On Thu, Jan 15, 2009 at 10:46 AM, Godfrey DiGiorgi <[email protected]> wrote: > > On Jan 15, 2009, at 7:02 AM, David J Brooks wrote: > >> Just so i understand, which you know means at least 3 more >> questions.:-), you use the Panasonic adaptor on the G1, then add a >> Nikon, or Pentax, or what ever lens you want to use, adaptor onto the >> Panasonic adaptor. I think that's what you are saying. >> In essence, two adaptors and the lens. > > Yes, that's what I'm doing. > >> Have you noticed any focus problems, or exposure problems, things i >> still have issues with, with Pentax gear. > > Adapted lenses are manual focus only and manual iris** operation*. The G1's > EVF makes critical focus a cinch as it is large, bright and supports > magnification assist for critical focus (very useful with short focal > lengths). Since and focus are driven by light hitting the imager sensor > 100%, both are spot on accurate. The EVF/LCD supports an in-viewfinder live > histogram too. > > * Except for FourThirds system SLR lenses. All of those support full iris > automation and about nine out of the 22 or so available FourThirds SLR > lenses will autofocus, the others all support manual focus with > auto-magnification assist. > > ** Because of this, adapted manual lenses must have mechanical, manual iris > and focus mounts. Unfortunately, Pentax DA series lenses lack the manual > iris control needed. A special adapter with an iris control lever could > solve that problem. However, servo-controlled focus/iris lenses cannot work > ... no way to get power to the focusing servos. > > Godfrey
I suspect some enterprising fellow could come up with EF, N, SA and possibly Nikon E-type adaptors with full iris control by building an exlectronic adaptor. Sort of a cross between conurus's Contax N to EOS conversion and the 4/3rds->m43 adaptor Panasonic already sells. m43 does use servo controlled focus and aperture so there's obviously a source of power. It's probably more trouble than it's worth, especially since a G1 with say an 85L on the front would handle pretty badly. Oh, I picked up a red G1 myself. Liking it so far, but still figuring out my workflow. Bridge CS3 seems to be allergic to the DNG's right now. -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
