New photos of Sol’Ex aluminium collimator tube and Shelyak collimator lens, ZWO helical focuser and ZWO ASI 174 MM camera showing position of camera which is mounted via 1.25 inch nosepiece into focuser without any gap, and position on vernier.
Although I I used 1.25 inch nosepiece on camera rather than direct connection to focuser via T2 thread, I did not require this time to add in small gap using nosepiece to achieve focus.
Andy
