Exceptions would be older lenses for Nikon which might not have a built-in focus motor (which cannot be added to an older lens) therefore such lenses could be used in Manual Focus mode only with Nikon cameras such as the D5000, D3000, D60, D40X, etc. An upgraded Sigma lens is generally fully compatible with the newer D-SLR cameras. The part required is proprietary for each different model lens so you would have to contact Sigma and determine if your lens still can be upgraded. However, if the Sigma lens has been discontinued too long, the part needed may no longer be available. Lenses older than about four years will require a change of a ROM “chip” and there is no charge for this service the company told me. For recent lenses this upgrade may only be a firmware change. Conversely, many older lenses with either Canon or Sony (Minolta) mounts require some type of upgrade. Most older Sigma interchangeable lenses can be used with many different brands of digital cameras (Nikon and Pentax) having a compatible mount. They will work, but just won’t have autofocus capability. The Nikon D5000, D3000, D60, D40, and D40X do not have a focus motor in their camera bodies therefore even some newer lenses will not be fully operational with these cameras. There are some exceptions in functionality such as autofocus and auto aperture. Most older Phoenix lenses will work OK with newer D-SLRs having the same mount. To use the older Pentax S-mount lenses on a Pentax D-SLR you must use a Pentax Mount Adapter B.Ī Pentax K20 D-SLR with an older M-series Pentax 50mm lens attached. Caution: If using older lenses without an “A” on the aperture ring in AV (Aperture Priority) mode, an exposure error may occur. In addition, even older Pentax K-mount, M-series, and S (Screwmount) lenses without the auto-aperture feature (an “A” on the aperture ring) can be used in Manual Exposure mode using stop-down metering and manual focus. Pentax A-series lenses (those having an “A” setting on the aperture ring) can be used as manual focus lenses in all Exposure modes on Pentax D-SLRs such as the K10D, K200D, K20D, or K2000. It seems that owners of older Pentax lenses retain some of the best operating compatibility with their new Pentax (and Samsung) D-SLR cameras. They caution that since the OM series of lenses were originally designed for film instead of a digital sensor, the image quality might not be comparable to the newer Zuiko Digital lenses. If the older lenses are mounted on an E-System camera having built-in image stabilization, the OM-series lenses may utilize this function-provided the firmware in the D-SLR body has been updated. An Olympus E-P1 (Micro Four Thirds camera) with an older OM-series Zukio Digital lens attached and an E-620 (Four Thirds camera) with an older OM-series 16mm fisheye lens attached, plus the OM MF-2 adapter needed to use these lenses shown between the cameras.
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