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Wow so my new scope arrived and I was running through all the different options for guiding. I thought I would share my experience and hopefully other beginners might find something useful from this.
I purchased a skywatcher evostar 80ED Pro with a HEQ5 Pro mount and it came with two green dovetail bars. I already had an ST-80T that I wanted to mount on top but the “dovetail bar” that came with that was a small useless plastic block.
The biggest, most annoying hurdle with this process was that on each dovetail bar, there were metric- and whitworth-threaded holes, with different diameters. What I ended up doing, was taking off the evostar dovetail and attaching that to the top of the evostar scope rings. This was important because this dovetail bar has a slot in it, that allowed me to correctly space the guidescope rings.
I only had two whitworth bolts (fortunately that were quite long and had nuts with them), but I used each of those to attach the dovetail bar to the top of the evostar rings. The whitworth bolts were both cut down to size, and the spare part of the thread was used to attach one of the guidescope rings to the top dovetail bar.
Note that I had to drill out the thread of the ST80 rings, as they were metric threads, where as the dovetail had whitworth threading!
I screwed the length of whitworth bolt down from the top and used the nut and a small washer to tighten it down. For the second ring, I placed it in the slot of the dovetail bar and used a small length of metric thread, that I could then bolt from each side (effectively clamping everything together).
Finally, I attached the dovetail bar that came with the HEQ5 (I think it might be the standard, medium dovetail bar that you can purchase separately), to the bottom of the evostar rings. I think I used the bolts that were originally in the bottom of the ST80 rings to bolt those down, and then added in the lateral screws to make sure the rings couldn’t rotate.
It was considerably harder work than it needed to be but I am pleased with the results. It cost me nothing but time and a bit of effort. I know that the guide rings don’t have adjustment bolts, but at least with the current set up, there is no determinable flex, and with an 80mm scope, it shouldn’t be hard finding a guide star. I am a fan of having the matching green dovetail bars. And I have attached the guide camera and DSLR and can perfectly balance the mount. So overall, a great result.
Celestron C8 XLT + extras and SkyWatcher Star Travel 80 (ST80)
I have a Celestron C8 with XLT Starbrite coatings. Will include the full length base plate, both visual and imaging backs, scope rings, front 8" end cap and the finder scope with it. No box I'm afraid. Optics are good and clean, focal length is huge - 2300mm from memory. This lot would cost close to £1300 new and one with less spec went for £750 on fleabay recently. Might be interested in a part exchange or will let it go for £450 collection only.
Also, I have a SkyWatcher Star Traveler 80 - good optics, used as a guide scope - just the scope itself (does not include the barlow in the photo) - now including dovetail bar and scope rings looking at around £50 for it.
I have decided to save up for another refractor, WO, Equinox or even toward an Esprit. However, I would also consider p/ex for an Intel NUC and/or Pegasus Astro Pocket Powerbox.
Please excuse some of the colours - I used my astro modded 6D which was in the observatory so the "nice" purple is actually black !!
Both these are collection only.
By Geordie mc
8 inch Newtonian for visual or astrophotography use. Mount is a good solid unit. Comes with mains and cigar lighter power leads. 28mm 2 inch eyepiece. 25 and 10mm I.25 inch eyepieces and 2x Barlow. Skywatcher coma corrector. Red light torch (needs new batteries). Padded carry case for scope. Skywatcher ST80 guide scope with Skywatcher guidescope mount. Extra counterweight. Azimuth bolts are metal upgrades from Bob’s Knobs. Carry case for eyepieces etc.
Looking for offers around £750 for the whole setup. (Preferred option). But, I would consider splitting the scope, mount, coma corrector, case, ST80 and guidescope mount. Make me a sensible offer.
I would also consider a swap for a one shot Colour ccd or cmos camera for deep sky use. Must be cooled and small bodied for Hyperstar use such as Atik Horizon os asi 533 pro. Tell me what you’ve got and we can work something out if the camera is suitable.
i live in France in the Haute Vienne but am back in the UK at Huntingdon in Cambridgeshire from Dec.20 to 28th. I could leave kit for collection in the New Year if that helps. Collection only please. Payment by PayPal only. Many thanks.
By Adam J
Here we have a clone of an ST80 branded as Helios, 80mm Achromatic F5 objective. (OTA only)
Its not in the best condition. Numerous shallow scratches to the outer surface of the primary being the main issue.
However, my assessment is that its not quite ready for the great telescope graveyard in the sky yet.
The scratches of course will not be resolved when in focus and so it will still work as a guide scope or perhaps something to let younger children loose on without fear of what they might do to your ED triplet.
Its mechanically sound in terms of the body / focuser / tube rings, so perhaps someone can make me an offer on those components for spare parts?
For the whole thing I would be looking for 30 pounds to make it worth posting it realistically, I think that the tube rings / focuser together are worth that as spares parts to someone regardless of the objective.
If you are willing to pick it up from Lincoln then a token amount would be accepted so make me an offer.
I wonder how can I mount the ZWO ASI 60mm Guidescope on the Evostar 72ED (elsewhere than the Vixen Style Finderscope Shoe, because the guidescope seems to be a bit too heavy).
Do I need a Vixen Bar of a specific length ? Or another type of adaptor ?
Is someone using another solution ?