Автор: sidthesloth
Дата: 14-12-11 00:54
CF при Tamron, ако не бъркам много, означава constant focus - при настроен фокус върху обекта осигурява постоянен фокус (стига да не се завърта и фокусния пръстен на обектива) при "зумване". Особено подходяща функция при заснемане на видео!
The "CF" Designation:
Many people misinterpret Tamron's "CF" designation to stand for "Close Focus". Tamron's "CF" designation actually stands for "Continuous Focus", meaning that the lens has the ability to continuously focus from infinity to macro mode. Some CF zoom lenses had this CF ability regardless of the set focal length, while other CF zoom lenses featured internal cams which would automatically zoom the lens towards a specific zoom setting as the focus ring was turned. This latter feature was referred to as the Minimum Object Distance (M.O.D.) Selector System. The M.O.D. feature was certainly much more convenient than having to press a "macro" button, as found on many similar competing lenses, in order to go into macro mode. Needless to say, M.O.D. increased the cost of a Tamron lens due to the extra internal focus/zoom coupling mechanisms. But once you used a Tamron CF lens which featured the M.O.D. Selector System, you were hooked due to the extraordinary convenience of the Tamron design. The CF designation has now been discontinued by Tamron, but older CF lenses were simply marked with the letters "CF MACRO" somewhere on the lens barrel (usually above the aperture ring).
ИЗТОЧНИК от менюто вляво се избира "Tamron Lens Nomenclature")!
Последно - предлаганият в темата обектив е за Contax/Yashica. Това не пречи на всеки, който има или придобие друг adaptall (оригинален или не байонет за обективи Tamron), да ползва обектива на съответната система - Canon FD/EOS, Nikon F, Pentax K, M42 и т.н.
Публикацията е редактирана (14-12-11 01:18)
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