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Photo Forum / Film Photography / Medium format / December 2006

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Mamiya RZ and flash

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Steve - 15 Dec 2006 12:44 GMT
I'm going to shoot some macro medium format underwater using my RZ.
This may read a little odd.

In fact the subjects will be in an aquarium.  Lighting will be studio
flash.  Reading about the RZ and flash I'm slightly surprised there
has aparently never been any sort of in camera flash metering offered.
Which is clearly the only meaningful way to meter for studio flash in
this situation, you can't exactly dip a flashmeter into the scene
here.  I don't need on-the-fly auto TTL at all, just wondered if maybe
some third party company has ever made a flashmeter that worked on the
focussing screen, sounds technically possible.  Maybe not the
demand...  Anyway best solution I can come up with is using a digital
Nikon in manual mode to find the exposure first.  Which should work,
but kind of dilutes the purity of the MF experience.  Any other ideas
welcome.

Steve
Bandicoot - 15 Dec 2006 16:30 GMT
> I'm going to shoot some macro medium format underwater
> using my RZ.
[quoted text clipped - 13 lines]
> should work, but kind of dilutes the purity of the MF
> experience.  Any other ideas welcome.

Two thoughts:

The Minolta Booster II, which works with certain Minolta and Sekonic meters,
can be used to meter off the ground glass screen, and this allows you to
take a TTL flash reading from a camera without TTL flash metering.

Another idea is to use a flash meter that works in reflected as well as
incident mode, possibly metering off a plastic grey card dipped in the
aquarium.  My Sekonic L608 can be used as a reflective spot-meter for flash
as well as in incident mode, for example.

Peter
Steve - 15 Dec 2006 18:03 GMT
>Two thoughts:
>
[quoted text clipped - 6 lines]
>aquarium.  My Sekonic L608 can be used as a reflective spot-meter for flash
>as well as in incident mode, for example.

That's two really useful pointers thanks, I'll explore those options.
I didn't know that reflective flash metering was available, sounds
interesting,

Steve
Tony  Polson - 15 Dec 2006 18:20 GMT
>I didn't know that reflective flash metering was available, sounds
>interesting,

The two largest manufacturers of light meters both offer it - Sekonic
and Gossen.
Steve - 15 Dec 2006 23:21 GMT
>The two largest manufacturers of light meters both offer it - Sekonic
>and Gossen.

Interesting.   I'm currently wondering how well this works in modest
macro situations, subject distance maybe a foot or a bit less.
Comments on this welcomed.

Steve
Tony  Polson - 16 Dec 2006 11:01 GMT
>>The two largest manufacturers of light meters both offer it - Sekonic
>>and Gossen.
>
>Interesting.   I'm currently wondering how well this works in modest
>macro situations, subject distance maybe a foot or a bit less.
>Comments on this welcomed.

I think that would be asking an awful lot of this technique.  

In that situation, using your Nikon DSLR as a meter might be the best
(or the least worst) option, but you would be well advised to bracket
widely as well.  

Is shooting digital really not an option?  Renting a Canon 1Ds MkII
and a lens might be quite cost-effective, given that you can review
your results on the spot.
Steve - 16 Dec 2006 22:23 GMT
>Is shooting digital really not an option?  Renting a Canon 1Ds MkII
>and a lens might be quite cost-effective, given that you can review
>your results on the spot.

This is only amateur stuff for fun, so it will be with what I have
which is the Mamiya RZ on 120.  I rather suspected reflective metering
for macro might not be viable.   Will look at the TTL off the screen
flash and DSLR options.  Some bracketing isn't a problem, it was just
that with 6x7 on 120 you want to have a good idea of the exposure
first, given the limitations on film available.

Steve
Tony  Polson - 16 Dec 2006 23:44 GMT
>>Is shooting digital really not an option?  Renting a Canon 1Ds MkII
>>and a lens might be quite cost-effective, given that you can review
[quoted text clipped - 6 lines]
>that with 6x7 on 120 you want to have a good idea of the exposure
>first, given the limitations on film available.

If it is for fun, why not do it once to learn the technique, and a
second time when you know the technique works?  

A few test shots should tell you all you need to know, and you only
need to pay for the film to be developed; you can work out whether
your exposures are in the right ball park from the negs without any
need to have them printed.
dadiOH - 19 Dec 2006 14:27 GMT
>> Is shooting digital really not an option?  Renting a Canon 1Ds MkII
>> and a lens might be quite cost-effective, given that you can review
[quoted text clipped - 3 lines]
> which is the Mamiya RZ on 120.  I rather suspected reflective
> metering for macro might not be viable.

Whether or not the subject will be "macro" has nothing to do with
taking a light reading.
_______________

> Will look at the TTL off
> the screen flash and DSLR options.  Some bracketing isn't a
> problem, it was just that with 6x7 on 120 you want to have a good
> idea of the exposure first, given the limitations on film available.

Then back your light(s) off a way so you can use guide numbers with
some accuracy and adjust that for bellows extension.

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Steve - 19 Dec 2006 17:36 GMT
>Whether or not the subject will be "macro" has nothing to do with
>taking a light reading.

>Then back your light(s) off a way so you can use guide numbers with
>some accuracy and adjust that for bellows extension.

Thanks for the input.  

I actually shot 3 test rolls yesterday, sadly being MF colour film it
will be after Christmas before I can check the results.  What I tried
on that occasion was first taking an incident light reading with a
standard meter positioned at the same distance from the light (a
softbox) as for the shoot, but outside of the tank, then just used the
f22 setting it gave me.  I bracketed a few 1 stop either side. Be
interested to see what we get.

Steve
Steve - 20 Dec 2006 01:03 GMT
>I actually shot 3 test rolls yesterday, sadly being MF colour film it
>will be after Christmas before I can check the results.  What I tried

Here's a digital shot taken tonight which gives a view of the subject
matter I'm working with for those curious. This is a Nikon D50 flash
exposure at f16, wonder how that translates to that Ektachrome 120 at
f22, yesterday's exposure.   I would very much like to do better than
this, and in MF, but it's quite a challenge as (moving) subjects go.

http://www.risedale.com/nonpublic/clownfish.jpg

Steve
PRO SHOW_SS - 23 Dec 2006 04:33 GMT
so does a MINOLTA  AUTO METER IV
 
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