Digital SLR Cameras » Sigma EM-140 DG Ring Flash for Nikon

Sigma EM-140 DG Ring Flash for Nikon

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WebCode: 230560 Mfr item: EM140DGN

Price:	$529.95

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Sigma EM-140 DG Ring Flash for Nikon

Multifunctional Macro Flash designed to work with Digital & 35mm Film SLR cameras

ELECTRONIC FLASH MACRO EM-140 DG is designed to work with both AF 35mm film and Digital SLR cameras of all-popular manufactures. The EM-140 DG Macro Flash 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 modeling, which can give a three-dimensional feeling to the subject. The flash features a guide number of 14 w/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, where 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. 55mm and 58mm adapter rings are included with the flash. 52mm, 62mm, 67mm, 72mm and 77mm adapters are sold separatly.

Key Features

Ideal for Close-up photography, especially medical and scientific applications.
Fully dedicated with the latest TTL auto exposure systems.
Dual flash tubes can be switched on or off for creative flash control
Wireless TTL Flash Control
High Speed Synchro Flash
Guide Number of 14/m, 46/ft (ISO100)

All About Sensor Sizes

The sensor size affects many factors in your images and the functions of your camera body. It has a major impact on the quality of your image, how your lens functions, and how it performs in low light conditions.

There are three basic size categories for sensors: Four Thirds, APS, and Full Film Format. As noted in the chart below, the smaller sensors are used in point and shoot cameras while the larger ones are found in DSLR models.

Four Thirds sensors have become a standard for Olympus and Panasonic at a size of 13.5mm by 18mm, while APS sensors are close to that of the original APS film size. Most DSLR cameras fall into the APS size range (14mm by 21mm to 16mm by 24mm), often described as 1.5x, 1.6x, or 2.0x crop factors.

Sensors that are the same size as 35mm film format are also called full-frame sensors. This full frame sensor allows you to use lenses without the complication of focal length magnification factors and produce the highest quality images in DSLR cameras. The sensor size is a true 24mm by 36mm, just like a frame of 35mm film.

Read Digital SLR Buying Guide

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