Tamron 45 mm 1.8 VCD underexposing on D850

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DigitalFFUser Senior Member • Posts: 1,021
Tamron 45 mm 1.8 VCD underexposing on D850
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Tamron 45 mm 1.8 VCD with D850 always underexposes (with iso 64 and Flash in TTL mode) .. to overcome this I dial in 0.3 to 0.7 exposure compensation. Nikon lenses 35 mm 1.8G and %0 mm 1.8 G doesn't have this issue.

Any idea why this is happening? Does Tamron lens transfer lesser light to sensor or is it the issue with communication protocol that Tamron has reverse engineered?

I am expecting TTL Flash to compensate for the lack of light as I am using manual exposure mode.

Same combination is working fine with Nikon primes of similar focal lengths.

I compared Nikon and Tamron lenses with same exposure settings in same area and lighting.

 DigitalFFUser's gear list:DigitalFFUser's gear list
Nikon D610 Nikon D850 Nikon 85mm F1.8G Tamron SP 70-200mm F/2.8 Di VC USD Tamron SP 45mm F1.8 Di VC USD +8 more
Nikon D850
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