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Everything posted by cowasaki

  1. Looks interesting and local too. Just need to get the evening off now
  2. It does sound like a great deal of money but if you've earned it why not! I've had a great deal of expensive hobbies over the years and seen people chucking vast amounts at them with £20K motorcycles just for Sunday etc. A scope like that will literally last a lifetime so divided up over say 40 or 50 years it's not that bad at all
  3. Are they the people that drop off piles of books at people's work places and then collect them a week later. Someone said there was an astronomy book the week I was off but didn't say what it was. That's a pretty good price.
  4. I can see one star at the moment I have enough problems with sun light ruining my night time viewing without trying during the day Seriously though, just the obvious one of Venus which is obviously visible quite often.
  5. Firsts are always brilliant It's a good shot, the planets are a beautiful target for imaging.
  6. There are a lot of reasons why the tank might not be working. You need to be methodical and check each in turn. The reality is that they are a very simple device so checking shouldn't be too difficult. You could start by removing the battery and connecting a 12v source where the battery was. Does the device power up and power your scope? If yes then it is the battery. Does the charger give out the correct voltage? Should read 12-14v approx. If you remove the battery and inspect it, what type of battery is it? If it is a lead acid type will it charge from another 12v charger? (Be careful with cheap car battery chargers they are not designed for tiny batteries - You need a 12v motorcycle battery or alarm system battery charger)
  7. I have a load of kit and no idea plus I work silly shifts. Buddying up with someone with the kit might be the answer as has been said. Bins are relatively cheap too.
  8. I hate the "cigarette lighter" plug and socket system. It really is a poor way of doing it. It's just unfortunate that it has become a standard!
  9. There are more accurate algorithms that I have found which I might switch to IF I decide to display the sidereal time as an actual time. At the moment it is just being used as the input to the formula that gives the output as per Richards graph. That figure is then converted to degrees and will be displayed on a circle about 4-5cm across which means that an inaccuracy so small would not be detectable. I do have the information to make it accurate to within a couple of seconds right up to at least 2050 but it just makes it more complicated than it really needs to be for now.
  10. Thanks everyone, especially Richard. Just put it all on a quick spreadsheet till I have the calculations right and can test it but this is what I have so far. It does not take into account Long/Lat and local sidereal time yet but I'll post one later that does. Once this is working I can add it as a little bonus to the astronomy computer device so a quick selection of that menu option can bring up the pole star diagram for alignment. Sidereal calculator.xlsx
  11. The reason I wanted to get the information is because I am building a astro computer from one of the more powerful Arduinos and a graphical display. Full control of a camera etc (already, because I had already designed and built a camera control computer), dew heaters, GPS, voltage regulation for syn guider etc etc etc. As the device contains an RTC I thought I would re-create the graphical display for the pole start locator actually on the device
  12. Thanks, this has helped together with this page on how to calculate the sidereal time.... Sidereal time formulas and spreadsheet to navigation accuracy
  13. Watching dion's video about polar alignment he shows a piece of software called polarfinder which shows a circle and on that circle the location of the pole star. Without using this software does anyone know how to calculate the location angle to find the position around the circle?
  14. I answered without updating the screen.... So I would need to replace the original filter with 2mm glass and buy a clip in filter for astro photography which would not cause any issues because I wouldn't have any lens fitted..... Then for terrestrial shooting I remove the clip in filter and fit either a screw on colour correcting filter OR a screw on filter for terrestrial IR photography.
  15. So can I fit a clear glass cover and keep auto focus working then... Use a colour correcting screw on filter on the front element of the lens or A filter for terestrial IR photography again screwed onto the front element.
  16. I've read that and the web site pointed to by it. Still not completely sure which option is best.
  17. I've just got hold of a 500D and was going to remove the interval IR filter from it. I'm a Nikon Pro user and this is my first Canon which I bought so that I can test my latest invention and also use it for astro work and possibly the occasional terrestrial IR shots. Looking at some sites there seems to be a "clip in" filter place on Canon cameras so would I be right in thinking that I was remove the built in filters and then fit a plain glass plate. THEN fit one of these alternative filters into the "clip in" location? If this is the case then any suggestions for the plain glass filter? I've heard of Astronomik from a US site, are they decent? Once the plain glass plate is fitted which filters would people suggest? I am interested in deep space shots eventually but would love to get some planetary shots first as I build up my knowledge and experience. I will do doing the modifications myself. Any other modifications worth doing on the 500D?
  18. To be honest my memory was playing tricks and I thought it was £49.99 so only £15 more. The device you've pointed out is just as good if you only want a single 12V supply and nothing more.
  19. It converts the 12V DC from the battery into 240V AC that you can then use to power other items like your laptop's power supply. The 240V will not be particularly powerful so you can't start running power tools but it can be handy. Personally the Maplin one looks like a better device for a small additional amount.
  20. It is also 17Ah so the same spec on that front but no invertor, it also appears to have a 12v cigarette socket charge lead.
  21. You would need to have it in the position where the battery is connected to the connections you are using. For these jump start boxes that position would be ON as in that position the jump leads are connected to the battery. IF you take the lead out of the conditioner's box that is designed for permenantly connecting to a motorcycle and fit a power plug to it then it would plug into the charge socket on the power pack and you would use the CHARGE position.
  22. I used to use them with the motorcycles. The power lead has a connector part way down it and the kit includes a crocodile lead that plugs into this 2 way socket and also a lead with bare ends for permanent connection to your bike. You could solder a plug onto this cable.
  23. What is the largest telescope that people have in their observatory? I've been reading the site whilst waiting for a clear night and have seen mention of 20'' scopes but is that the biggest? Just interested
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