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Chronos User Discussion / Effective focal lengths/f-stops for lenses with various Chronos mounts
« on: June 06, 2023, 10:28:03 PM »
Is there a nice shorthand way to calculate effective focal length and f-stop for lenses mounted on the Chronos using adapters?
For instance, I know that using the EF-to-C mount adapter increases the lenses' effective focal length (making it less wide) and raises the effective f-stop (making it slower). Presumably, so does the new MFT mount due to increasing the distance from the sensor to the lens. Even more so if using an EF-to-MFT adapter stacked onto the MFT mount.
I was hoping there would be simple conversion factors/ formulas you could use to predict how any given lens will end up when using various adapters on the Chronos.
For example using a 9mm F2.8 EF-mount fisheye with an EF-to-MFT adapter on the MFT mount might end up as a factor of 2, resulting in an effective 18mm F5.6 lens. I was hoping there would be a nice easy multiplier you could use like that.
For instance, I know that using the EF-to-C mount adapter increases the lenses' effective focal length (making it less wide) and raises the effective f-stop (making it slower). Presumably, so does the new MFT mount due to increasing the distance from the sensor to the lens. Even more so if using an EF-to-MFT adapter stacked onto the MFT mount.
I was hoping there would be simple conversion factors/ formulas you could use to predict how any given lens will end up when using various adapters on the Chronos.
For example using a 9mm F2.8 EF-mount fisheye with an EF-to-MFT adapter on the MFT mount might end up as a factor of 2, resulting in an effective 18mm F5.6 lens. I was hoping there would be a nice easy multiplier you could use like that.