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The following opinions have been automatically translated with Google Translate.
Pros:Quality Optics - weight and dimensions - price
Cons:of canon can only be used to f. 5.6 - AF fast but not as much as you would like - AF does not hold the doubler - I do not like the Booken
Opinion:Optical dated but only economic alternative to the legendary Canon 400 f. 5.6 where as the yield is not very different - very good but even at f 5.6 on canon, having cip old version enables you to manage partitions only on the bodies + 1D old - so just f --- otherwise. 5.6 or the room indicates ERROR - the optical performance is good, at least up to distances of 10 / 15mt then begins to decline, although not conspicuously --- just does not hold the doubler unless strong conditions of light and contrast; a shame because the quality loss (1.4 x kenko) is not so drastic! Focus min. 1.6 meters ... a record that expands the possibilities of use in the field or close-up close-ups in passerines confidants - note: a Racconigi (temperature in the early morning in January of -2 °) I had to wait 10 xchè everything was locked - I was told because of the internal lubrication obsolete, which tends to harden with cold - seems to be common practice to send it to a photo-repairer x re-lubrication with appropriate products - I do not like the Booken (reminds me vagamentity a catadioptric) --- In conclusion, the awareness of being in front of a product of approximately 20 years and so no spare parts in case of failure, with a ridiculous price you would take home a glass of good quality, versatile and manageable, x open the doors to nature photography without having to accept the trade-offs of the various 50-500 or 150 to 150 not being able to get there (economically) to the legendary Canon 400 --- update to a few months away in October 2014: the problems of locking the AF have been resolved by a photo-repair (nothing to do lubrication), 1d III of the AF works even with kenko 1.4X while slowing, but nothing dramatic since versions x Canon has a good reactivity - confirm the progressive deterioration in the fluidity of extraction hood due to the softening of the rubber coating - no problem of F / B will focus on 50 of them on 1d III --- optics optimized for short distances 3 / 7 mt ... well, the quality tends to decline progressively, better not go beyond 10-15 meters (probably tends to pay theforcing in a "macro" to 1.6 mt) --- today I consider it a good buy
The following opinions have been automatically translated with Google Translate.
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