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Photo Forum / Film Photography / Other Equipment / December 2005

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Minolta Auto Meter IIIF

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info@portraitimpressions.com - 27 Dec 2005 04:51 GMT
Hello:

I realize I may have slightly overpaid ($100) on eBay for a Minolta
Auto Meter IIIF but it was in mint condition and I'm pretty excited
about using it. I have been testing it out and all the functions seem
to work like the manual describes.

Tonight I was testing out the flash measuring feature of the meter and
I came across something I don't quite understand. The meter has a
3-position switch for switching between ambient measurements, flash
measurements at 1/60 sec. and flash measurements at 1/250 sec. When I
fired my flash at the same distance from the meter when checking both
of the flash postions, the reading displayed the same suggested f-stop.
I believe I did everything correctly by waiting about a second after I
pressed the measurement button to fire the flash. Shouldn't this
suggested f-stop number change if the meter is set to 1/250 sec vs.
1/60 sec? I'm not too sure I'm clear on what the difference is in the
settings and the manual doesn't seem to go into that much detail.

Here is what I did:

- Set the meter to 1/60 flash measurement.
- Pressed the measurement button (side button) until the "F" appeared.
- Waited an additional couple of seconds.
- Fired the flash at a fixed output (1/64 power) and fixed distance and
noted the f-stop displayed.
- Set the meter to 1/250 flash measurement.
- Pressed the measurement button (side button) until the "F" appeared.
- Waited an additional couple of seconds.
- Fired the flash at same fixed output (1/64 power) and same distance
and noted the f-stop displayed.

In both cases, the suggested f-stop was the almost identical. Is this
correct and if so, am I missing something here?

Thanks in advance.

taco
Malcolm Stewart - 27 Dec 2005 11:42 GMT
> Hello:
>
[quoted text clipped - 34 lines]
>
> taco

What's the duration of your electronic flash ?  Is it contained completely
within the 1/250s?
Small flashguns tend to have short durations - studio flash tend to be
longer.

Signature

M Stewart
Milton Keynes, UK
http://www.megalith.freeserve.co.uk/oddimage.htm

Ken Hart - 27 Dec 2005 17:12 GMT
> Hello:
>
[quoted text clipped - 34 lines]
>
> taco

In both cases (1/60 & 1/250), the light measured was essentially the flash.
If the ambient light level were higher, you may have gotten a different
reading. Or if you had been using flash bulbs which burn for a longer time
than electronic flash...

Generally, when using flash, the shutter speed doesn't matter, so long as
the camera is able to sync at the selected shutter speed. OTOH, when using
fill-flash, the shutter speed and the aperture have to work together to get
the proper exposure. For example, assume your subject is in shade. To get
the proper exposure on the face and the bright scene outside the shaded
area, you use fill-in flash. The light from the flash is controlled by the
f-stop while the light from the bright surrounding area is controlled by the
shutter speed. Example #2: Your subject is on a balcony overlooking the
city. You set the f-stop so that the flash gives the proper exposure on the
subject, and set the shutter to speed several seconds to provide exposure of
the city lights.

Signature

Ken Hart
kwhart@aec.nu

Wolfgang Weisselberg - 27 Dec 2005 18:37 GMT
> Tonight I was testing out the flash measuring feature of the meter and
> I came across something I don't quite understand. The meter has a
> 3-position switch for switching between ambient measurements, flash
> measurements at 1/60 sec. and flash measurements at 1/250 sec. When I
> fired my flash at the same distance from the meter when checking both
> of the flash postions, the reading displayed the same suggested f-stop.

And why not?  Unless your flashes are large studio flashes,
they'll flash their flash in less than 1/250s.

> Shouldn't this suggested f-stop number change if the meter is set to
> 1/250 sec vs.  1/60 sec?

Only if you have SLOW flashes, no.

> I'm not too sure I'm clear on what the difference is in the
> settings and the manual doesn't seem to go into that much detail.

> - Fired the flash at a fixed output (1/64 power) and fixed distance and
> noted the f-stop displayed.

At 1/64 power, for the flash to make any different reading,
1/64 has to be longer than 1/250s, which means:
1/32    longer than 1/125s
1/16    longer than 1/ 60s
1/ 8    longer than 1/ 30s
1/ 4    longer than 1/ 15s
1/ 2    longer than 1/  8s
1/ 1    longer than 1/  4s

Your flash simply is *not* that slow, that's all.

-Wolfgang
wilt - 28 Dec 2005 00:53 GMT
The choice of 1/60 or 1/250 setting on the meter would simply reflect
the shutter speed set on the camera itself, and have nothing to do with
your flash unit being measured.  So if you were shooting in a setting
where ambient light is bright, the choice of 1/60 or 1/250 would matter
only because the lens was letting light strike the film/sensor from the
ambient lighting.  As other posts have noted, most electronic flashes
output ALL of their light in no more than 1/400, shorter than the 1/250
setting!  That is why measuring flash at the two settings seems to make
no difference.  Try your test again out in the daylight, and you will
certainly see a change between settings, but ONLY because of the
intensity of the ambient light, not the intensity of your electronic
flash source!
 
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