Is the Sunpak E-TTL Digital Flash Unit Compatible with Pentax 20D?
Companies such as Sunpak build multi-dedicated flashes, which are designed to be used with various camera brands, rather than a single brand. Sunpak's external flashes are mostly designed to work with Canon, Nikon and sometimes Sony cameras.
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Sunpak E-TTL Flashes
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Sunpak produces a number of E-TTL external flash units, including the RD2000, PZ42X, PF30X and PZ40X. These flashes are designed to work with the E-TTL flash control mode, which is used on Canon digital single lens reflex (DSLR) cameras.
Pentax K20D Specifications
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According to Digital Photography Review, the flash control mode for the internal flash on the Pentax K20D DSLR is P-TTL. The external flash hot shoe on this camera model is designed to work with Pentax-dedicated flashes, which means those external flash units that are manufactured by Pentax, and some made by third-party manufacturers.specifically to work with Pentax.
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Compatibility
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None of the E-TTL Sunpak external flash units on the product section of the company's website are explicitly described as working with the Pentax P-TTL flash control mode. Though these flashes could be used with a Pentax K20D in manual mode, they would not be capable of utilizing through-the-lens metering, so an external light meter would be required.
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References
- Photo Credit dSLR camera flash mounted as a slave image by dinostock from Fotolia.com
