Reviews and Problems with Kenko 3x Pro 300 DG Teleconverter
Showing 1-5 of 5
Value for money 4
10 April 2007
Summary: I have used this teleconverter with a nikon 180/2.8 ED and a Tamron 90 mm/2.8 macro. Both lenses are well known for their extreme sharpness and good contrast. With the 180 mm on a digital DX-size sensor you obtain 180 x 1.5 x 3 = 840 mm of focal lenght.
Pros: You will get that distant bird or rabbit full frame, just not sharp, autofocus did still work on my D200, though slow and not always 100% accurate
Cons: very visible loss of contrast with good lenses, very visible loss of sharpness. With 10 megapixels an enlargement and a 2 x teleconverter will probably give a better end result.
Summary: This review is based on the use of Nikon F80/N80 and Nikon 2.8/300 AF lens, using Fuji slide film and a tripod. According to the encouraging results of the shorter Kenko converters with this particular setup, I went lunatic and procured the 3x converter to get up to 900mm effective focal length.
Pros: Identical good build quality like other Kenko Pro300 converters., No observable vignetting., No change to coulour rendition., Fits well and works with Nikon mechanical AF lenses., Reasonable sharpness.
Cons: Visible reducion of contrast., Requires careful exposure metering, as it appears to over-expose slightly., Not good enough for people addicted to top quality.
Summary: Let me start by answering the question anybody who's considering purchasing this 3x TC is asking himself/herself: yes, it is for real and it *does* work. Optical quality is very good, expect the same results as a good third-party 2x TC, BUT (here's the usual big but when anything seems too good to...
Pros: - 3x, - Good/solid construction, - Good glass/optical quality, - Affordable price (around $200 on Ebay from several vendors.)
Cons: - Loss of 3 f-stops, - Autofocus useless on lenses with max aperture smaller than f/2.8, - Extremely sensitive to vibrations (tripod, fast film and stopped mirror obligatory to get decent results.)