Pentax Full-Frame
Napsal: 14 čer 2008, 10:32
...hledal jsem, kam bych to šoupnul, ale nenašel jsem nic příhodného, tak zakládám nové téma...
...jsem našel zajímavou stránku, kde je odvážné tvrzení... ale pokud by to tedy skutečně byla pravda - jak jsme to zde párkrát probírali (a propírali
) - tak... ...ale závěry nechám na vás 
Full-Frame
At the time of this writing (January 2008), all Pentax DSLR's use a 16mm x 24mm sensor which is smaller than the traditional frame of 35mm film (24mm x 36mm). Though larger sensors will almost certainly be introduced eventually, there will be a market for the more economical reduced frame sensors for a long time to come, so in 2004 Pentax began producing some lenses specially for this format. The reduced-image-circle lenses were introduced with the "DA" lens series, so at first everyone assumed that all lenses in the "DA" series series would produce reduced image circles incompatible with full-frame cameras. This turns out not to be the case.
The DA 70mm f/2.4 Limited, DA 40mm f/2.8 Limited, DA*200mm f/2.8, DA*300mm f/4.0 and DA 35mm f/2.8 Macro are full-frame lenses. However, some of the other DA lenses (mostly the shorter focal lengths) are known to produce image circles that are too small to be used with full-frame cameras.
For the time being this ambiguity is of importance only to the few people who want to use these lenses on film cameras (because these lenses have no aperture ring, these lenses are unusable with many film cameras), but it will be of more significance when the inevitable full-frame digital camera arrives. My best guess is that you shouldn't look for it in less than 2 years (2010), but with the announcement of the Sony full-frame camera in 2008, timelines may get advanced...
...odkaz na tu stránku: http://www.robertstech.com/compat.htm ...jedná se o druhou a třetí tabulku
...jsem našel zajímavou stránku, kde je odvážné tvrzení... ale pokud by to tedy skutečně byla pravda - jak jsme to zde párkrát probírali (a propírali
) - tak... ...ale závěry nechám na vás Full-Frame
At the time of this writing (January 2008), all Pentax DSLR's use a 16mm x 24mm sensor which is smaller than the traditional frame of 35mm film (24mm x 36mm). Though larger sensors will almost certainly be introduced eventually, there will be a market for the more economical reduced frame sensors for a long time to come, so in 2004 Pentax began producing some lenses specially for this format. The reduced-image-circle lenses were introduced with the "DA" lens series, so at first everyone assumed that all lenses in the "DA" series series would produce reduced image circles incompatible with full-frame cameras. This turns out not to be the case.
The DA 70mm f/2.4 Limited, DA 40mm f/2.8 Limited, DA*200mm f/2.8, DA*300mm f/4.0 and DA 35mm f/2.8 Macro are full-frame lenses. However, some of the other DA lenses (mostly the shorter focal lengths) are known to produce image circles that are too small to be used with full-frame cameras.
For the time being this ambiguity is of importance only to the few people who want to use these lenses on film cameras (because these lenses have no aperture ring, these lenses are unusable with many film cameras), but it will be of more significance when the inevitable full-frame digital camera arrives. My best guess is that you shouldn't look for it in less than 2 years (2010), but with the announcement of the Sony full-frame camera in 2008, timelines may get advanced...
...odkaz na tu stránku: http://www.robertstech.com/compat.htm ...jedná se o druhou a třetí tabulku
. Už abych ji měl doma, nemůžu skrz to spat
Sigma 24-70. Obrázky objektivu jsem strčil do galerie:
Tak som sa rozhodol pre Tamrona 28-75/2,8. Je ľahší