Can I guess exposure with my flash on my manual film camera?
So I have a Hasselblad 500cm and a yn460ex flash on it via pc port and I have a metering app on my iphone but then the flash would mess it up so should I just underexpose a few stops and just guess which power number seems right on the flash or is there a better way? If it is underexposed can it just be dodged or burner back during printing?
Unless you use the guide number of the flash and calculate the lens aperture you need to get the proper exposure, you can either buy a flash meter or use the try and fail method to guess the exposure (NOT recommended since you will burn a lot of film in the effort)
The metering app is for using the existing light only.
You need to always get the best possible exposure if you want a prayer of producing good prints in the darkroom. Have you ever done a nine negative test? If you have, refer back to the results of trying to print from an underexposed, normally developed negative
I highly suggest you invest another $170 and get this ambient / flash light meter. It will solve your exposure issues now and in the future.
http://www.bhphotovideo.com/...Meter.html
steve
PS… I have this meter and it is accurate, small, dependable, and very easy to use.
First, relying on a darkroom to dodge and burn is the same as relying on photoshop for a poorly composed and exposed image.
ALWAYS DO EVERYTHING POSSIBLE TO GET IT RIGHT ON THE NEGATIVE.
It is very possible to guesstimate and get it right but you really need to know your equipment. I always have a light meter with me to learn how to accurately read the light and it has been a reliable teacher.
PLANNING STAGE
Know your working distance. (Between flash and subject)
Know what iso/Asa you will be using.
Know the aperture you will be shooting at.
TESTING
You can cheat with a digital camera or use a light meter. At that distance and aperture, how much power do you need?
APPLICATION
In your environment, you can't change working distance without changing power. So wait until you have enough experience. To make adjustments to your calculations.
Just control the background by adjusting the shutter speed.
MY SETUP
I use an efx20 on a number of different rangefinders and sometimes on a mamiya c220. My base working distance is 1m. Asa 640. At f11
Indoors I use 1/30th outside I go as fast ad my camera will allow.
As Ace said, it would help if you knew your flash's guide number. The manual says 33', but most testers find it closer to 24' at ISO 100.
You can use the GN in the following way: GN = distance × f-number
So at f/8, ISO 100, the flash would need to be 3' from the subject for proper exposure.
If you want to under expose the flash by a stop, you would move the flash to 4.2' away (inverse square law.)
Manually using a flash isn't impossible, but you need to understand a little about math and f-stops.
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