Would this work with a Zuiko 4/3 50-200mm 2.8-3.5 WITH a 4/3 to M4/3 adapter? (on a M4/3 camera)

No, this converter is designed to work with two lenses, the 40-150 pro f2,8 and the yet to be released 300 f4

its works for olympus digital 40-150?

Hello Marco, the MC-14 will work with the Olympus 40-150mm f/2.8, but not with the Olympus 40-150mm f/4-5.6. The MC-14 also works with the Olympus 300mm f/4.0.I use the MC-14 with the Olympus 40-150mm f/2.8 and am very pleased with the results. All the best.

Would this lens work with the m. zuiko ed 12-40 mm f2.8 pro lens?

No, it does not work with the 12-40mm. I have both, and this teleconverter protrudes into the lens and is only compatible with lenses with a recessed rear element. On the 12-40mm, the rear element is flush with the lens mount, and the teleconverter cannot be attached. It will work with the 40-150mm PRO and the new 300mm PRO. I've also used it with an old Nikon 300mm with an adapter, and it may work with some other lenses not acknowledged by Olympus. But be careful, you don't want to damage your lens.Note, the other replies are referring to a different teleconverter from the one shown here, made for a different mount.

Does this come with a manufacturer’s warranty?

I believe it is one year if purchased new from an authorized vendor. It can be extended four years if your purchase an extended warranty within the original warranty period. If you are in the US, I have heard that products purchased from international vendors may come with a warranty but may be difficult to enforce if a problem develops.

ASIN	B00NGSLSOK
Best Sellers Rank	#110,023 in Electronics ( See Top 100 in Electronics ) #797 in SLR Camera Lenses
Brand	OM SYSTEM
Built-In Media	LENS
Camera Lens	300 millimeters
Camera lens description	300 millimeters
Color	Black
Compatible Camera Mount	Four Thirds
Compatible mountings	Four Thirds
Customer Reviews	4.5 out of 5 stars 113 Reviews
Exposure Control Type	Automatic
Focal Length Description	420mm
Focal length description	420mm
Focus Type	Auto Focus
Global Trade Identification Number	00050332188792, 04545350047849
Image stabilization	Digital
Iso Range	100-25600
Item Weight	104 g
Lens	Teleconverter
Lens Coating Description	ZERO Coating
Lens Design	Zoom
Lens Fixed Focal Length	300 Millimeters
Lens Mount	Four Thirds
Lens type	Teleconverter
Light Sensitivity	100-25600
Manufacturer	Olympus
Maximum Aperture	4 Millimeters
Maximum Focal Length	150 Millimeters
Maximum focal length	150 Millimeters
Media Type	ProductImage
Minimum Focal Length	1 Millimeters
Model Name	zuiko
UPC	050332188792 083922912538
Viewfinder Type	Electronic Viewfinder
Water Resistance Level	Not Water Resistant
Zoom Ratio	1.4:1

OLYMPUS OM SYSTEM MC-14 1.4X Teleconverter for the M40-150mm and 300mm f4.0 PRO Lenses (Black)

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