HD ROMs are cooked using the Touch Pro 2 or Diamond 2 camera files, that provide far better picture quality, and faster picture trigger.
However, these two devices feature a hardware zoombar, so the touchscreen zooming options have been removed.
You can still install a CAB to restore the original camera files, but it's not a good idea if you want to take good pictures.
It's not a real zoom anyway. It just enlarges the central picture taken from the CCD chip and its fixed focus lens, so it doesn't actually zoom at all : you'll achieve exactly the same result if you manually crop your picture and enlarge it... Yes, it will become blurry. Yes, that's exactly what a software "zoom" does.
So don't regret it.
HTC HD/HD2 with 64 GB SD XC - Energy WM6.5.3 build 29022 French / Sense 2.5 build 2019 / CHT 2.0 - GTX clock - Radio ROM 1.17.25.09/2.12.50.02_2
How-to : FingerKeyboard management and XT9 patch
Wiki : Energy ROMs Wiki
Energy ROMs add-ons & fixes CABs : General mods and fixes
*** HD FRA fixes
*** HD2 FRA fixes
Non flipping digital clocks for Sense/CHT 1.7/1.8/2.0 : CHT2.0 version ready !