There are long lenses available for Canon too, their dedicated videocameras are amazing, most of them using S35 sensors, i.e. Now I am a user of Sony gear, but that doesn't mean you cannot do that with other systems. Or cheaper with the A6400 or A6600 which is a crop sensor cam already, but also offers this clear image zoom afaik, there also giving you 2.25x. The 2.25x factor example with the Sony A1 very likely works with the new A7IV too, but I'd confirm that with the camera in hand if I were you, for the A1 I just tried it myself it works for sure. equivalence is 900m for the given 600mm lens. However this camera does not give you 4K in S35 crop mode, only 1080p. It has great low light capability because only 12Mpix on the sensor.
#CAMERA CROP FACTOR FULL#
That clear image zoom also exists when in full-frame mode, which can be interesting for you if you use a dedicated full frame video camera like the Sony FX3. Depending on where and what daytime you're going to film the birds, this can be prohibitive. You can continue this math with teleconverters, Sony has them with 1.4x and 2.0x factor, however the image get's a bit softer and you loose light. And Sony has clear-image zoom for video (when filming up to 50/60fps) allowing 1.5x Zoom with no quality loss in video now giving you 1350mm equivalence. You can film 4K in S35 crop mode with that camera giving you equivalent focal-length of 900mm. Let's assume you are using a Sony full frame e-mount camera, the A1, and a 600mm Lens. So you need to figure out which lenses are available for the camera system you intend to use. I think what you're trying to find is a camera that provides 4K video with the longest equivalent-focal-length or smallest equivalent-field-of-view to film birds far away.
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