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Re: [OM] [OT] Why?

Subject: Re: [OM] [OT] Why?
From: "Jim Nichols" <jhnichols@xxxxxxxxxxxxx>
Date: Tue, 17 Aug 2010 18:41:10 -0500
I had the same thought, but you expressed it with much more finesse!

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Tuesday, August 17, 2010 6:23 PM
Subject: Re: [OM] [OT] Why?


> Probably taken with a kit lens that was wide open at f/4.9 at 78mm.  It 
> appears to me that the shot was taken in heavy shade.  If the ISO is 
> overspecified it's probably only by one stop.  The shot was taken at 
> 1/250.  At ISO 800 it could have been at 1/125 which is about as low as 
> you'd want to go on a small sensor camera at 78mm.
> 
> Do you recall the old 35mm rule of thumb that to counteract camera shake 
> you shouldn't use a shutter speed slower than the reciprocal of the 
> focal length?  For small sensor cameras you need to modify that rule by 
> the crop factor.  For Canon that's 1.6 which would yield 1/78x1.6 = 
> 1/124.8.  Can't get much closer to 1/125 than that.  And, of course, 
> that's the minimum.  To guarantee a sharp image the photog should use a 
> faster speed... like 1/250 which is what was done here.  Of course, the 
> lens might have had IS... but probably not.
> 
> It's a pretty small image so it's hard to tell but it does look pretty 
> good for ISO 1600 on an APS-C size sensor.
> 
> Chuck Norcutt
> 
> 
> Willie Wonka wrote:
>> Why would one choose to use ISO 1600 for this particular shot:
>> 
>> http://www.bikeexif.com/honda-cb750-2
>> 
>> Best
>> 
>> Boris
>> 
>> 
>> 
>>       
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