43 Rumors was tipped to an unnamed website which leaked a new 45-150mm f/4-5.6mm HD OIS lens. The first reaction most of us will have to this news is Yay, another f/4-5.6 telephoto zoom. After all, Panasonic already has a 45-200mm f/4-5.6 zoom and followed that with a 45-175mm f/4-5.6 zoom. One of the first comments to the post on 43 Rumors gave me a chuckle: At least one of the reasons for the new lens appears to be size. I scaled the leaked image of the upcoming 45-150 to that of the existing Panasonic lenses and version 1 of the Olympus 40-150 zoom. I used v1 instead of the similarly sized R version of the Olympus zoom because I couldn't find an image with the R version seen from a comparable angle to the Panasonics pictured here. Visually, the new Panasonic lens is easily the most compact of the bunch. I'm guessing that the new 45-150mm lens replaces the existing 45-200mm lens and eventually hits a street price close to $200, while the PZ 45-175mm lens stays in the lineup as the slightly higher-end choice targeted at users for whom very smooth zooming during video is a priority. Next up for a diet? My guess is the Panasonic 14-140 (460g), a lens that feels more like the APS-C Sony NEX megazoom(524g) than it does like the Oly 14-150 (280g).