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Forums > Back > Tamron 70-300 VC exposure issues
hackmann
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#31
11-08-2010, 11:00 PM
[quote name='_sem_' timestamp='1289230559' post='4051']

Certainly it does, but that's effective aperture, it decreases at close-focus normally ("bellows factor"). The nominal aperture (physical hole) is probably the same throughout the range. Can't tell for sure due to the lenses between my eyes and the aperture diaphragm, but the aperture blades surely do move at least approximately as expected at both focus ends.

[/quote]



Yeah, i am aware about this. I have a sigma 150mm macro that behaves this way.



I asked this because I also read somewhere about firmware bugs in some lenses related to effective and nominal aperture, not only with canon but with nikon too.



Does that happens in any aperture?



Sorry mate, I do not have enough knowledge to help you.
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Messages In This Thread
Tamron 70-300 VC exposure issues - by mst - 09-16-2010, 08:01 AM
Tamron 70-300 VC exposure issues - by Klaus - 09-16-2010, 08:11 AM
Tamron 70-300 VC exposure issues - by mst - 09-16-2010, 08:20 AM
Tamron 70-300 VC exposure issues - by wim - 09-16-2010, 09:05 AM
Tamron 70-300 VC exposure issues - by mst - 09-16-2010, 09:12 AM
Tamron 70-300 VC exposure issues - by joachim - 09-16-2010, 03:14 PM
Tamron 70-300 VC exposure issues - by mst - 09-16-2010, 03:33 PM
Tamron 70-300 VC exposure issues - by Bare - 09-16-2010, 06:49 PM
Tamron 70-300 VC exposure issues - by Klaus - 09-16-2010, 07:53 PM
Tamron 70-300 VC exposure issues - by koulang - 09-17-2010, 04:35 AM
Tamron 70-300 VC exposure issues - by Bare - 09-17-2010, 10:33 AM
Tamron 70-300 VC exposure issues - by sth - 09-21-2010, 10:57 PM
Tamron 70-300 VC exposure issues - by Steinar1 - 09-23-2010, 02:15 PM
Tamron 70-300 VC exposure issues - by Steinar1 - 09-24-2010, 10:58 AM
Tamron 70-300 VC exposure issues - by Guest - 09-26-2010, 06:31 AM
Tamron 70-300 VC exposure issues - by Steinar1 - 09-27-2010, 02:20 PM
Tamron 70-300 VC exposure issues - by william9 - 10-06-2010, 04:41 PM
Tamron 70-300 VC exposure issues - by mst - 10-19-2010, 10:43 AM
Tamron 70-300 VC exposure issues - by mst - 10-19-2010, 10:46 AM
Tamron 70-300 VC exposure issues - by samos1111 - 10-25-2010, 08:24 AM
Tamron 70-300 VC exposure issues - by hackmann - 10-27-2010, 12:47 PM
Tamron 70-300 VC exposure issues - by mst - 10-27-2010, 01:25 PM
Tamron 70-300 VC exposure issues - by mst - 10-27-2010, 01:30 PM
Tamron 70-300 VC exposure issues - by wim - 10-27-2010, 01:44 PM
Tamron 70-300 VC exposure issues - by wim - 10-27-2010, 01:46 PM
Tamron 70-300 VC exposure issues - by mst - 10-27-2010, 02:03 PM
Tamron 70-300 VC exposure issues - by hackmann - 10-27-2010, 10:14 PM
Tamron 70-300 VC exposure issues - by samos1111 - 11-08-2010, 03:19 PM
Tamron 70-300 VC exposure issues - by samos1111 - 11-08-2010, 03:35 PM
Tamron 70-300 VC exposure issues - by hackmann - 11-08-2010, 11:00 PM
Tamron 70-300 VC exposure issues - by mst - 11-10-2010, 10:52 PM
Tamron 70-300 VC exposure issues - by samos1111 - 11-12-2010, 01:26 PM
Tamron 70-300 VC exposure issues - by samos1111 - 11-12-2010, 01:48 PM
Tamron 70-300 VC exposure issues - by wim - 11-13-2010, 02:03 AM
Tamron 70-300 VC exposure issues - by mst - 11-13-2010, 12:12 PM
Tamron 70-300 VC exposure issues - by mannypr - 11-17-2010, 09:36 PM
Tamron 70-300 VC exposure issues - by mst - 11-18-2010, 10:26 AM
Tamron 70-300 VC exposure issues - by mannypr - 11-19-2010, 01:07 AM
Tamron 70-300 VC exposure issues - by mst - 11-19-2010, 08:16 AM
Tamron 70-300 VC exposure issues - by Guest - 11-19-2010, 10:21 AM
Tamron 70-300 VC exposure issues - by mst - 11-19-2010, 11:49 AM
Tamron 70-300 VC exposure issues - by mannypr - 11-19-2010, 05:30 PM
Tamron 70-300 VC exposure issues - by mst - 11-19-2010, 06:18 PM
Tamron 70-300 VC exposure issues - by grahamnp - 11-20-2010, 05:42 AM
Tamron 70-300 VC exposure issues - by lugui - 11-27-2010, 07:47 AM
Tamron 70-300 VC exposure issues - by woodsfortysix - 11-27-2010, 04:16 PM
Tamron 70-300 VC exposure issues - by woodsfortysix - 11-28-2010, 12:30 AM
Tamron 70-300 VC exposure issues - by vincent_photo - 12-17-2010, 04:46 PM
Tamron 70-300 VC exposure issues - by opiecat - 12-18-2010, 08:09 PM
Tamron 70-300 VC exposure issues - by vincent_photo - 12-19-2010, 02:59 PM
Tamron 70-300 VC exposure issues - by Steinar1 - 12-20-2010, 06:03 PM
Tamron 70-300 VC exposure issues - by Klaus - 02-06-2011, 01:09 PM
Tamron 70-300 VC exposure issues - by sth - 02-06-2011, 04:42 PM
Tamron 70-300 VC exposure issues - by Klaus - 02-07-2011, 09:13 AM
Tamron 70-300 VC exposure issues - by koulang - 02-08-2011, 06:59 AM
Tamron 70-300 VC exposure issues - by Klaus - 02-08-2011, 07:21 AM
Tamron 70-300 VC exposure issues - by miro - 02-08-2011, 08:59 AM
Tamron 70-300 VC exposure issues - by mst - 02-08-2011, 09:31 AM
Tamron 70-300 VC exposure issues - by IanCD - 02-08-2011, 10:47 PM
Tamron 70-300 VC exposure issues - by IanCD - 02-08-2011, 11:03 PM
Tamron 70-300 VC exposure issues - by Klaus - 02-09-2011, 10:39 AM
Tamron 70-300 VC exposure issues - by mst - 02-09-2011, 10:56 AM
Tamron 70-300 VC exposure issues - by mst - 02-09-2011, 11:26 AM
Tamron 70-300 VC exposure issues - by IanCD - 02-09-2011, 06:32 PM
Tamron 70-300 VC exposure issues - by samos1111 - 02-16-2011, 09:51 AM
Tamron 70-300 VC exposure issues - by janjhoi - 02-26-2011, 04:16 AM
Tamron 70-300 VC exposure issues - by miro - 02-05-2011, 02:42 PM

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