Quote:
Originally Posted by casstony
The filter should not be holding any weight at all or connecting anything together - I think you've got it in the wrong position. The filter screws into the telescope side of the T-ring adapter, then the adapter is screwed onto the flattener, then T-ring then camera. So the filter is between the parts where the red arrow is pointing.
That's how it is on my Esprit 80 anyway, I assume the 100 has a similar setup.
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OK, that's similar to my set up. The difference ( and I may have got the terminology wrong here) is you have a T ring adapter and I don't. My T ring has a 48mm thread so the filter screws straight on. You obviously have a 42 mm T ring and need the adapter to step it up to 48mm so you can fit it to the flattener. You still have the filter between the camera and the flattener which according to the manual will increase the distance between the camera sensor and the flattener to more than the critical 63mm and so cause the stars to be blurry at the edges of FOV.