Just for fun

Purchased this jewel as new just for fun. 150mm f/2.8 is quite suitable for certain wide field objects. Will try it with D7100 body and CCD-cameras.

Binning 2x2

When binning 2x2 you get your data four times faster. In other words for example a single 2x2 binned 5 minutes exposure equals unbinned 20 minutes exposure. Here is an example taken with SX-814 CCD-camera (only 30 five minutes 2x2 binned exposures were taken using 3nm ultra narrowband H-alfa, O-III and S-II filters):