I recently picked up a 150mm F/5 newtonian and my objective was to image venus with my filter wheels using the Uvenus, R, G, B and L filters with my ASI174mm. This will keep me busy until I get my 16" F/5 in October 2021, which I ordered back in March. I used an equatorial mount with tracking for the reflector and was able to lock in on Venus. I installed the filter wheel and I had the focuser all the way in and it still can't focus on venus, i guess the filter wheel needs to be shorter but I have no way to do that since it's fixed. Is there a device I can buy to install along the light path to make the light path shorter? I need to image with this filter wheel because its much easier, if i do it manually one by one and un-screwing and screwing in the filters individually each time, it will really take out the center focus of venus because of all the fidgeting and movement caused by me removing the eyepieces and accessories to screw in the filters taking the telescope off center view of the planet. Anyone have any recommendations? Will i be having this same problem with the 16" F/5 since both have the same F ratio?
Edited by astroflak88, 10 June 2021 - 11:59 PM.