Kenko PRO 300 3.0x

Overview

Placed between the camera body and lens, a teleconverter contains a set of optics that will effectively increase the Focal length of a lens by a specific amount. Common magnifications are 1.4 times and 2 times, but the Kenko Teleplus PRO 300 AF converter has a 3x magnification. For example, using a 3 times (3x) teleconverter will increase the focal of 300mm lens to 900mm.

The Teleplus PRO 300 converter is made with high quality multicoated optical glass supplied by Hoya Corporation, the worlds largest manufacturer of optical glass. The PRO 300 3x is designed for use with lenses of 50mm or above and work best with telephoto lenses of 100mm to 500mm. The PRO 300 3.0x can be used with telephoto Zoom lenses as well as prime lenses. However, Kenko does not recommend them for lenses that have a zoom range that starts under 50 mm.

KENKO PRO 300 AF Teleplus converters have genuine Gate Array IC (Integrated Circuitry). It means that the converter�s unique circuitry maintainS signal integrity between the camera body and lens. These converters are designed to electronically operate the same way an original manufacturer�s converter would provided there is enough light available.

Important Note: Due to the 3 stop light loss inherent in a 3x converter, Kenko states that the PRO 300 3.0x converter will not auto focus with lenses that have a smaller aperture than f/2.8. With all lenses having apertures smaller than f/2.8, Kenko recommends using the PRO 300 3x in manual focus mode.

Lens Specifications

Details

Model: Teleplus PRO 300
Lens Type: Converter
mounting_type: Canon EF
Camera Magnify Power: 3
lens_system_special_functions: Tele

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User Lens Reviews

Average user rating from: 2 user(s)


Overall rating (weighted)		3.6
Sharpness		3.5
Build Quality		4.0
AF Speed		3.5
Value for Money		3.5

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1 of 1 people found the following review helpful

Pretty good quality, excelent magnification, Monday, 21 May 2007


Overall rating (weighted)		4.0
Sharpness		5.0
Build Quality		5.0
AF Speed		3.0
Value for Money		3.0

I have actually used this product and uploaded some pictures. I was trying to avoid buying a Canon EF 600mm f/4L IS USM Super Telephoto Lens for $7200 to $12,000 dollars!!!! I'm sure it's not as good as a 7200 dollar lens, but it's way cheaper. I have used this hand held with an IS lens, but it does way better with a tripod over long distances. I used this with a canon 70-200 mm f/2.8 L IS. The shutter speed in day light decreased from 1/4000 to 1/2000 at f/2.8. The only thing I don't like about this item is that my lens sometimes will not auto focus with the extender attached. Other than that, it's pretty good.

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0 of 1 people found the following review helpful

Not for action photography, Friday, 17 December 2004


Overall rating (weighted)		3.3
Sharpness		2.0
Build Quality		3.0
AF Speed		4.0
Value for Money		4.0

I'm going to state up front that I haven't used this 3x teleconverter. I have no idea whether it has acceptable optical quality or not. The idea of a 3x teleconverter sounds very promising and nifty, but there is a large tradeoff involved. If you use this teleconverter, the effective aperature of the lens you are using will go up be three stops. This makes for eight times less light entering the camera lens, resulting in shutter speeds that are eight times slower than the lens would achieve without this teleconverter.

Most long telephoto lenses need all the light they can get, even expensive, high end lenses with image stabilization do. If, say, your lens's maximum aperature is F4 without a teleconverter, it will become F11 with any 3x teleconverter. A fast F2.8 zoom would become an F8 zoom, and the long focal length will exaggerate any vibration of the camera or motion in a much more noticable manner (Most camera bodies will not autofocus with an F8 lens, although some will). If you use this lens with a very large aperature prime lens (F2 or better), autofocus will still work, and shutter speeds might be reasonable, but capturing action would still be a difficult ordeal.

Because of these limitations, I would strongly recommend against this for anyone that intends to shoot any action with it at all, a tripod is an absolute must, and it would be most useful for taking pictures of still objects on a bright day. A smaller 1.4x teleconverter would be much more appropriate to those shooting sports and in situations other than bright and sunny.