George S.
How many is enough?
Don't take this the wrong way, but...you're crazy dude.I think if you were getting in M5 territory, then you can complain about bulkiness
I'm with him on this one!
T
tedwhite
Guest
OT: Hey, George. I work with two guys from "Joisey." Every time I ask them a question about why they're doing something, the inevitable answer is, "You got a problem with that?"
acanalda
Member
Like other cameras the metering limit depends on the lens speed; with an f/1.4 lens the lowest measurable luminance level in the subjet is 0.25 cd/m2. With an ISO 100 film that is equivalent to an exposure setting of 1 sec at f/1.4, or the slowest sutter speed setting anyway. With lenses of smaller maximun aperture the low metering limit becomes higher -0.5 cd/m2 with an f/2 lens or 1 cd/m2 with f/2.8. With the 50 mm Noctilux f/1 the limit is lower at 0.13 cd/m2.
As you know, the film speed setting in the camera back does not affect the metering limit, only the available exposure combinations. Thus with ISO 25 film, 1 sec at f/1.4 is the correct exposure for a subjet luminance value of 1 cd/m2 - still above the metering threshold. But if you turn the shutter dial beyond 1 sec to B, the leds go out - apart from the time exposures there is no way of setting a longer exposure than 1 sec. However, with a high-speed film of say ISO 800, 0.25 cd/m2 needs an exposure of only 1/8 sec at f/1.4. If a subjet then needs 1/4 sec, the led again goes out.
There is also an upper metering limit determined by the smallest lens stop. With a 50 mm lens -which can stop down to f/16- this corresponds to about 33000 cd/m2. With a still brighter subjet the right led would stay alight, but there is no way for the left led to light as well, since there is no smaller aperture nor faster shutter speed. If the lens is capable of stopping down to say f/32 (e.g. the 135 mm ELMARIT f/2.8), the upper metering limit is -in theory- some 125000 cd/m2. But if the camera is not actually pointing at the sun, you rarely have to worry about upper metering limits: the average luminance of the brightest outdoor scene in brilliant summer sujnlight rarely exceeds 8000 cd/m2
Hope this brief explanation helps....
Regards,
Arturo
As you know, the film speed setting in the camera back does not affect the metering limit, only the available exposure combinations. Thus with ISO 25 film, 1 sec at f/1.4 is the correct exposure for a subjet luminance value of 1 cd/m2 - still above the metering threshold. But if you turn the shutter dial beyond 1 sec to B, the leds go out - apart from the time exposures there is no way of setting a longer exposure than 1 sec. However, with a high-speed film of say ISO 800, 0.25 cd/m2 needs an exposure of only 1/8 sec at f/1.4. If a subjet then needs 1/4 sec, the led again goes out.
There is also an upper metering limit determined by the smallest lens stop. With a 50 mm lens -which can stop down to f/16- this corresponds to about 33000 cd/m2. With a still brighter subjet the right led would stay alight, but there is no way for the left led to light as well, since there is no smaller aperture nor faster shutter speed. If the lens is capable of stopping down to say f/32 (e.g. the 135 mm ELMARIT f/2.8), the upper metering limit is -in theory- some 125000 cd/m2. But if the camera is not actually pointing at the sun, you rarely have to worry about upper metering limits: the average luminance of the brightest outdoor scene in brilliant summer sujnlight rarely exceeds 8000 cd/m2
Hope this brief explanation helps....
Regards,
Arturo