I have created some videos showing the crop factor on the Ursa 4.6k EF mount. Surprisingly with Barrel distortion correction, there is no need to crop. But if you dont want to fix barrel distortion it is only a 1.05x crop.

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See links here:

https://drive.google.com/file/d/1kG_w5krUiWT85oh15Wpoq-xWf0P3Xgyg/view?usp=sharing

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https://drive.google.com/file/d/13hddCJNEIV7SF7eBqtLBOamJXzu9EeMS/view?usp=sharing

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This rehoused Lens combination is very rare, with a 10X zoom potential at T3.2 Works well with EF or PL 1.2x or 1.4x extenders allowing for use on all larger S35 sensors. A 1.4x EF extender will place in the usable range of FF sensors if you perform barrel distortion correction in post.

Will vinette slightly on most S35 sensors, but sensors such as S35 Pocket 6K work flawlessly.

Lens comes in EF or PL + a custom hard case + Shims. Also includes very large front UV filter to protect front glass.

Regretable sale, as I had some big plans for this lens, but have had some personal stuff come up and I need to let it go. Never actually used. Just had on camera to test.

This is a fairly large lens, however considering its parfocal design and 25-250 zoom range, its actually very small.

Selling for the price is cost me to acquire and rehouse.