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  1. H

    115 objective focal length and f-number

    Hi etudiant, I didn't measure anything. I just passed along information from others. We know Swarovski's magnification specs are the same for both the 95mm and the 115mm modules when they are combined with the eyepiece/prism module. That should indicate that they have the same focal length...
  2. H

    115 objective focal length and f-number

    Coincidentally I just ran into this interferometry report for a 95mm objective module on Cloudynights. Focal ratio is f/5.8, therefore focal length is 551mm. https://www.cloudynights.com/topic/729314-swarovski-atx-95-optical-test/
  3. H

    115 objective focal length and f-number

    Here's a short thread on the subject of the ATX/STX focal lengths. https://www.birdforum.net/threads/atx-scopes-objective-focal-lengths.269099/ The 115mm focal length would be the same as the 95mm. Its focal ratio would be around f/4.8 There are a couple of ways to measure the clear aperture...
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