Customer Review

69 of 75 people found the following review helpful
5.0 out of 5 stars Excellent ring flash for dentistry, November 25, 2007
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This review is from: Sigma EM-140 DG Macro Ring Flash for Canon SLR Cameras (Electronics)
I have employed my Rebel XT digital SLR into my dental office. I upgraded to the Rebel XTi (10 mpixels) for home. I purchased the Sigma ring flash with a Sigma macro lens for the Canon SLR family. If you look at the Lester Dine website this is basically what they sell for a few hundreds dollars more.

I compared the ring flash and lens with the ones offered by Canon and felt that it was worth saving $300 by purchasing the Sigma combo.

The macro lens/ring flash work well for dental purposes. After a little experimentation I discovered that I get the best images by using the aperature priority setting. All settings are used with ISO 400 speed. I set the aperature at 14-16 for intraoral shots. This gives the best depth of field. I also use the operatory light for intraoral shots. I set the aperature to 6 for full face shots.

I use autofocus but set the ratio to 1:2 to 1:3 for intraoral shots. This keeps the autofocus from "hunting". I frame the shot by moving towards the subject. Once I get close to the image that I like I use the autofocus to get the final focus for the picture.
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Showing 1-1 of 1 posts in this discussion
Initial post: Nov 17, 2011 11:27:21 AM PST
Fatma says:
I just got my flash and am planning to use it with my D7000 for intra-orral purposes.. im a bit worried because its the first time i'm using and external flash..hope your settings will be useful, thanks..
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Location: North Canton, Ohio United States

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