BACHES Echelle Spectrograph

Best solution for this problem is using this adapter screwed on the Bino:
https://www.baader-planetarium.com/en/baader-2%22--t-2-nose-piece-and-camera-adapter-(same-as-used-by-sbig)-(t-2-part-16).html
Then you can let the BBHS onto the tube, also you´re able to mount a glaspathcorrector like this for example:
https://www.baader-planetarium.com/en/glaspathcorrector-1-25x-for-baader-binoviewer-with-t-2-thread-(maxbright-ii-and-maxbright).html
Please take a look to the description for this corrector about the reasons why it should be used.

This will not work. You need the ClickLock 2" 2956100 and unscrew the 2" barrel on the back. There is a 2" inner thread that can be connected with the telescopes 2" thread. And there in between you can mount the Locking Ring, the part 2458270, so that you can arrest the mirror in any direction you want

As written in the product description, these filters are only suitable between f/1,8 and f/3,5. They work with ASI 1600 but many customers claim that due to back reflections of the camera window there are Halos possible with this camera and very narrow filters, especially OIII

You can use every 1.25" eyepiece where the position of the field stop is known. You can find the data in this PDF: https://www.baader-planetarium.com/en/downloads/dl/file/id/357/product/3117/hyperion_universal_zoom_mark_iv_specifications_drawing_and_technical_data.pdf
It depends on the configuration of the Mark IV, how the MPCC must be fonfigurated to be set to 55mm.

For the Canon Protective T-Ring, you need Baader M48 Spacer Ring for MPCC III / Protective EOS T-Ring # 2458405 as described on page 6 of the manual: https://www.baader-planetarium.com/en/downloads/dl/file/id/483/product/3004/mpcc_mark_iii_instruction_manual.pdf

The outer diameter of our 1.25" filters (including the cell mount) is 31 mm.