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About alanjgreen

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    Cumbria. UK
  1. alanjgreen

    Eyepieces for f4.7 dob

    Second hand is a good choice. You can always resell them for what you paid for them. Just be sure to keep the end caps, manufacturers box and packaging as without this the price you can get will be reduced.
  2. alanjgreen

    Eyepieces for f4.7 dob

    At the risk of repeating myself, you wont go wrong with these excellent 100 degree APM/Lunt eyepieces, around £200 new. Unless you wear glasses to observe, the eye relief of 15mm is probably not enough for glasses wearers. https://www.apm-telescopes.de/en/eyepieces/more-74-ultra-wide-angle/apm-lunt-eyepieces.html If I didn't have a case of Televue Ethos and was starting new then these are nearly as good for half the price! If you want to spend less then the ES 82 degree would be fine. A big manual dob needs widefield EPs, personally I do not consider 60 degree eyepieces to be widefield (maybe they were 20 years ago!). If you ever look through a 100 degree eyepiece then you will know why we say that "50 degrees is like looking down a straw" Alan
  3. Argh, its upside down & reversed compared to my view :( Not sure you will see the "horse" very easily in this reversed image. You got the two humps of the "camels back" (7 o clock position). In the dob view these are at 12 o'clock above the horse (at first it looked like a "jockey" on the horses back. The horse's head is buried in the "bright area" at the bottom and can just make it out. The black body is running away vertical in your image towards the double star. Still, pretty decent view considering your location.
  4. Nice image. If you can imagine the brightness turned up by about x20 then that's what I get with big dob and NV (from my darker sky location which does make a difference - I do not buy into this theory that NV is only for city based observers at all ). The Crescent really is bright with the 20", especially that claw section on the right hand side. There is lovely dark black detail within all this bright nebula section. The whole thing takes on the appearance of an inverted number 9, which is just coming through in your image. - The Crescent also delivers well in the Borg89 too, it really is a winner in any scope with NV but the extra scale gives the finer details of course. Give the Wizard (NGC4380) a try next time and see if you see the "horse". Also don't forget the Bubble with the C11 - that should be good too at the higher magnification. The other thing that may be interesting to do would be to get images of the same object using all your scopes then you could publish a scope by scope comparison/medley all taken from the same observing site? Alan
  5. Marcel, The skywatcher website says your scope is shortened for astrophotography use - The new Sky-Watcher BKP 200 OTA Dual Speed incorporates superb mirror-set with two significant advantages. A Dual-Speed 10:1 ratio focuser is now included for excellent focusing precision. Also, the tube length has been slightly shortened to optimize performance for prime-focus photography. Even better performance for astrophotography and visual use can be achieved when used in combination with Sky-Watcher’s Newtonian coma corrector. Can you get any eyepiece to work? Is there an EXTENSION TUBE in the box? If so, then you need to put this tube into the focuser, then put the paracorr2 into the extension tube, then put the eyepiece into the paracorr2 You may need something like these to reach focus with an eyepiece http://www.televue.com/engine/TV3b_page.asp?id=92 https://www.firstlightoptics.com/adapters/tele-vue-extension-tubes.html https://www.firstlightoptics.com/adapters/moonlite-15-focus-extension-tube.html https://www.firstlightoptics.com/adapters/baader-2-clicklock-clamp-37mm-extension.html HTH, Alan
  6. alanjgreen

    Nexus manual go to system

    1) Is the Nexus system available for purchase in the uk or Europe and could you provide a link and current price please. If it's only available to purchase from the states, are there any problem with purchase,postage,import taxes customs ect and what would likely be the problems encountered and the cost of such extras. Alan> You need to buy it direct from Australia. I did this and no issues. You have to pay UK customs charges. It took just over 1 week from order to delivery at my UK address 2) my understanding is that you load the Nexus software and something like skysafari on a tablet or phone. Does this phone or tablet need to be an iPad,i phone or can it run from an android device. What screen size would be advisable and what are the minimum operating spec of phone or tablet to be able to use Nexus and skysafari or similar. Alan> No this is incorrect. If you use sky safari then no other software is needed. Nexus do make an app but this is instead of sky safari rather than "as well as" 3) I understand there needs to be two encoder type of devices fitted to the dob mount. Do these need to be drilled or can they be put in place by those extra strength sticky pads (similar to telrad pads). Do the position of these encoders need to be very accurately applied and at a certain angle. Alan> David Lukehurst installed mine. Yes you need to drill. Accurate angle = no. Encoders just sent clicks to the Nexus unit as you move the scope. If you buy 10K encoders then this means that a 360 degree circle is 10,000 clicks. Any fraction of that circle can be calculated based on the number of clicks. Nexus basically just sends this click info to sky safari and sky safari plots out the movement on the screen. There is nothing clever to it really! You can buy encoders with different numbers of clicks 8K, 10K, 32K. The more clicks the more accuracy and the greater the price. 10K encoders are plenty accurate if you dont want to spend on the latest 32K encoders. Mine are 10K encoders and I have had no issues. 4) I take it the signal from the decoder to the tablet/phone device does not need an house type wi fi box to be able to exchange signal, therefore can be used in the field without any problems so to speak. Alan> The nexus unit generates a wifi network. You connect to this network with your phone/ipad. You need to stay in range of your scope to pick up the signal. 5) As i do not want to be messing about setting up the scope position , time ect ect ect ect(I think you get my drift here) do you need to get the dob base level, set times ect. Or is it just a matter of getting the dob out ,switch on the phone , switch on decoder and away you go. Obviously you probably have to locate and position some stars. Alan> You turn on Nexus, connect the ipad to the network. Choose a star in sky safari then point at it, click "Align". Choose a 2nd star in sky safari then point at it, click "Align" = Done. 6)As I am considering using this system on a OOuk 14" has anyone fitted the Nexus system to one of these and how easy was it to fit and run the system. And how effective and accurate was the system, is there any downsides that you can let me know of . Alan> None, its brilliant. I have been using mine for 18months now with no issues. Here are some links: Firstly, here is the Nexus that I use http://www.astrodevices.com/Products/Nexus/Nexus.html http://www.astrodevices.com/shop/index.php?product/page/6/Nexus (I picked this one because it runs on 12V and I needed that for my 12V battery, the newer unit runs on 5V so this may or may not be a problem for you?) AstroDevices make and supply encoder kits for many scopes in their shop, here is the link http://www.astrodevices.com/shop/index.php?catalog/category/encoder+kits/name/1 Email Serge (the guy at AstroDevices with all your requirements, he will make up all the leads you need and quote you a price), he is a really helpful guy and always answers emails when Australia wake up! HTH, Alan
  7. alanjgreen

    starsense for eq5?

    Celestron makes two versions of Starsense, one for Celestron mounts and one for skywatcher mounts. This is the skywatcher version https://www.firstlightoptics.com/celestron-mounts/celestron-starsense-accessory-for-sky-watcher-mounts.html https://www.celestron.com/products/starsense-autoalign-for-sky-watcher-mounts if you read the text it states which skywatcher mounts are supported. Here are the extra manual pages for the skywatcher version https://www.bintel.com.au/wp-content/uploads/2018/02/celestron-starsense-94006-addendum.pdf Alan
  8. alanjgreen

    The night of the small scopes

    My big dob lets me get to smaller faint nebula pretty easily but again that's with the 55mm plossl at x38 magnification. It's hard to explain to a non-NV user just how much nebulosity there is! I switch to my Borg for alternative views of the larger stuff and low horizon stuff. Objects like the Crescent are much better in the dob than the frac so it's not a case of larger targets only. The bubble and elephant trunk have been awesome plus too many others to mention... Not had much success with planetaries and NV as peterw says. But with all the great nebula that come within your grasp I am sure planetaries may be less interesting overall. For planetaries you need a big dob where you can throw x400+ at them with an O3 filter. Once the thrill of all these NV red objects stars to wear off then at least I could mix it up with my big dob for some planetary nebula fun with traditional eyepieces but soon the galaxies will be back and I will only have eyes for them if you like Galaxies then it's amazing to see Hicksons at only x38 magnification. Almost unbelievable and they are not large targets! Alan
  9. alanjgreen

    Eyepieces for f4.7 dob

    No other manufacturer states f4 compatibility as far as I know
  10. alanjgreen

    Eyepieces for f4.7 dob

    All Televue eyepieces are tested down to f4. All ES eyepieces are tested down to f5. Those APM 100 degree eyepieces are great in dobs and well priced. The 5mm is on sale at 199 euro at the moment on the APM website - I am tempted myself on that offer...! The problem with the 50 degree plossls is that it will be like looking down a straw and if your scope has no tracking then you will be manually nudging continually. If you buy wider 82 or 100 degree then yes they cost more but much less nudging needed and the usage of them is so much more relaxed
  11. Hi Marcel, I am not familiar with your scope, internet search says it is 200mm aperture, 800mm focal length so f4, is this correct? Can you use (reach focus) with the Delos on its own without the Paracorr2? - your scope may be intended for imaging and you need to buy an extension tube to put into the focuser for visual use If your scope is one of these https://www.365astronomy.com/lacerta-200-800-photo-newton-reflector-telescope-with-octo60-focuser-w-carbon-tube-carbon-tube-made-in-germany-assembled-in-austria-package-with-4-lens-gpu-comacorrector.html the description seems to suggest it has some sort of coma corrector already? As far as your questions go... 1. Paracorr2 is for visual use 2. You need to turn the top of the paracorr2 to the correct position (letter) for the eyepiece you are using. Televue provide a table on their website of the correct setting for each eyepiece. I remember the positions are different for the 17.3 Delos and the 6mm Delos. Position "A" for 17.3mm and position "D" for your 6mm Delos. 3. 2 inch filters are screwed onto the outside of the bottom of the paracorr2 4. Paracorr works with all Televue eyepieces listed in the table http://www.televue.com/engine/TV3b_page.asp?id=61&Tab=_ttop Alan
  12. alanjgreen

    The night of the small scopes

    Have a search on cloudynights, the Americans have found a couple of other eyepieces that have similar top surface to dioptrx. The problem is that we are using pvs-14 night vision and the objective connections are limited. The Americans use other types of NVD as well and some of the older models have more flexibility to attaching other adapters. They also use them direct into the focuser (without eyepieces at all). The TNVC adapter and Televue eyepieces is guaranteed to work with the pvs-14 so if you don't want the hassle of failure and messing about then it's the best way forward. I added more photos of the adapter in this thread As Gavin says the real benefit of eyepieces >27mm is that it artificially increases the focal ratio which means brighter image and much more detail in nebula and many galaxy arms. Plus if you know you can reach focus with 55mm plossl then You know you can reach focus with NV. Especially key point for reflectors.
  13. alanjgreen

    My back may change my mind?

    You just need a 4" frac.
  14. alanjgreen

    My back may change my mind?

    As said previously, if you are buying 2 scopes then one should be a frac for nice wide views! The other could be a dob or SCT. But buying a dob and a SCT makes no sense, they do not complement each other at all. If you decide 8" SCT then you still need a frac for widefield views. Feel free to ignore me but why ask if you just ignore what people say? Alan
  15. alanjgreen

    Eyepieces for f4.7 dob

    I would say "no good at f4.7"

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