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Posts posted by Topographic
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Quick example of Optolong L-eNhance image. Cygnus Loop, RASA8/Zwo ASI071MC Pro. 158 x 40" Gain 95, 80% Moon
My reason for using the filter is just for Moon compromised nights as I am in Bortle 3 and get great definition and colour with an OSC.
This was developed in StarTools using 3 channels in the Compose mode and RGB:RGB preset 'colour' with minor adjustment.
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The 2" filter slider replaces the 21 mm T2-M42 extender between camera and OAG/16.5 mm extender.
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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.
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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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I prefer not to have to buy another flattener. But may have to.
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The question for me though is, can you get focus with the skywatcher flattener and ZWO (or other) ccd/cmos cameras?
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Looking at the entry for the rotator at First Light Optics it is
"Only fully compatible with the Evostar-72ED OTA (shortened tube version) shipped from December 2019. Earlier versions of the telescope may not reach focus with some cameras when using the rotator."
Do we know which cameras, or which makes of camera?
I can't find anything about a new version?
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On 29/10/2019 at 17:11, StarlightHunter said:
Just to add more information to this flattener thread, it has a 2" thread on the telescope side so you can screw filters on it.
Rowan belt fitting
in Discussions - Mounts
Posted
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.