RASA 8: Test Report with mit Fujifilm X-T3 - Sebastian Voltmer

The RASA 8 already proved itself as practical and easy to operate in the first tests. Without annoying mirror shifting I could focus the camera (Fujifilm X-T3) within one minute. Thanks to the very fast f-ratio of the RASA 8, it is even possible to focus on average bright stars in the field of view, without having to point the telescope at a bright star.

No collimation was necessary after unpacking and mounting the instrument (the telescope seems to be very resistant against shocks and temperature changes). The star image in APS-C format is perfect down to the corners of the image. Due to the high light intensity, very short exposure times of less than 30 seconds and low ISO values can be used, as in the image shown below. This accelerates the image acquisition and increases both quality and comfort, since you don't need the perfect aligning of the mount to the celestial pole and don't have to bother with tracking errors and a parallel mounted guiding scope.

The RASA 8 is one of the few instruments that I know that are a very good choice for the ambitious astrophotographer as well as for the beginner. A top price-performance ratio for an extremely fast instrument which shows very fine stars, the RASA 8 is unrivalled. The RASA 8 is one of the best instruments I can imagine to capture large, dim gas nebulae in great detail on the chip.

The Cirrus-Nebula in Cygnus. The area fits completely onto an APS-C-sensor when used with the RASA 8. The exposure time is ca. 70 minutes (141 x 30 s) with a Fujifilm X-T3 (ISO 800) and a Celestron RASA 8. The image was taken at Spicherer Höhe close to Saarbrücken in Germany.

The Cirrus-Nebula in Cygnus. The area fits completely onto an APS-C-sensor when used with the RASA 8. The exposure time is ca. 70 minutes (141 x 30 s) with a Fujifilm X-T3 (ISO 800) and a Celestron RASA 8. The image was taken at Spicherer Höhe close to Saarbrücken in Germany.

 

We are happy about the positive feedback we received.

For this test, Sebastian Voltmer got a Fuji X-T3 by our Celestron dealer Fotohaus Wiesenhavern. We would like to thank him very much for this.

2 thoughts on “RASA 8: Test Report with mit Fujifilm X-T3 - Sebastian Voltmer”

  • Paul

    Hi there,

    Very informative article, especially for me as I really like using Fuji XT cameras. Im just wondering if attaching the Fuji to the front of the RASA needed any extra hardware or spacers? Also, what mount did you use? Cheers,

    Reply
    • Team Baader Planetarium
      Team Baader Planetarium December 5, 2019 at 10:58 am

      For the Fuji, you need the Baader Wide-T-Ring Fujifilm X with D52i to T-2 and S52 # 2408331. The adapter from the RASA to the T-2-thread is already included with the RASA. You also need to leave the clear glass filter which is mounted in the RASA at its place (or install another filter) to get to the right distance; the thickness of the filter is part of the optical design.

      We do not not know which mount was used for this image, probably a 10Micron GM2000 HPS - but the good thing about the RASA are the short exposure times, so that tracking errors are not much of an issue.

      Reply
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