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      Gear Reviews — youtube

      Nikon 20mm 1.8s Vs Nikon 20mm 1.8G For Astrophotography

      Nikon 20mm 1.8s Vs Nikon 20mm 1.8G For Astrophotography

      Ever since the news of the Nikon mirrorless system was announced it was fair to say I was a little excited, then I had seen the changes to the lens mount and knew at an instant that this could finally produce the quality of stars across the frame of an image I was used to seeing from shooting with telescopes optimised for star quality corner to corner.

      It had taken a little while for the wide angle lenses to be released but when they did I jumped on them. The Nikon 20mm 1.8s lens is a stunning lens, much larger compared to the older Nikon 20mm 1.8G lens and the new 20mm 1.8s lens feels a lot more solid and better built.


      But let's bypass all the basic info about the lenses and get straight to business. When it comes to nightscape photography and analysing my own photos I can be a bit fussy. For me it comes down to three factors.....

      1. Can I shoot with the lens wide open
      2. Does the lens produce chromatic abberation wide open
      3. What are the stars like corner to corner

      Usually with lenses of the past I've been shooting around F/2.8 aperture due to the performance of these lenses...... but not anymore!

      So lets compare images... 

       As you can see in the above comparison the stars are sharper and more pinpoint across the whole frame, but lets have a closer look at the corners.

      Overall I believe the Nikon 20mm 1.8s lens is far superior over the 20mm 1.8g lens and the choice I personally made to switch over to the Nikon Z system for astrophotography was the perfect one to make.

      Celestron Electronic Focus Motor

      Celestron Electronic Focus Motor

      The Celelstron electronic focus motor has changed the way I achieve focus on my Celestron RASA 8.

      When you manually focus on in instrument like a RASA 8 it can be rather challenging, the faster the optics F/2 the more precise your focus needs to be. You can get very good focus by using the telescopes focus knob and doing it manually however I noticed a big difference since using the electronic focus motor.

      Not having to wait for the telescope to settle, then look at your focus, then adjust and wait for it to settle again. With the electronic focuser you don't have to wait for the telescope to settle because your not touching it and the fact you can make extremely fine adjustments to focus is exactly what I've been looking for, no need for me to purchase and install a feather touch focuser to the RASA 8 anymore.

       

      Telescope Compatibility

      The Celestron Electronic Focus Motor is compatible with the following Celestron telescopes....

      All 6" to 14" Celestron SCT and Edge HD telescopes produced since 2006 the focus motor will work with.

      RASA 8" and RASA 34 cm it is compatible with, the RASA 11" can be used however you need to by the Celestron adaptor kit for it.

      7" Maksutov-Cassegrain

      Celestron 5" or SCT's made before 2006 the focus motor will not work with.

       

      Installation and Thoughts

      


      Where to Purchase

      

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