https://www.facebook.com/photo/?fbid=10162937615425892&set=pcb.921530480659235 Thanks for everyone's comments on my experiments on fitting an old Canon Tele-Converter to a S30 Pro. The comments on the change in f/ratio was particularly interesting. Somehow I was hoping that the extra aperture would help to balance the "loss" in f-ratio. So I did some measuring (using SAOImage-DS9) of images taken with and without the lens. As can be seen from the screenshots of the results below, a fair amount of light from the 60mm aperture of the Tele-converted was indeed coupled into the Seestar's 30mm aperture, shown in the results. For those not familiar with detector statistics, I highlighted the important numbers to look at, namely Surface Brightness, Mean- and Median count.
So, I'm quite happy with these results, showing that I indeed managed to create a S50/60 Pro!
觀星論壇 
