Indie videographers using the Panasonic GH-2 demand constant aperture zoom lenses and until now, one of their favorite lenses is the very big, heavy, expensive Olympus Four Thirds 35-100mm f/2.0 pro lens.

Panasonic have just announced 2 concept lenses for Micro Four Thirds which should delight these guys no end.

Both have the HD and X nomenclatures indicating that they are designed for HD video and that they are high quality.

The two are:

• 12-35mm f/2.8 giving 24-70mm constant aperture in 35mm terms
• 35-100mm f/2.8 giving 70-200mm constant aperture in 35mm terms

Given that the specs may change before production, many are hoping Panasonic can tweak a little more aperture (say f/2.5) just as they were able to do with their 14mm pancake which was initially slated to be f/2.8.

Although constant f/2.0 would be great, the practicalities are that such an aperture would make the lenses far too big and expensive for most Micro Four Thirds users and thus the above lenses which appear to only have a 58mm filter thread would make lovely compact high end zoom lenses.