What’s the difference between the af3 a and the af3 b?

Af3 a has metal mounts and af3 b is the cheaper version with plastic mounts. Generally speaking both are identical otherwise but the metal mounts are probably more durable

Will these work with the full frame Sony A7R mk3?

They work with the A7rII OK so I don't see why not. If you've never used extension tubes before they take some getting used to, the focus range gets weird and a little unpredictable and I usually end up in manual focus mode, also don't expect the results you'll get from a dedicated macro lens... But saying that they are a useful addition to the bag, and I've got some nice shots with my 55mm SE f1.8.

I am using af3a on sony A7rii. I don't get manual or auto focus with sony 24mm and tamron 28-75mm. Are there any lenses which work with this?

I use the standard Sony lens that comes with the A7... its very sharp. Recommend a tripod

Will this work on a sony a390?

Compatible with: MK-S-AF3A/MK-S-AF3B Full Frame camera such as A7 A7R A7S A7II A7RII A7M2 A7SII A9 A7III A7RIII etc APS-C such as NEX3 NEX3N NEX5 NEX5T NEX5R NEX6 NEX7 A5000 A5100 A6000 A6100 A6300 A6400 A6500 etc MK-S-AF3C-BLACK/MK-S-AF3C-RED/MK-S-AF3C-BLUE APS-C such as NEX3 NEX3N NEX5 NEX5T NEX5R NEX6 NEX7 A5000 A5100 A6000 A6100 A6300 A6400 A6500 etc

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Description

🔬 Elevate your macro game—see the unseen in stunning detail!

CREATIVE MACRO MASTERY - Perfect for shooting insects, flowers, and tiny details that make your portfolio pop.
DUAL EXTENSION LENGTHS - Switch between 10mm and 16mm tubes or stack both for ultimate macro reach.
LIGHTWEIGHT PORTABLE - Compact plastic body with metal bayonet mount—carry your macro setup anywhere.
SEAMLESS AUTOFOCUS SUPPORT - Capture sharp, detailed close-ups without sacrificing speed or accuracy.
UNIVERSAL SONY COMPATIBILITY - Works flawlessly with a wide range of Sony mirrorless cameras from A5000 to A9.

The MEIKE MK-S-AF3B is a lightweight, dual-length macro extension tube adapter designed for Sony E-mount and FE-mount mirrorless cameras. Offering 10mm and 16mm extension tubes that support autofocus, it enables photographers to capture sharp close-ups of small subjects with ease. Compatible with both APS-C and full-frame Sony models, this adapter is a must-have for creative macro photography on the go.

Specifications

Package Dimensions L x W x H	7.2 x 6.9 x 6.7 centimetres
Package Weight	0.1 Kilograms
Item Weight	0.15 Pounds
Brand	Meike
Camera Lens	The Meike MK-S-AF3B is a versatile extension tube adapter designed for Sony mirrorless cameras, offering two lengths (10mm and 16mm) for closer focusing and higher magnification. It's compatible with E-mount APS-C and Full Frame cameras, supporting autofocus and all camera shooting modes. The adapter requires exposure compensation and is ideal for macro photography, allowing users to capture close-ups of small objects, insects, flowers, or more.
Colour	MK-S-AF3B
Max Focal Length	26 Millimetres
Min Focal Length	17 Millimetres
Part number	MK-S-AF3B
Size	MK-S-AF3B
Water Resistance Level	Not Water Resistant
Zoom Type	Prime
Lens Design	Prime
Focus type	Auto/Manual
Guaranteed software updates until	unknown

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