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lenscap

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About lenscap

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    Star Forming

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    Birmingham
  1. Hi Fraunhoffer, There is discussion on the AstroEQ forum that the Exos-2 has the same worm ratio as the EQ-5. https://www.astroeq.co.uk/forum/index.php?topic=249.0 EQ-5 gear ratios etc can be found here. https://www.astroeq.co.uk/tutorials.php?link=ratios Are you looking to fit an off-the shelf RA drive, or to choose a motor and design your own?
  2. lenscap

    Mount grease

    When I motorised my 20 year old EQ3-2 the motors were stalling so I stripped it down an removed the Synta gunk which had congealed to solid in places. After much research I got a spray tube of "WD40 Specialist High Performance White Lithium Grease" of the sort which is much recommended. In my judgement this is much to thin for the tiny contact surfaces in worm drives. So instead I used some general purpose lithium grease that has been in my garage for about 20 years. Probably the same stuff you have used. This is much thicker than the spray stuff but does not have the grab or the stiction of the Synta grease. It works great, no stalling and I'm sure it will protect the worm drives. Personally I don't believe that only the most exotic & expensive grease will do the job. A mount is not an onerous application compared the the very high loads in automotive applications etc. Just my opinion.
  3. lenscap

    Do 12V sparks damage electronics?

    Thanks for the good advice guys. I will be fitting a rocker switch and a choke in the +12V line.
  4. My diy Onstep GoTo controller is basically an Arduino Mega 2560 with a RAMPS 1.5 shield, rated for 12V normal, 20V max & uses about 2A max. It is powered from a 12V car battery. The lead has crocodile clips at the battery & connects to 5A screw terminals on the RAMPS. When I "power-up" by connecting the clips there is a spark at the terminal. This is expected, but does the sparking reduce the life of my electronics? If so is there a cheap/simple way to reduce or prevent this? I know I could put a switch in the lead but I assume the sparking would then happen inside the switch, making no difference.
  5. lenscap

    Imaging opportunity - Comet Iwamoto

    If the sky is clear here on Wednesday the comet will be in the same FOV as some Flying Pigs!
  6. Hi & welcome to SGL. This link is to a pdf of the user manual for a similar Skywatcher scope. It may be of some help. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=2ahUKEwi1obyon6fgAhVBonEKHdRQC1kQFjAAegQICxAC&url=https%3A%2F%2Fwww.apm-telescopes.de%2Fmedia%2Fmanuals%2Fskywatcher%2Fen%2F17.pdf&usg=AOvVaw3bsGctukpZWHMKAzZFb5Dg
  7. Hi Cyclops, here is a list of Doubles from Sky & Telescope https://www.skyandtelescope.com/observing/celestial-objects-to-watch/pretty-double-stars-for-everyone/
  8. SkySafari 6 Plus is great. I particularly like the Scope Control & Observing Lists features. There is a bug when adding observing notes ("Observations") to items on your Observing Lists. If your last entry in an Observation happens to be a piece of predictive text rather than a keystroke, the whole Observation will look OK on the screen, but it will not be saved. It is quite annoying to later refer to an Observation that you carefully entered with frozen fingers, to find that it does not exist! The work-arounds are obvious; - Don't use predictive text. - If you do, make sure the last character entered in an Observation is any keystroke ( [carriage return] or [space] is fine), not a predicted word. - Or you could use pencil & paper, but where's the fun in that? SkySafari 6 Plus, version 6.1.0.34, Android 6.0
  9. lenscap

    Catching carbon.

    Have a look at 19 Pisc. It's quite bright at 5th Mag and is a deep cherry red to my eye. And it has the most fantastic name . . . . Torcularis Septentrionalis !
  10. lenscap

    Erm, any thoughts on this mount?

    Strikes me that the slo-mo controls are not very slow. The drive ratios seem to be about 4:1, whereas the worm ratios on an EQ3-2 , for example, are 65:1 and 130:1. What are the slo-mo ratios on the SW AZ mounts? Is 4:1 much use?
  11. " I've been monitoring their ' Television ' transmissions Captain. I'm afraid there is no sign of intelligent life here "
  12. lenscap

    Super Blood Wolf Moon from North America!

    Icicles? Ouch! Just as well you didn't have to attend to a call of nature then!
  13. The Der Spiegel article quotes 3 "reasons" why it might be ET. - It came from outside the solar system - (so what?) - It is not spherical - ( must all rocks/ asteroids/ comets be spherical? ) The third is more interesting. It refers to a paper in Nature which says that the orbit was significantly non-gravitational. Here is a link to an abstract of the paper. https://www.nature.com/articles/s41586-018-0254-4 As I read it , the paper concludes that the non-gravitational aspects of the orbit were consistent with comet-type outgassing. I rest my case.
  14. Hi SloMoe, This is from the SkySafari manual; "A note on accuracy: the solid-state compass built into most mobile devices is not very accurate, and easily affected by interference. It can easily be wrong by ten degrees or more. The compass may be useful for locating bright objects in a general part of the sky, but it's certainly not accurate enough to point a telescope." A couple of years ago I tried using an old Samsung Galaxy Ace running SkyMap as a finder on a small Newt. It was not accurate enough to put a target in the Finderscope, never mind the eyepiece. But that was if the phone was held well away from the (steel) scope. If it was within 18" of the OTA it was much more inaccurate. If it was mounted on the OTA you could slew 90 degrees without the phone display changing! I abandoned the project. Of course someone may have found a phone with an accurate , interference resistant compass, but I don't know of one. Clear skies!
  15. lenscap

    Turn Left At Orion alternatives

    If you go to the TLAO website; https://www.cambridge.org/turnleft and click on the target you want to observe, you will be offered several scope/ finder views. Choose "Binoculars - Northern Hemisphere" which will be the same view as your RACI Finder. (assuming you are in the N hemisphere)
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