BUMP. Just figured I'd revive this. Does anyone have any new reports on using alternate lenses on the HD100? (Not so much the 13x option, but 1/2" lenses or others?)

I've been trying to dig up info on other options myself. There is one I was wondering about, a lens for the GY-X3 and Panasonic AJ-D215 cameras: T14X5.5BRM. It's one of the few native 1/3" lenses I could find. Certainly an older model, but someone out there might have one they could try. The big questions are: does the quality hold up for HD, and is the 1/3" mount the same as the HD100?

I find it hard to believe normal 2/3" lenses resolve 80-100 lp/mm when Zeiss Digiprimes resolve only 56 lp/mm. I’m sure the Digiprimes will be sharper and better than any 2/3” lenses out there.
Based on this fact, I also find the found 133 lp/mm for the HD100 a weird number. If the 2/3” 1920x1080 Cinealta get the best results with a 56 lp/mm lens, I don’t think the 1280x720 HD100, even if 1/3”, needs almost 3 times more resolution at 133 lp/mm.
Just speculating, but something tells me the numbers in this thread are somewhat off.

The numbers are not off but its the way you use them.
Testing a lens for MTF performance usually involves projecting an image through the lens from a graticle, onto a screen and the MTF is then measured by a sensor.
A figure of 80%-99% (the measured difference between the black and white portion of a line pair)
would be thought of as reasonable measured at the centre.
When people say that the Zeiss resolves only 56 lp/mm this is not strictly true. In actual fact the Zeiss can probably resolve around 200 lp/mm.
The figure of 56 lp/mm only refers to the standard by which HD lenses are measured and , hence the graticle that is used during MTF testing.

Incidentally, the standard for 35mm motion picture lens testing is only 20 lp/mm, However when I was at Optex we used a 40 lp/mm standard.

I hope this makes things a bit clearer.