Sky Watcher Equinox Pro 80mm OTA

Changing field flattener on Equinox Pro 80mm OTA from Tele Vue TRF-2008 field flattener to dedicated Sky Watcher Reducer Corrector-0.85x/for ED80

I’ve changed focal reducer for the dedicated Sky Watcher one – it came up on AB&S second hand. Reason for doing this is that the Equinox had great difficulty gripping the Tele Vue TRF-2008 field flattener and it kept slipping – this isn’t problem with TRF but rather with this particular combination. New field flattener grips tightly and daytime tests suggest comes to focus but I don’t have far enough away tree to know for sure whether enough back focus so I will find out next clear night……if not enough back focus then I will need to cope with TRF which will focus. Mind you this is the dedicated SW one so it should work!

I have connected the field flattener to the telescope using a bespoke 2″ nosepiece purchased from First Light Optics. I think the end of the focuser tube might unscrew to allow direct connection by screw thread of flattener to scope but I can’t get it to budge and I am worried that I might damage the scope if I try harder to get end off the draw tube on the focuser.

Andy

Calculating whether I can insert a filter wheel between my QHY10 camera and TRF-2008 field flattener

I would like to use a light pollution filter with my QHY10 camera for nebulae as my location is badly light polluted and the situation is getting constantly worse due to new estates and industrial units being built around Lichfield. However such filters are not always ideal for all targets such as galaxies and I would therefore like to be able to move the filter in and out of the front of the camera without affecting the orientation of camera and telescope/field flattener. Doing this would mean that I can take series of flat frames with filter and without filter and then rotate it in or out as needed.

In my previous post, I have attached the instruction manual for the Tele Vue TRF-2008 field flattener that I use with the QHY10 camera.

Here it is again (PDF):

Tele Vue TRF-2008 Instruction Manual

This manual states that the optimal distance from flattener to camera sensor is 56mm.

Teleskop Service do a manual filter wheel for 2 inch filters.

https://www.teleskop-express.de/shop/product_info.php/language/en/info/p9358_TS-Optics-manuelles-Filterrad-fuer-5x-2–Filter.html

The specifications of the filter wheel are as follows:

These show that the filter wheel requires just under 30mm from M48 thread to M48 thread.

However this now means I would need 2 x M48 to T2 adapters, one each side of the filter wheel.

First Light Optics sell such adapters:

So if I used the First Light Optics adapters above then I would add 2 x 10mm into the optical path giving a total of 30mm for filter wheel and 20mm for adapters = 50mm.

Although this appears to be small enough to fit within the optimal 56mm distance from field flattener to camera of 56mm, the page reproduced from the QHY10 camera instruction manual below shows that the QHY10 adds a back-focus requirement of 20mm meaning that the total back-focus requirement would be 70mm when optimal distance is 56mm.

QHY10 camera instruction manual PDF version accessed October 2019

However, if I can find a filter wheel with similar front-back width as the one above buy with T2 threads rather than M48 ones so that I don’t need adapters then it should work OK.

Andy

Improving connection between field flattener and focuser on Sky Watcher Equinox Pro 80mm OTA so that QHY10 camera is not loose/does not fall out

I was very concerned that only one thumb screw on focuser tube for Sky Watcher Equinox Pro 80mm OTA- my QHY10 and field flattener kept becoming loose risking it would all fall out and affecting focus and flats. I was going to drill and tap extra holes for more thumb screws then noticed this hole directly opposite the thumb screw, virtually invisible because it has a grub screw in it. I replaced that with a more robust bolt and now have a very secure connection for my camera that i don’t think will loosen….Just need to take another set of flats now!

Andy

 

Dual mounting bar for Sky Watcher Equinox Pro 80mm OTA and William Optics 66mm OTA

I used my existing bits of mounting gear to create a dual mounting bar for my two scopes today – the idea is that the William Optics scope will act as guide scope once that is set up. For time being I have an eyepiece on it and it is useful for aligning the scope.

Andy

 

Sky Watcher Equinox Pro 80mm OTA + Tele Vue TRF-2008 field flattener + QHY10 camera & William Optics 66mm OTQ with T7C guide camera + TS OAG/flip mirror on HEQ5 Pro & focus points on both scopes with these cameras 20/9/2019

Sky Watcher Equinox Pro 80mm OTA + Tele Vue TRF-2008 field flattener + QHY10 camera & William Optics 66mm OTQ with T7C guide camera + TS OAG/flip mirror on HEQ5 Pro & focus points on both scopes with these cameras 20/9/2019:

     

Focuser slippage in my Sky Watcher Equinox Pro 80mm OTA

Last night I found a significant slippage problem on my Equinox 80.

I have managed to solve this after reading relevant internet resources. There is a small hex screw just behind the locking thumb screw that can be tightened to prevent slippage but this needs to be done carefully and in very small increments to prevent excess pressure causing damage to the focuser tube.

Internet resources:

https://stargazerslounge.com/topic/232789-equinox-80-focuser-problem

https://www.firstlightoptics.com/blog/adjusting-skywatcher-equinox-focuser-tension.html

https://stargazerslounge.com/topic/134026-equinox-80-focuser-adjusting/#comment-1337450

https://stargazerslounge.com/topic/74335-refractor-focuser-slipping/#comment-722461

https://stargazerslounge.com/topic/194211-equinox-80-focus-slippage-problem/#comment-2033890

https://stargazerslounge.com/topic/134026-equinox-80-focuser-adjusting/#comment-1336086

Andy

Photos of my own Equinox 80 today when I adjusted the focuser tension, showing the hex screw being tightened: