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  2. Hi David. POTH (Plain Old Telescope Handset) is more of a developer tool, think of it as a mail sorting office with the added benefit that you can read and rifle through the incoming and outgoing messages and only choose to deliver the messages you think fit. With logging enabled it is a great resource to help with ASCOM driver development etc. There is no reason for you not to use POTH it is just more difficult to set up when presented with all the capabilities that POTH has. You will find a help document for POTH under All Programs > ASCOM Platform 6 > Scope-Dome-Hubs > POTH Help. To use it for your purposes you make no changes to the options in the POTH control window, all settings should be left at default but rather, in the client program(s) APT, Stellarium etc you have to choose in setup POTH as the Telescope, and optionally, POTH as the Focuser, & Dome. Each time you make a selection of POTH in the client program as the device being connected to, the POTH setup window will open where you choose the actual telescope driver, EQMOD in your case, and optionally focuser and dome drivers if used. You only need to set up the actual device hardware drivers in POTH once, so if you open APT and choose POTH, set up POTH for the EQMOD driver, focuser driver and dome driver, if applicable, then in Stellarium Scope just set POTH as the "Telescope" there is no need to repeat the actual device driver selection again as once selected in POTH it will be the same for all client software connecting to it. To use POTH you do nothing other than connect to the "Telescope" plus "Focuser" & "Dome" if used, in the client software which will then connect to POTH and POTH will relay the messages back and forth between hardware device and client software. Do not try to manually connect to the Telescope, Focuser or Dome from within POTH unless you want to actively test the ASCOM drivers etc. When used for actual mount control, when you connect to the "Telescope" (POTH) from inside APT and Stellarium Scope the POTH window will launch, you need to minimise this to the bottom tool bar on the desktop, or hide it out of the way on the desktop and do not interact with it at all, however the program, must remain "open" otherwise POTH will not work and your client programs will have nothing to connect to. As an alternative, the ASCOM "Generic Hub" does all the above but without the developer tools and log tracing that are included with POTH. Setup and use of the "Generic Hub" is exactly the same as it was for POTH and you will probably find it does everything you need with less user "options" to get in the way. HTH William.
  3. Hi welcome to SGL from Peter in Bedfordshire
  4. I thought that exit pupil eyepiece (not scope's) FL in mm divided by scope F ratio? Is that what you meant Olly? Or have I got it wrong? Steve
  5. Hi welcome to SGL from Peter in Bedfordshire
  6. Hi welcome to SGL from Peter in Bedfordshire
  7. Hi welcome to SGL from Peter in Bedfordshire
  8. Hi welcome to SGL from Peter in Bedfordshire
  9. Pete Presland

    Hello again

    Hi welcome to SGL from Peter in Bedfordshire
  10. Just had a look at it, WOW £88 a bit pricey ! Nice bit of kit though. I think I might seen them at Astrofest last year, didn't realise there was a dual purpose to them. https://www.harrisontelescopes.co.uk/acatalog/baader-skysurfer-v.html?gclid=EAIaIQobChMIgZOogZrm4QIVSrHtCh1ulwXpEAQYAiABEgLIU_D_BwE
  11. Hi everyone, I am thinking about investing in a Newtonian probably a 10" f4 https://www.teleskop-express.de/shop/product_info.php/info/p5647_TS-Optics-10--f-4-ONTC-Carbon-Tube-Newtonian-telescope---fully-customizable.html, Various options exist for the focuser and the coma corrector. I was wondering if the 3" is worth it. Its advantage would be less vignetting and stability? I am planning to shoot mostly using CMOS / CCD cameras that are not that heavy + filter wheel so vignetting on that sensor (close to APS C) should not be a problem. Would it allow for better coma correctors in 3"? Thanx B
  12. I have put this on the Bay as well but I would rather sell it to an SGL member. It's the standard "kit" lens but it's like new with both caps. I can also let you have a lens hood and UV filter for it if you want. This image of Mercury was taken with this lens. It's going to cost about £4 to post so how about £40 all in - is that reasonable? Paypal only by friends or fees paid. UK only. Peter
  13. You can also try using the http://www.astrogb.com/astrogb/All_Sky_Plate_Solver.html cheers Martin
  14. Hiya Glen, no I put the scope in this position to show the clearance between the scope and the tripod legs. There is no fixed park position, thus you can leave the scope as you please
  15. Hi Stu/Super Nova, thanks for the comments. I was really shocked and pleasantly surprised. I won't get my hopes up for it happening very often, because as you say it's rare to get seeing that good, i'm quickly learning! lol. I actually almost got rid of my 3.6mm plassl almost the same night i first used it because due to me being a newbie, and not having collimated my 'scope, when i first tried it on a few stars the view was so dark and blurry. So i assumed i had a dud eye piece! even though i had bought it brand new from FLO lol! i've since learned about collimation, seeing etc. so i know better. For your information, i am on my second scope, my first was a SW 1145p ( 114/500 ), now i have a SW 130 eq2. ( 130/900 ). I'm 5 mon ths in to my new hobby. It's beyond amazing and i only wish i had got into it years ago!
  16. Quite. It's not clear if that's down to the author of the piece or the architects. If the latter then I think it's abundantly clear that they have no business designing an observatory. James
  17. Vixen High Resolution (HR) 3.4mm eyepiece. Beautifully built and NO undercut! I've been getting some very nice higher power views of doubles lately, and I think the FS128 can go higher with the right eyepiece. I just had to try this beauty, courtesy of Mike (iPeace), and wonderfully packaged as always. It's like new. Thanks Mike! This will give me x305 native and x489 with a 1.6x barlow nosepiece on the odd really steady night. I also have in mind more Lunar viewing and Jupiter/Saturn later this year Dave
  18. Just a quick progress report on the results of a first experiment with 'potentially-live' LRGB using LAB colour manipulations. Still some way to go and the whole process needs a lot of fine-tuning. The reason I'm using LAB is that it does allow easy separation of luminance and chrominance and seems to do the job of preserving hues regardless of stretch etc, which isn't easy to achieve in RGB space. (I've never used Photoshop but I believe it does everything in LAB internally?). The L component comes from those subs captured with a clear filter, plus synthetic luminance from the subs collected with RGB filters (there will be various options on whether to use synthetic luminance and how to combine with real luminance, but I wanted to test the full monty). All the black/white point setting and stretching is then applied to this 'total' L component. The RGB are individually stacked, then gradient removal applied, background subtracted, and combined using a colour-balancing approach based on equalising the brightness of a bright feature in each channel. This is a poor man's G2V technique for the moment but is said to work well 95% of the time. The RGB channels are then transformed to LAB space and the L channel thrown away and replaced by the total L component (the one which has been stretched). That delivers LRGB. But the interesting bit is to then change the chroma saturation using simple manipulations of the A and B components. This is what I'm showing below. Obviously one wouldn't necessarily go so far in saturation normally, but it is interesting to see it at work. One thing you can see in the high saturation case is the appearance of rings on the brighter stars. The centres were probably saturated in the original subs but in any case the effect can be ameliorated by smoothing the A and B components (like binning but preserving the original image dimensions). This is done in the lower right image. What I haven't yet done but I think is needed is to align the different colour channels separately as one can see the rings are somewhat offset from the centres. The main reason for doing this pilot is to see if it can be done in real time as there is a lot of computation just to do something simple like alter saturation. It looks like for Lodestar sized images the manipulations can be done in under 200ms on my 2015 MacBook Air, so that is useable. Obviously, things like stretching will also slow down when using LAB mode because of the need to convert between colour spaces constantly. The entire process is automatic. All the program needs is to know the filter used for each sub. Of course, the user will be able to control things like saturation and configure other aspects, but if EEVA users are going to use mono + filters then it is important that it can be done automatically otherwise it starts to become processing rather than observing. As always, comments and suggestions welcome -- this is all new to me although I believe it is pretty standard in astrophotography. I'd be particularly interested to find more LAB resources or hear from APers on where the rings are coming from and how to deal with them (within the EEVA canon of techniques!). cheers Martin
  19. I think I shall go for the simplest approach to this and try a sealed chamber for the camera again. I can use a 3D printed plastic adapter ring for the lens to thermally insulate it from the cold camera body and hopefully this may let the lens warm up above dew point. I've concluded that a standard axial fan should not fail from damp air as the motor part will be warmed by the current flowing through the motor coils and the air RH will probably be above dew point anyway. A standard CPU cooler on the hot side of the Peltier TEC may produce enough cooling whilst the warmed air can be fed up into the dome. Clearly this will be less efficient than water cooling but may be sufficient. It's worth a try. If the 60x65mm CPU cooler is not enough I have a heat pipe type with larger fan and cooling fins.
  20. upload the image to http://nova.astrometry.net/upload and this will come back with solved coordinates and an annotated image.
  21. "HK$10M of Astrological Equipment"
  22. Did it help to get that (those) off your chest, Stu?? Dave
  23. I'm interested in replacing my Vixen Polarie with one of these - like the no batteries concept + just seems easier to use. But has anybody got any feedback yet on actually using one please? Graham
  24. Today
  25. Cheers Olly. I'm not sure i ever remembered knowing about this rule of thumb but it's super helpful now that i know
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