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Tamron 70-300 VC exposure issues
samos1111
Unregistered
 
#30
11-08-2010, 03:35 PM
[quote name='hackmann' timestamp='1288217672' post='3823']

Does your F number change when u try to have a close focus??

[/quote]

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.
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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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