Focus points for 183M on William Optics scope

As found tonight, using William Optics acrylic Bahtinov mask.

Note the t2-extension tubes required to make the Tele Vue 14mm Radian eyepiece in the finder port of the TS-Optics OAG/flip mirror par-focal with the camera. This number of extension tubes means the eyepiece has to be pulled out slightly but when I tried next size up on one of extension tubes then eyepiece could not obtain par-focality.

Photos from penumbral lunar eclipse 10/1/2020, Lichfield, UK

A penumbral lunar eclipse occurs when the Sun, Earth, and the Moon are imperfectly aligned. When this happens, the Earth blocks some of the Sun’s light from directly reaching the Moon’s surface and covers all or part of the Moon with the outer part of its shadow, also known as the penumbra.

Last night, such an eclipse was visible from the UK.

Below are 2 photos taken at around maximum eclipse @ 19:10 and 19:25 on 10/1/2020.

Sony A58 DSLR camera with 300mm lens, single frames.




How to make an image intensified eyepieces using old tank image intensified tubes – re-post from 2009

In 2009, Damian and I successfully managed to make image intensified eyepieces out of old tank image intensified tubes. Below are links to PDF files for the instructions on how to make those eyepieces.


Instructions for making the eyepieces:

Instructions-making-image-intensified-eyepiece-2009 (PDF)

Image-Intensifier-Info-Instructions-Nov-2009 (PDF)

Photos of the eyepiece and its construction, and an excuse to re-print a photograph of myself looking a lot younger (with hair!):

Examples of images taken through these eyepieces auing hand held smartphone in 2017:

The following three photographs are Double Cluster in Perseus/M81 and M82 in Ursa Major/M42 Orion Nebula.

Full details of the observing session, equipment used and objects in photographs above can be seen below:

Processed image of M37 in Auriga 4/1/2020, processed on 8/1/2020

Results of processing this data today.

Processed image of M37 in Auriga – data from 4/1/2020, stacked, DDP in Nebulosity 4, curves in GIMP, on 8/1/2020.

Messier 37 (NGC 2099) is the richest open cluster in the constellation Auriga – M37 is located in the antipodal direction, opposite from the Galactic Centre as seen from Earth. Estimates of its age range from 347 million to 550 million years.

  • Sky Watcher Equinox Pro 80mm OTA
  • Sky Watcher EQ6 mount.
  • Altair Astro 183M mono camera.
  • 5 second sub-frames.
  • Processed with flats and darks.
  • Lichfield, Staffordshire, UK

Astrometry by