Old Bigma Vs New Bigma.July 10, 2007So what's the difference between the new Bigma (or rather the current Sigma 50-500 mm lens) and the old? No one seems to know for sure. The guy at Phototechnica did tell me that the new one focuses better. He says with the older lens, autofocus went haywire close to the 500 mm end. That apparently has been addressed with the new bigma but you don't find any mention on it on their site. It's darn hard to find information on the old Bigma. There is no mention of the older '50-500mm F4-6.3 EX RF HSM' lens on the sigma site. It's at times like this that the way back machine comes in very handy. It had a cached page from 2005 with information on the older model. Comparision with the new model ( APO 50-500mm F4-6.3 EX DG HSM) doesn't reveal much. This is all that the sigma website site is willing to say: DG (DG Lens) These are large-aperture lenses with wide angles and short minimum focusing distances. With an abundance of peripheral illumination, they are ideal lenses for Digital SLR Cameras whilst retaining suitability for traditional 35mm SLRs.
With Nikon DX it's very clear that you don't get the 1.5x multiplicative factor that you find if you plug in an older lense into a nikon DSLR. It seems that the Bigma on the other hand will act like a 750mm lense when it's attached to a Nikon digital SLR. There is one way to find out.... Posted by raditha at July 10, 2007 8:56 AM
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