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+--- Thread: Teardown of the Canon RF 70-200mm f/2.8 IS (/showthread.php?tid=4592)
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RE: Teardown of the Canon RF 70-200mm f/2.8 IS - Brightcolours - 01-09-2020
Firmware update for the RF 70-200mm f2.8 L IS USM, for the issue mentioned in above posts:
Firmware Version 1.0.6 incorporates the following fix:
・Fixed a phenomenon when performing AF shooting to capture a subject at close-range with the focus distance approximately set to the Tele-end (200mm), the image may become slightly front-focused.
This firmware update is for lenses equipped with firmware versions 1.0.5 or earlier. If the lens's firmware is already version 1.0.6, it is not necessary to update the firmware.
https://www.canon-europe.com/support/consumer_products/products/cameras/rf-lenses/rf70-200mm_f28_l_is_usm.html?type=firmware&firmwaredetailid=tcm:13-1931120&os=os%20x%2010.9%20%28mavericks%29&language=en
RE: Teardown of the Canon RF 70-200mm f/2.8 IS - thxbb12 - 01-09-2020
Ahahah, I love it when manufacturers use the wording "phenomenon" to avoid saying what it really is: a bug in their firmware code.
As if it were some strange thing that decided to manifest itself for some mysterious reason
RE: Teardown of the Canon RF 70-200mm f/2.8 IS - walter_g - 01-09-2020
Please check here: https://en.wikipedia.org/wiki/Phenomenon (see paragraph "Science")
... there is nothing mysterious ;-)
RE: Teardown of the Canon RF 70-200mm f/2.8 IS - Brightcolours - 01-09-2020
Or just check a dictionary...
phenomenon |fɪˈnɒmɪnən| noun (pl. phenomena |-nə| )
1 a fact or situation that is observed to exist or happen, especially one whose cause or explanation is in question: glaciers are interesting natural phenomena.
2 Philosophy the object of a person's perception.
3 a remarkable person or thing. the band was a pop phenomenon just for their sales figures alone.
ORIGIN late 16th cent.: via late Latin from Greek phainomenon ‘thing appearing to view’, based on phainein ‘to show’.
usage: The word phenomenon comes from Greek, and its plural form is phenomena, as in these phenomena are not fully understood. It is a mistake to treat phenomena as if it were a singular form, as in this is a strange phenomena.
RE: Teardown of the Canon RF 70-200mm f/2.8 IS - Klaus - 01-09-2020
I can't argue regarding focus accuracy yet, but the AF is extremely fast ;-)