Hello,
I am new here and new to Pentax. I am not however new to photography. I have a question regarding exposure time while using manual lenses.
Shooting in the aperture priority mode with F11 and several stops of ND in front of the lens. I am shooting a long term timelapse of a construction project. I want an exposure time of about half a second in full sun in order to have good motion blur.
I would expect the camera to expose at half a second in full sun during the day, and up to a maximum of 30" at night.
When I attach an M42 mount lens via the official Pentax adaptor (either a zeiss or a pentax super takumer) in the AV mode or the P mode the maximum exposure time that the camera will allow is 1.5" and not the 30" that I would expect.
I have gone into the custom menu and enabled the 'make s lens available' and 'aperture ring permitted'
As soon as I switch to the 'kit zoom' the camera happily exposes to 30".
If I put those M42 lenses on any of my canon bodies the camera happily exposes to 30"
I am a professional cameraman with many years working with motion picture, film, digital etc.... but this one has me baffled. I feel like there has to be a way to achieve this exposure.
Using these older manual lenses is the best option for me as they will give me the best results. I would prefer not to use a zoom. (I cannot afford to have the lens move). The timelapse installation will be in place for 18 months. The camera is well housed, with a good battery system and timelapse controller.
Looking forward to any thoughts from the forum.
Thanks in advance,
Ben Ruffell
Cameraman
Ben Ruffell