Is my lens a good or bad copy?

Started 1 month ago | Questions thread
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CH179 New Member • Posts: 20
Is my lens a good or bad copy?

Hi All

I am new to all these lens manufacturing variation stuff

I know that we could not expect a 'perfect' lens and I am ready to accept some variation as long as it is considered 'normal/acceptable' by the community but I am not sure where should i set my expectation

For this case,

I have bought a new deeply discount EFM 22mm lens from a local shop

Got me a resolution chart from the net and printed it out on A4... Fill the frame and took a shot at F2.0(widest aperture).

The result of the 4 corners arranged as what it is

I noticed the top part is generally a little blur compared to the bottom.

So guys, is this lens a bad copy or considered acceptable?

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