> A normal SLR's TTL metering won't be any good for pinhole photography since > there's no aperture size feedback to the camera's exposure circuit. A > normal lens' aperture ring operates the camera's diaphragm resistor to tell > the meter what aperture you've selected. With pinhole photography, there > will be no such connection. Metering will be via hand held meter or Sunny > 16 (Moony 11) and aperture will be calculated.
Actually not true. On M and K series lenses, the lens tells the body how many stops down from wide open the aperture is set using the mechanical aperture coupler. These lenses do not communicate the absolute aperture. If there is not such coupler on the lens, the body just reads it as wide open (which is the correct exposure, because there is no auto aperture on a pinhole). After all, most Pentax bodies still work with screwmount lenses (no aperture info) and mirror lenses (also no aperture info, because it is fixed). The more important issue is whether the TTL meter is sensitive enough to give an accurate exposure with so little light. -Scott - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
