to build a pier to carry my Celestron CPC925. This will be conventional concrete construction, as large as I can manage. The soil is sandy and drains readily. I like the idea I have read about in another post for using car brake discs as a top plate and I will investigate that. My original idea when I started taking an interest in Astronomy was to get into Astro photography. I have been a keen amateur photographer all my life. Looking at the equipment required to get the best results is putting me off this idea and I think I will concentrate on using my DSLR a NikonD3200 to its limit first of all. This raises an issue which has an impact on the design of the pier. i.e. Do I need a wedge? I need to decide that early on because it will have an impact on the height of the pier. Bearing in mind that I am trying to keep the overall height as low as possible, this could prove embarrassing if I can't get the pier assembly into the overall height of the structure. The Celestron wedge is quite expensive and I wonder if I am using this from 1 location only do I need an adjustable wedge or could I get someone to weld up a structure designed for my latitude? Would this work out cheaper and would it be effective? I plan to shutter the concrete of the pier and embed screwed rod to accept whatever top Plate I end up using. I would then clad the exposed part of the pier within the building in an attractive timber. There will be no windows in this structure and the door will be as strong as I can make it, therefore it will not be immediately obvious that there is expensive equipment inside. Is it best to rely on anonymity or to put a visible alarm outside which then broadcasts that there is something valuable hidden in there.? Also the height of the building will make it impossible to put any alarm out of easy reach. Thank you if you have had the patience to reach this point, and I welcome any comments that anyone may want to make. I feel it is best to get as many issues sorted out before starting on such a project. I will keep you posted, but progress will be very slow due to my current health. Jack
  14. Mike, I am also thinking about the design of a small observatory that I would like to build. On this topic I found item eBay item number: 400855884979 which is a manually operated winch for about £12 new. I have no experience in using one of these but I think it is worth a look. Most of them seem to use wire cable, but some have webbing straps. Hope you get a suitable solution. Jack
  15. Roy, Thank you for your reply. You have a difficult task and only you and your dad can sort it out. I hope you manage to do that so that you can reduce the worry that this must be to you and also improve things for your dad. All the best. Jack