INDI Library v1.9.8 Released (29 Sep 2022)

Bi-monthly INDI Library released with new drivers and bug fixes.

APS-C and fullframe lenses

  • Posts: 5
  • Thank you received: 1
Hi friends! 

I was wondering if I need to factor in the crop factor in the focal length when using an APS-C camera...

ie. using a Canon 6D with a 200mm fullframe lens vs. a Canon 80D (crop factor 1,6) with the same 200mm fullframe lens. So does Ekos / Astroberry automatically know from the different sensorsizes that it needs to recalculate the FOV or do I need to create a separate lens with 320mm if i am using a fullframe lens on a APS-C camera? and if I have to create a second lens does the f stop change as well since the lens is the same I would not think so...

Thank you! clear nights pgartl
Scope: 200/1000 Newton
Lenes: 400mm f/5.6, 200mm f/2.8, 50mm f/1.8, 24mm f/1.4, 8mm f/3.5, 2x Extender
Cameras: 183MC Pro, 120MM mini, Omegon 1200b M, Canon 6D & 77Da
Mounts: EQ6R-Pro, NEQ5 Goto, Star-Adventurer
Software: 2x Astroberry PI 4, SirilL, gimp
The following user(s) said Thank You: Jasem Mutlaq
1 year 3 months ago #75043

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  • Posts: 1942
  • Thank you received: 418
The focal length of a lens or telescope is independent of the size of the sensor of the camera used. So 200 mm remains 200 mm regardless of if you use a 1 x 1 mm sensor or a 100 x 100 mm sensor. Ekos can indeed compute the new FOV but you need to clear the DSLR info in the imaging tab before you start imaging. There is a trashcan icon that you need to click and then Ekos will ask you for the new info.
Wouter van Reeven

ASI6200MM and 7 slot 2" filter wheel with a SkyWatcher Esprit 80 ED on a SkyWatcher HEQ5-Pro
ASI1600MM-Pro Cooled and 5 slot 1.25" filter wheel with an 8" TS Ritchey-Chrétien on a SkyWatcher EQ6-R
1 year 3 months ago #75045

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