John Francis wrote:
But you're still basing your agument on the (apparently unwarranted) premise that the *ist-DS *does* disable TTL flash for all non-AF lenses. According to other posters here, that simply isn't the case.
As I said, people are far too fast to accuse Pentax of deliberately disabling bodies for the sole purpose of selling new lenses.
Peter J. Alling mused:
John you're right and you're wrong. If the lens tells the body the focus distance, that would be usefully for
helping calculate the flash duration, disabling TTL flash with lenses that don't support sending distance
information to the body has two purposes, and one is the sale of new lenses, the other is the assumption
that the user is incapable of a rational decision. The better solution would be to make the user aware of how
the body calculates TTL flash exposure and allow the user to make a choice, not force one on him.
John Francis wrote:
--Jens Bladt mused:
Kostas wrote:
I believe it was
mentioned previously that on the -Ds it does not do TTL if you don't
have an AF lens. This is a limitation induced with extortion in mind,
Why are people so fast to make unfounded accusations like this?
Is this really true! What would AF have to do with flash duration?
Distance, distance, distance.
The digital contact (introduced on the AF lenses) doesn't just tell the camera body the lens identification code and current aperture (and focal length, for zooms); it apparently also reports the focus distance. While there is no official confimation from Pentax, it is believed that the metering logic makes some use of this information. (Nikon, of course, made a big feature of their 3D Matrix Metering, introduced at about the same time. Pentax don't even mention it).
I can understand why mankind hasn't given up war. During a war you get to drive tanks through the sides of buildings and shoot foreigners - two things that are usually frowned on during peacetime.
--P.J. O'Rourke
--
I can understand why mankind hasn't given up war. During a war you get to drive tanks through the sides of buildings and shoot foreigners - two things that are usually frowned on during peacetime.
--P.J. O'Rourke
