300mm Lens To 400mm Adapter
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Related Faq
Q
Is there a firmware upgrade for this adapter? I just bought one and the AF doesn't work with my Tamron 70-300mm. It works with my Canon 50mm
A
Did you find a solution to this I have the same problem? 
Q
Will this work on an Olympus 100-400mm IS?
A
The Olympus 100-400mm IS lens size is 72mm, please reconfirm the number mark as "ø" (diameter) symbol, if the number is 72, just need to order same 72mm size filter ,thanks. 
Q
I have a Minolta lens, can i use this adapter?
A
Could you please update us your full Minolta lens model ?as Minolta has MD MC and AF mount, K&F Concept MD-M4/3 is suitable for: Lens: Minolta MD MC Mount lens(not for Minolta AF mount: KF06.157) Camera: Micro 4/3 (MFT) mount mirrorless camera like Olympus PEN, OM-D series, Panasonic Lumix DMC-G1, G2, G3, G10, GX1, GH1, GH2, GF1, GF2, GF3, GF5, GH4, Panasonic AG-AF100 Mirrorless Digital Cameras, Black Magic Pocket Cinema Camera (BMPCC) 
Q
Which M42 adapter should be used on your lens?
A

Please note: our M42 adapter ring could not be suitable for Pentax Takumar Super Takumar Carl Zeiss M42 series(aperture pin does not fully depress, small tabs sticking out), as ours depresses the aperture pin all the way down

 
Q
Is it able to carry a Fujifilm x-t4 and a 400mm lens?
A
Dear customer, it could support a fujifilm x-t4 and a 400mm lens. and an adapter is needed to use the long and heavy telescope lens. 
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