Testing the "PROGRAM" mode !

[JPS]

Folowing my underexposure problem (see http://fmount.com/forums/showthread.php?t=11471 ), i did a test on the "P" mode ! Normally, in this mode you can change the shutter-speed and the programm will set the aperture accordingly ! So, if you shoot one pic at 1:45 @ f/9.5, then take more pics, crancking up the shutter speed, you shoud obtain several pic EQUALLY lightened, but with different aperture settings !

Well, it showed that it doesn't work as well as it shoud :( ... i don't know wheater is't the camera's fault or the lens fault :confused: !
NB. I know that there is a TREMENDOUS difference in lighting between the pic at 1:90 and the one at 1:125, but i double-checked my settings and i DIDN'T DO anything wrong, nor did i forget anything :dunce: !
Now, maybe i shoud make the same test, using OTHER lenses, just to check that it's not the Tamron 28-75 that has a defect...

Could you try it on your side and give us the results ? ...might be interesting !
:cheers:

[JPS]

As i said i was going to do, i ran the same test, this time with the Nikkor AF 50 mm f/1.8 D ! I used the same technique as for the first test: set the S2 in "P" mode, distance in manual, and started shooting with 1:45 @ f/9.5 (as given by the program), then crancked up the shutter speed, one step at a time, taking 8 pics, up to 1:500 @ f:2.8.

Now, look at the result :eek: !!!

What do you think ?

[robinp]

If the camera is shooting at the correct speed and aperture when you set them manually (and your lovely lake shot at http://theswampbbs.com/forums/showthread.php?t=11436
bears this out) then it seems that the camera's exposure meter is poorly - time to talk to Fuji?
If you set speed and aperture manually, that's what you get. But when (on auto) the camera indicates certain speed & aperture values its only an indication - during exposure the camera will measure the light again and maybe come up with different values. That's my theory anyway..... Do the Exif values agree with what the camera told you when you set up these shots??

Cheers, Robin

[JPS]

...............Do the Exif values agree with what the camera told you when you set up these shots??
Hi robin ! Yes the EXIFS are giving exactly the same numbers as the one that are set on the top LCD screen ! That's what worries me :eek: !!!
I'm also terrified of what Fuji might ask me "just to check", having allready heard of their usual pricing for any repair: problem is that i guess Nikon and Canon "after-sale service" must certainly be as expensive :throwup: !
:cheers:

[big_ben_blue]

JP, here's an idea: take your camera and lens to a camera dealer in your city, and protend to shop around for some new gear. So check your lens with a new SLR, check your camera with a new lens. This should give you an idea where the fault may lie.

I have a lens where the aperture ring on the mount is a bit sticky sometimes, but this usually exhibits itself with overexposed shots, rather than underexposure.

Cheers,
Chris

[robinp]

Yes the EXIFS are giving exactly the same numbers as the one that are set on the top LCD screen !
:cheers:
Then its a faulty shutter??

Cheers, Robin

[vmic92]

JP
Have you tested to use the same values but with the "S" mode (speed priority), and with the "A" mode (aperture priority) ... and with the "M" manual mode ?
What happens then ?

[Tom V]

Maybe the same brain at Fuji that designed the TTL Flash metering system worked on the Program metering system. :eek:

[vmic92]

Is not a problem of calculation, the values seems to be goods : 2 times more speed for 2 times less aperture, for me this is correct (perhapse my english is not correct). But we don't know if the shutter and the diaph executes correctly the calculated values ????