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Forums > Back > new Nikon gear
Scythels
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#25
01-07-2015, 10:17 PM
Think of it logically.  The teleconverter is behind the aperture stop, it cannot alter the aperture stop as seen from the front.  A 300mm f/4 lens requires a 75mm entrance pupil diameter, the teleconverter increases the focal length 40%.  420/75 = 5.6.  Precisely one stop lost.

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Messages In This Thread
new Nikon gear - by Klaus - 01-06-2015, 08:44 AM
new Nikon gear - by Klaus - 01-06-2015, 08:46 AM
new Nikon gear - by popo - 01-06-2015, 10:47 AM
new Nikon gear - by JJ_SO - 01-06-2015, 11:11 AM
new Nikon gear - by Brightcolours - 01-06-2015, 11:21 AM
new Nikon gear - by Brightcolours - 01-06-2015, 11:42 AM
new Nikon gear - by Klaus - 01-06-2015, 12:18 PM
new Nikon gear - by JJ_SO - 01-06-2015, 12:51 PM
new Nikon gear - by stoppingdown - 01-06-2015, 04:45 PM
new Nikon gear - by Scythels - 01-06-2015, 04:46 PM
new Nikon gear - by stoppingdown - 01-06-2015, 07:06 PM
new Nikon gear - by mst - 01-07-2015, 12:08 AM
new Nikon gear - by mst - 01-07-2015, 12:12 AM
new Nikon gear - by Brightcolours - 01-07-2015, 07:06 AM
new Nikon gear - by Brightcolours - 01-07-2015, 07:14 AM
new Nikon gear - by stoppingdown - 01-07-2015, 08:30 AM
new Nikon gear - by felix - 01-07-2015, 08:51 AM
new Nikon gear - by stoppingdown - 01-07-2015, 09:25 AM
new Nikon gear - by mst - 01-07-2015, 12:10 PM
new Nikon gear - by JJ_SO - 01-07-2015, 05:30 PM
new Nikon gear - by Scythels - 01-07-2015, 06:05 PM
new Nikon gear - by JJ_SO - 01-07-2015, 08:54 PM
new Nikon gear - by stoppingdown - 01-07-2015, 09:09 PM
new Nikon gear - by JJ_SO - 01-07-2015, 10:07 PM
new Nikon gear - by Scythels - 01-07-2015, 10:17 PM
new Nikon gear - by JJ_SO - 01-07-2015, 10:30 PM
new Nikon gear - by stoppingdown - 01-07-2015, 10:34 PM
new Nikon gear - by Brightcolours - 01-08-2015, 12:59 AM
new Nikon gear - by Scythels - 01-08-2015, 04:15 AM
new Nikon gear - by JJ_SO - 01-08-2015, 06:43 AM
new Nikon gear - by Brightcolours - 01-08-2015, 08:24 AM
new Nikon gear - by stoppingdown - 01-08-2015, 11:58 AM
new Nikon gear - by Scythels - 01-08-2015, 04:18 PM
new Nikon gear - by JJ_SO - 01-08-2015, 08:40 PM
new Nikon gear - by stoppingdown - 01-08-2015, 08:49 PM
new Nikon gear - by popo - 01-08-2015, 09:30 PM
new Nikon gear - by JJ_SO - 01-08-2015, 09:52 PM
new Nikon gear - by Scythels - 01-08-2015, 10:18 PM
new Nikon gear - by popo - 01-08-2015, 10:31 PM
new Nikon gear - by JJ_SO - 01-09-2015, 09:12 AM
new Nikon gear - by mst - 01-09-2015, 09:43 AM
new Nikon gear - by mst - 01-09-2015, 09:48 AM
new Nikon gear - by Guest - 01-09-2015, 10:19 AM
new Nikon gear - by Brightcolours - 01-09-2015, 01:08 PM
new Nikon gear - by JJ_SO - 01-09-2015, 06:38 PM
new Nikon gear - by stoppingdown - 01-09-2015, 08:42 PM
new Nikon gear - by JJ_SO - 01-09-2015, 09:12 PM
new Nikon gear - by Scythels - 01-09-2015, 09:15 PM
new Nikon gear - by stoppingdown - 01-09-2015, 09:23 PM
new Nikon gear - by JJ_SO - 01-09-2015, 09:39 PM
new Nikon gear - by borisbg - 01-09-2015, 11:34 PM
new Nikon gear - by Klaus - 01-09-2015, 11:43 PM
new Nikon gear - by Scythels - 01-10-2015, 03:29 AM
new Nikon gear - by stoppingdown - 01-10-2015, 01:16 PM
new Nikon gear - by JJ_SO - 01-10-2015, 05:06 PM
new Nikon gear - by stoppingdown - 01-10-2015, 06:10 PM
new Nikon gear - by JJ_SO - 01-10-2015, 07:54 PM
new Nikon gear - by stoppingdown - 01-10-2015, 08:04 PM
new Nikon gear - by JJ_SO - 01-10-2015, 08:36 PM
new Nikon gear - by stoppingdown - 01-10-2015, 09:32 PM
new Nikon gear - by JJ_SO - 01-11-2015, 09:09 AM
new Nikon gear - by Guest - 01-11-2015, 09:12 PM
new Nikon gear - by Klaus - 01-11-2015, 10:16 PM
new Nikon gear - by JJ_SO - 01-12-2015, 01:51 PM
new Nikon gear - by stoppingdown - 01-12-2015, 02:23 PM
new Nikon gear - by stoppingdown - 01-12-2015, 02:33 PM
new Nikon gear - by JJ_SO - 01-12-2015, 03:31 PM
new Nikon gear - by Klaus - 01-12-2015, 08:47 PM
new Nikon gear - by borisbg - 01-13-2015, 06:03 AM
new Nikon gear - by JJ_SO - 01-13-2015, 08:07 AM
new Nikon gear - by Scythels - 01-13-2015, 04:21 PM
new Nikon gear - by JJ_SO - 01-13-2015, 06:38 PM
new Nikon gear - by stoppingdown - 01-13-2015, 08:18 PM
new Nikon gear - by Brightcolours - 01-13-2015, 09:37 PM
new Nikon gear - by Klaus - 01-13-2015, 10:31 PM
new Nikon gear - by JJ_SO - 01-13-2015, 10:48 PM
new Nikon gear - by borisbg - 01-14-2015, 01:24 AM
new Nikon gear - by stoppingdown - 01-14-2015, 10:56 AM
new Nikon gear - by JJ_SO - 01-14-2015, 03:48 PM
new Nikon gear - by mst - 01-15-2015, 09:10 AM
new Nikon gear - by JJ_SO - 01-15-2015, 10:03 AM
new Nikon gear - by stoppingdown - 02-06-2015, 12:09 AM
new Nikon gear - by JJ_SO - 02-06-2015, 05:10 AM
new Nikon gear - by felix - 02-06-2015, 11:25 AM
new Nikon gear - by JJ_SO - 02-06-2015, 02:56 PM
new Nikon gear - by stoppingdown - 02-06-2015, 04:18 PM
new Nikon gear - by JJ_SO - 02-06-2015, 07:52 PM
new Nikon gear - by JJ_SO - 02-10-2015, 11:15 PM
new Nikon gear - by Brightcolours - 02-10-2015, 11:20 PM
new Nikon gear - by JJ_SO - 03-02-2015, 09:28 PM
new Nikon gear - by felix - 03-04-2015, 09:19 AM
new Nikon gear - by stoppingdown - 04-01-2015, 08:09 AM
new Nikon gear - by Brightcolours - 04-01-2015, 09:15 AM
new Nikon gear - by JJ_SO - 04-01-2015, 09:43 AM
new Nikon gear - by felix - 04-01-2015, 07:10 PM
new Nikon gear - by JJ_SO - 04-01-2015, 08:43 PM
new Nikon gear - by popo - 04-01-2015, 11:34 PM
new Nikon gear - by felix - 04-04-2015, 10:39 AM
new Nikon gear - by Brightcolours - 04-04-2015, 12:10 PM
new Nikon gear - by Brightcolours - 04-24-2015, 04:16 PM

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