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Re: [OM] IMG: Two Birds

Subject: Re: [OM] IMG: Two Birds
From: ChrisB <ftog@xxxxxxxxxxxxxx>
Date: Tue, 20 Feb 2018 07:56:58 +0000

Yes, I agree – about the FL.

There are fewer sparrows around in England than 10 years ago, I believe.  It 
might be to do with there being fewer insects, but we encourage them both in 
our garden.


> On 19 Feb 18, at 06:05, Jim Nichols <jhnichols@xxxxxxxxxxxxx> wrote:
> Hi Chris,
> I believe that the focal length is still 500mm, but the field of view is 
> equivalent to that of  a lens of 750mm.  The glass doesn't change, but it 
> sees less because of the cropped sensor.
> We have what I have always heard referred to as an English Sparrow, with 
> fewer stripes and a black throat.  Then our common Sparrow is around, with 
> fewer stripes and a lighter throat.
> Jim Nichols
> Tullahoma, TN USA
> On 2/18/2018 11:43 PM, ChrisB wrote:
>> Presumably, Jim, that’s an effective focal length of around 750mm – with 
>> that sensor.
>> That little bird looks quite similar to the House Sparrow over here.

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