TC14EIII and TC20EIII - image quality wide open

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mpe Regular Member • Posts: 457
TC14EIII and TC20EIII - image quality wide open

I am getting mixed results with my TC20EIII and TC14EIII.

When used wide open on my 200mm f/2 I can see significant drop when used wide open. The image is hazy and there is lack of contrast. When stopping down by half-full stop it improves significantly.

I don't like the IQ wide open which contradicts to test reports which generally state no or minimal loss of IQ on fast lens. If using TC I can also see a great deal of purple fringing when shooting birds against contrast sky.

I just wondered if anyone uses converters wide open on fast aperture lens and is happy.

Samples attached (hope they will make it through DPR uploader intact)

200mm f/2 +TC14EIII @ 280mm effective (f/3.5 left, f/2.8 right)

200mm f/2 +TC20EIII @ 400mm effective (f/4.0 left, f/5.6 right)

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