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Old 20-06-2011, 13:50   #1 (permalink)
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Macro flash ring

Hoping someone can help me out here when using a flash ring for macro shots when ready to use it would you underexpose the shot to allow for the light from the flash if that makes sense
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Old 20-06-2011, 15:42   #2 (permalink)
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Re: Macro flash ring

I have an MT-24,,,I would say from my own experience that you can do both. Lower the light flash and camera exposure,,mix and let flash is my two cents I hurt my knee and gave up macro for awhile, buy i have been doing more lately as I roll around trying to get up instead of just falling asleep on the ground waiting for a helping hand.
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Old 20-06-2011, 15:53   #3 (permalink)
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Re: Macro flash ring

Oh this is a minefield...what are you attempting to do ?

I have a MT-24ex - however the principle should be the same. Theoretically if you have TTL or E-TTL flash it should roughly work it out automagically when using Aperture Priority Mode.

Assuming your just using this people sometime dial in Flash Exposure compensation on the lens to reduce / increase flash from the metering default. Should be on a modern camera somewhere.

I've recently been experimenting with using the flash as more of a fill. So set my flash sync to auto on the camera (uses the natual light setting in AV mode) and dial the flash power on the flash (i.e set manual flash power) right down. Works if the subject is not moving too much.

Also you can set the flash power manually instead of using the Flash Exposure compensation. This I do if subject is in a known setting. Often testing if bug shooting - by shooting a leaf in same light and then checking the exposure of flash on camera - before moving to bug on similar leaf. Note when using this method I use the flash fixed speed setting on the camera (1/250) in the case of my 50D. The flash is really controlling the exposure here, giving a much faster effective shutter speed, allowing you to freeze those fast moving bugs.


I wrote this last Feb - Experimenting with Flash when I was trying to get subject to look more natural lit than black backgrounds, and I really must add a new article following further changes.
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Old 20-06-2011, 15:58   #4 (permalink)
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Re: Macro flash ring

I should add. I'm still experimenting on flash, and will have to try underexposing.
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Old 21-06-2011, 13:36   #5 (permalink)
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Re: Macro flash ring

Lying down on the job again Boofers, cheers guys & thanx for the link will have a look at that, ring flash i am using at the minute is the Starblitz 1000 Auto Macro-Lite with 18mm tube & lens, it is non metering with the tube so have to work out the metering my self till someone takes pity on me & gets me a nice Kenco set, so am not to sure how to go about setting anything for the flash because of this.

Starblitz Macro Automatic Flash Unit
Model
1000 Auto Macro-Lite
Guide No. (ISO 100, m)
5
Angle of Coverage
80 Degrees
Auto Setting
f/5.6
Auto Effective Range
30 ~ 95 cm
Auto Power Off
Green Light Turns Off when or After Flash is Fully Charged
Flash Rotation
360 degree possible
Ready Light
Red Ready Light Blinks when Fully Charged
No. of Flashes
120 with Alkaline Batteries
Applicable Focal Lengths
50mm up
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Old 21-06-2011, 14:52   #6 (permalink)
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Re: Macro flash ring

I guess you're going to have to experiment.

I googled your flash - "An exposure table for 50mm lens is printed on the back of the flash unit for your quick reference. The package comes also with a detailed instruction manual including not only the usual full user guide and specifications of the flash, but also the exposure tables for 50mm, 60mm, 70mm, 80mm, 90mm and 100mm lenses. It is a perfect guide for learners of fundamental photographic skills."

On the top site selling it - do you have that ?

I'd suggest experimentation - as when you have the tube and macro lens on - you should be at the same focal distance. Set the flash to manual (I assume it has some manual power setting) and a set aperture in camera - fix the ISO. Take some shots a various flash power and see what they come out like.

You should then at least be able to use a set flash power to the aperture / ISO combination. You may find different subjects - eg darker / lighter may need some form of adjustment. (I'm not sure if you'd get away with just exposure compensation - or just move the flash power up/down or ISO or Aperture).

Or I could be completely wrong.
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Old 23-06-2011, 14:36   #7 (permalink)
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Re: Macro flash ring

Sorry wasnt about yesterday chrisa , thanx for info
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