HELP! I have read the celestron white paper on the RASA11 ..but now the maths headache! If I read this correctly, the adapter plate is 3.5mm above the cuff. The ZWO filter draw is 21 mm, the 2" filter 0.7mm and the 533 cuff and sensor plain is 16mm =41.2mm Does that mean I need 31.6mm spacers to get to 72.8mm?
or! the back focus on the camera is 55mm. so, do I use the spacers with the camera, + the adapter plate and filter = 59.2 mm deduct from 72.8mm leaving 13.6 mm. and that's the gap I need to cover?
or are both of these methods the wrong way of getting BF with the kit I have?
Can anyone help?
