Sigma EM-140 DG Macro Ring Flash for Nikon SLR Cameras – Product Description:
The Electronic Flash Macro EM-140 DG is designed to work with both AF 35mm film and digital SLR cameras of all popular manufacturers. It is ideal for photographing subjects in fine detail when the shadowless mode is used and is extremely effective for scientific and medical applications. Dual flash tubes can fire simultaneously or separately. Using only one flashtube creates shadow, which can give a three-dimensional feeling to the subject. The flash features a guide number of 14 with ISO 100. The Modeling Flash function makes it possible to check for reflections and shadows before actually taking the flash picture. A wireless flash function is also available, when the EM-140 DG is used as master and the EF-500 DG Super as a slave unit for creating fine shadow details. High-speed synchro and exposure compensation functions are also available for advanced flash photography.
- Ideal for close-up photography, especially medical and scientific applications
- Fully dedicated with the latest TTL autoexposure systems
- Flash tubes can be switched on or off for creative flash control
- Wireless flash control
- High-speed synchro flash
- Guide number of 14 (ISO 100)
|Product Features :
Sigma EM-140 DG Macro Ring Flash for Nikon SLR Cameras – Review:
EXCELLENT RING FLASH FOR DENTISTRY!
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.