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Sigma 105mm f/2.8 Macro DG OS HSM:optimum aperture
#21
Actually, Nikon DSLRs show the effective f-stop of "micro" lenses (even the plasticky 40/2.8), not only the max. available. Good thing for manual flashes, I think. This effect can be watched when focus at infinity, leave the aperture, then focuse at much closer - aperture number goes up. I'm not sure, if it's a full f-stop, but it is significant.

  


Messages In This Thread
Sigma 105mm f/2.8 Macro DG OS HSM:optimum aperture - by Martino Papesso - 10-24-2016, 02:54 PM
Sigma 105mm f/2.8 Macro DG OS HSM:optimum aperture - by Martino Papesso - 10-24-2016, 03:58 PM
Sigma 105mm f/2.8 Macro DG OS HSM:optimum aperture - by davidmanze - 10-25-2016, 05:47 AM
Sigma 105mm f/2.8 Macro DG OS HSM:optimum aperture - by davidmanze - 10-25-2016, 05:56 AM
Sigma 105mm f/2.8 Macro DG OS HSM:optimum aperture - by Martino Papesso - 06-22-2017, 08:31 AM
Sigma 105mm f/2.8 Macro DG OS HSM:optimum aperture - by Martino Papesso - 06-22-2017, 08:34 AM
Sigma 105mm f/2.8 Macro DG OS HSM:optimum aperture - by Martino Papesso - 06-22-2017, 09:20 AM
Sigma 105mm f/2.8 Macro DG OS HSM:optimum aperture - by JJ_SO - 06-22-2017, 10:24 AM

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