Sony 21mm Ultra-Wide Conversion Lens for FE 28mm f/2 Lens

Although, for some, this converter will never give them the performance they expect from a dedicated prime lens, so long as you're aware of its few weaknesses and use it accordingly, it can yield excellent quality images.

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  Good build quality, Excellent sharpness when stopped down, Focusing seem unaffected by the converter, Automatically detected by the camera/lens, Not too expensive, Low distortion

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  Sharpness at maximum aperture, CA at maximum aperture, No, thread

I've used my 21mm Ultra-Wide Conversion Lens for a week now and just finished using it for Autumn landscapes this weekend with great results. I'm seeing that there is little to no IQ degradation in using it, and also find that it is much easier to remove this lens from the end of my 28mm FE f/2 than...

Works like a charm

This does a very nice job for a conversion lens. Price is nice and quality is quite good. Even gives correctEXIF data. For not a lot of extra size you get a 28 and a 21mm lens

Works great. Decent wide open but gets better as you stop it down. I mainly used it on my a7sii for wide shots on a gimbal. The fact that i have essentially a 21mm auto focus lens made it worth it.

Everything I hope they would be and more. fits nicely on the 28mm.

28mm is wide enough most of the time, and I keep considering the possibility of a lens around 15mm, but when I need just a little more than 28mm, the 21mm wide-angle adapter fills the gap.