The Leo Triplet

This is a group of galaxies in Leo, the Lion constellation that dominates spring nights. M65, M66 and NGC3628. At distances of 35, 42 and 37 Million light years, they form a fysical group in space  Tidal forces rip apart the extremities of NGC3628. The smallest galaxy identified in this image is PGC1423398 at a distance of 2 Billion light years: so glad those fotons travelled that distance in space & time only to get caught in my camera!! 

Picture with: C11 Starizona LF SCT reducer F 7.2 FL2010mm Nikon D750 FF Optolong L-Pro 2″ 800iso 27x600s

SQM readings from 20.25 to 20.60 Meldert April 20, 21 2018

The Horsehead Nebula in orion

This is a very familiar sight and thousands of pictures have been taken of this little “seahorse”  or horsehead in the sky.  Taken with the Celestron C11 on an EQ8 mount, Starizona LF corrector for Schmidt-Cassegrains, a Nikon D750 DSLR modified for extra H-Alfa sensitivity. 22 frames of 300 seconds each are combined in this image

Tri-Bahtinov Mask

In addition to focussing, the tri-Bahtinov also indicates collimation status along three axis.  You could basically do the same by turning your classic Bahtinov at 120° angles and check focus each time.