Attention Tamron 24-70 VC owners

Started Jul 28, 2012 | Discussions thread
Leonard Migliore
Leonard Migliore Forum Pro • Posts: 15,677
What camera do you have?

inasir1971 wrote:

Horshack, thanks for linking to your post - I will repeat the link to your post since you've done the f2.8 tests.

The aperture slack problem is present on mine as well but to a lesser degree.

CHECKING: An easier way to test for this is to switch your camera to 'M' mode and engage liveview. Rotate the aperture dial and look for any changes in the liveview brightness - there should be. If you want to narow down the amount - do it with 1/3 stops, and 1/2 stops and see where it changes.

Using this methodology my copy is off by somewhere between 0.5 to 0.67 stops - so the problem you report is not isolated.

I can't speak about any other Nikon but this method will not work on a D300 because when you change the aperture dial in live view, the lens aperture does not change; it only goes to the newly selected aperture after it does its little mirror dance just before the exposure.

Also, Nikon tries to hold the image brightness in live view, so you won't get an accurate representation of what's going on this way even if you use an AI lens and turn the aperture dial on the lens.

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Leonard Migliore

 Leonard Migliore's gear list:Leonard Migliore's gear list
Canon PowerShot G12 Sony RX100 III Nikon D300 Nikon D750 Nikon AF-S DX Nikkor 16-85mm f/3.5-5.6G ED VR +12 more
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