Dave G

Thanks everyone for your suggestions. I ended up with a filter drawer which makes sense for future filter use. I think I'll stick with the 2" filter in case I change to a camera with a larger sensor in the future. I guess it makes sense that using a filter to support the weight of a ZWO camera is not the best way to go. It's all a learning process, but I appreciate the advice.

Thanks. The front of the flattener is much too large for a 2" filter. On the back, it's the correct size and the filter screws on with no problem, with the front of the filter pointing backward but, the front of the filter is not threaded so nothing can attach to it. I think the only solution is using a filter tray?

I upgraded my Canon dslr set up and just received my ZWO ASI533 mc pro today. I also purchased a Optolong L-eNhance 2" filter to use with it. I'm using a William Optics GT81 81mm f/5.9 Apo Refractor with the 0.8x flattener. I understand about using the adapters to connect everything, but the front of the light pollution filter is not threaded so I can't connect to the flattener or spacer. I know there are filter drawers that would allow the use of a drop in filter, but I would think there is a way to connect everything together. I apologize if this is astrophotography 101, but it's hard to find anything that explains this basic topic. There is a lot to try and absorb and it's frustrating to run into such a simple roadblock. Thanks in advance for any advice you can give.