Mat Maessen said: > Since a flashbulb takes a little bit of time to actually fire up to full > brightness, the camera fires it off before the front shutter curtain is > fully open. If you find an instruction manual for the camera, you'll > probably also find that the flash sync speeds in the FP position are > slower than for the X position, since a flashbulb burns for longer than > an electronic flash fires.
Ah, that might explain the problem I had with flash bulbs in a Tilt-A-Mite that I was using on my K1000. It was nothing important, I was just trying to find a guide number for those bulbs and outdoor use. But... I think it was about the right half of the pictures were underexposed. I'm sure I used 1/30 second, and the electronic flash pictures I took to calibrate an electronic flash turned out fine. I took notes, they're at home. I haven't used the flash bulbs since, I was waiting for warm weather before I went outside and tried again to figure them out and calibrate them.
