Hi, comments interspersed:
--- Bob mailto:[EMAIL PROTECTED] Monday, March 04, 2002, 9:45:30 PM, you wrote: > On Monday, March 4, 2002, at 03:25 PM, Bob Walkden wrote: >> Although several people have claimed that I've misunderstood the >> purpose of the marked aperture (and I've refuted those claims in other >> replies), nobody has yet provided any justification for the programmed >> version or shown why it is superior to having the optimum aperture >> marked on the lens. > Why is it superior to simply having the optimum aperture marked on the > lens? Let me see... if you put the camera on automatic, and it picks > f16, and you know that f8 is much better for this lens, you would have > to switch from auto to manual or aperture priority and move to f8. > However, on aperture priority, you may fall into shutter speeds that are > not hand-holdable if you leave the camera on its optimal aperture. On the Z1-P, which as far as I know is the only camera that has MTF program, the switching is easily done in the Hyper Program mode. I'd suggest that it's quicker to do it this way than to change from say the H program to the MTF program. Changing means you have to hold down the button in the centre of the Mode button and rotate the Av dial until you find the program you want, which is a 2-hands operation. Since changing the aperture size in Hyper Program only requires you to turn the Av dial, and is a 1-hand operation, it follows that doing it that way is faster and easier than changing program modes. Similarly on a camera like the LX with a marked lens it's also a 1-hand job of turning the aperture ring. In the example you give (going from f16 to f8) if f8 is in the range where shutter speeds are too slow, then so is f16. If we take the reverse siutation where the program mode has chosen say f5.6 and you know that f8 is MTF-wise better, then yes, this possibility does arise, similarly in the case where going from f16 to f8 results in a shutter speed that's too high. But again, on the Z1-P it's a simple matter of turning the Av dial or more likely pressing the IF button. On something like the LX with a marked lens it's just a matter of turning the aperture ring in the correct direction. > If you are going to use the camera on auto, this function is entirely > worthwhile. Well, what I'm starting to think as I work my way through this, is that if your normal setting is the MTF programme (and you are therefore in Hyper Program mode), then there are advantages to this method. But the advantages are only there because of the Hyper Program mode which lets you control the shutter speed and diaphragm at no additional cost (apart from remembering to press IF when done), and only if you are normally in the MTF programme. Otherwise it seems to be too complicated to switch between the different programmes, H, d and M. > Please remember, we are arguing about an auto exposure program, here. > If your argument is that auto exposure itself is pointless, that's a > different battle altogether. That is not my argument. > -Aaron - 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 .
