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Topographic

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Posts posted by Topographic

  1. Just completed my modification, no chance to test yet. The mount is about 2 and a half years old and a little temperamental  when guidied. Hopefully controling backlash etc will do the trick.

    A couple of things. 

    When I tried to fit the idlers it turned out that neither hole was actually round. I just used a drill bit (manually) to gently 'round out' the holes. Using the 5.5 mm distance gap for the small pullies was a no go, it meant the lid (with spacer) would not fit. On the RA axis motor the pulleywent as far down as was possible, on dec it was a little higher, this in turn meant the large pullies were a little higher but no problem with that. It would seem to be issues with Skywatcher quality control and perhaps some minor differences in the motor parts used.

    My mount is on a pier (tripod would have been a liability in the observatory), and I replaced the original saddle (useless thing) with an ADM dual saddle (bliss). So the HEQ5 is almost not an HEQ5 anymore. At least this mod and tuning worm backlash gave me a reason to use the handset. Polar scope - used it once.

  2. On 07/01/2020 at 23:35, tomato said:

    I wanted to install a single (1.25”) luminance filter in front of an ASI 178. ZWO offer a threaded collar which screws into the camera body and hence is after the OAG, and has minimal effect on the back focus distance. This is the link to FLO’s page, however I cannot see a 2” version.

    https://www.firstlightoptics.com/zwo-accessories/zwo-t2-to-125-filter-holder.html

    In the end it was easier (and cheaper) to make a simple push fit collar to hold the filter central in the optical train and clamp it in place by the adapter that screws into the camera to attach to the OAG, this might be the way to go?

    This adapter  comes with some of the cameras, ASI183MC in my case, I think it is those with smaller chips.

  3. On 19/12/2019 at 10:39, alan potts said:

    I feel the simple answer is no, I have a 071 too. You can buy a sliding filter holder but the one that I have seen that is close to the correct size is rather pricey at 150odd euros, then you require shims to make up the remaining part of a millimeter, I forget how much. I am told Zwo will be bringing out a 2 inch filter wheel soon but this will again be pricey for, in my case the holding of a IR/UV filter or if I buy one the L-enhance.

    Alan

    £75 doesn't seem bad for the new filter holder.

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