New images with the 76EDPH

A clear evening, just before the Moon appeared, allowed me to take some more images with the new TS76EDPH. What was really evident was how fast this scope is capturing the photons. A single frame on ISO800 with a Nikon D750, 300 seconds exposure, taken at about 50° above the horizon, would have a DSLR histogram peak about halfway.

Orion Widefield, Nikon D750, TS76EDPH, cropped 10% downsized to 66% about an hour of data in 180″ and 30″ frames. SQM 20, Optolong L-Pro filter in T-ring. MGEN tracking Manual Focus. SQM 20

The file above is an original Nikon D750 FF NEF that was converted to JPG by ViewNX, using a ‘good balance’ quality conversion. The “highest quality” file was too large to upload on the website.

It was lightly stretched. The quality of the file allows to check the star shapes. It is no match for the original NEF quality out-of-camera.

This is the “official” provessed version 🙂 like in Astrobin.

Finalized version 20×180″ ISO800 SQM20 Optolong L -Pro Nikon D750 TS76EDPH

Testing the TecnoSky AG70

On loan from a friend, I could spend some clear nights with this short-focus flat-field refractor. It has 70mm aperture and 350mm focal lenght, for an F/Ratio of F/4,9. It delivers a nice illuminated field and pinpoint stars almost to the corners of the frame. Some slight blue fringing is present near the corners. Focusing is very critical, and also very temperature-dependent. An autofocuser is almost indispensable to keep control over the focus.

Aldebaran non-cropped FF field without any filters (only stacked and stretched)
Aldebaran in B/W non-cropped fullframe with the Oprolong L-Pro (some fog or high clouds) only stacked and stretched
Cone & Christmas Tree nebulae, in B/W with the Nikon D750 (stitch line visible )
NGC2244 or Rosette Nebula mosaic 3+3 hrs Nikon D750 & TecnoSky 70AG