On 7D flash synch speed
No, I meant slower speeds. Slower ambient light speeds, no flash.
That's why the top speed is only 1/4000. The spring tension has been set lower.
Evidentally this is one of the technical hurdles KM had to overcome. If they put the kind of shutter that was in the film version, shutter vibraton at any speed could interfere with AS. Thus, a lower tension spring was used. A by-product or indirect result of this is the slower sync speed.
Geir Ove
wrote:
I gather you meant:
interfere with AS at FASTER shutter speeds.
Then I understand and agree
Geir Ove
JackRiley
wrote:
I think it because KM had to use weaker springs in the shutter
mechanism in order to avoid vibration, vibration that would
interfere with AS at slower shutter speeds.
Geir Ove
wrote:
Hello,
There was a thread covering this subject some time back. I have
been contemplating the subject for a while, and thought I would
share my insights:
The 7D has a synch speed of 1/160 sec if I am not wrong. From the
tables in the Minolta 5600 HS(D) manual, we can read (indirectly)
on page 76 that the max flash duration of the 5600 must be less
than (or equal) to 1/250 sec.
A flash will deliver its power (guide number) through its
brightness and flash duration. For a camera to fully utuilize this
light its shutter speed must NOT be faster than that flash
duration. So for the 7D, we could have had a flash synch speed of
1/250 sec. to fully utilize the power of the 5600.
( The HSS mode allows us to use faster shutter speeds, but at the
cost of reduced guide number. The effective guide number will be
G / Sqrt(S/250) where S the selected shutter speed larger than 250.)
So why doesn't the 7D synch at 1/250 sec? That one I am not sure
of, but I see 2 possibiities:
a) Technical limitations in the cameras design
b) Maybe KM wanted us to be able to utilize Flashes that are slower
than 1/250 sec at their max Guide Number: Studio flashes or 3.
party flashes?
Geir Ove
--
My album at:
http://objective.bitfikler.com/geirove/web/
|
Post
(hide subjects)
|
Posted by
|
When
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 8, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 8, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 7, 2004
|
|
|
|
|
Nov 8, 2004
|
|
|
|
|
Dec 8, 2020
|
|
Keyboard shortcuts:
FForum
PPrevious
NNext
WNext unread
UUpvote
SSubscribe
RReply
QQuote
BBookmark
MMy threads
Color scheme?
Blue /
Yellow
Fujifilm's X-H2 is a high-resolution stills and video camera, that sits alongside the high-speed X-H2S at the pinnacle of the company's range of X-mount APS-C mirrorless cameras. We dug into what it does and what it means.
Holy Stone produces dozens of low-cost drone models aimed at consumers. We look at the HS710 and HS175D to see if they stack up to other sub-250g offerings. Are these secretly great or more like toys?
It's small, light, cheap and extremely wide but is it any good?
After weeks with a production Fujifilm X-T5, Chris and Jordan have some final thoughts.
The EOS R6 II arrives in one of the most competitive parts of the market, facing off against some very capable competition. We think it rises to the challenge.
Above $2500 cameras tend to become increasingly specialized, making it difficult to select a 'best' option. We case our eye over the options costing more than $2500 but less than $4000, to find the best all-rounder.
There are a lot of photo/video cameras that have found a role as B-cameras on professional film productions or even A-cameras for amateur and independent productions. We've combed through the options and selected our two favorite cameras in this class.
What’s the best camera for around $2000? These capable cameras should be solid and well-built, have both the speed and focus to capture fast action and offer professional-level image quality. In this buying guide we’ve rounded up all the current interchangeable lens cameras costing around $2000 and recommended the best.
Family moments are precious and sometimes you want to capture that time spent with loved ones or friends in better quality than your phone can manage. We've selected a group of cameras that are easy to keep with you, and that can adapt to take photos wherever and whenever something memorable happens.
What's the best camera for shooting sports and action? Fast continuous shooting, reliable autofocus and great battery life are just three of the most important factors. In this buying guide we've rounded-up several great cameras for shooting sports and action, and recommended the best.