«

A cloudless October day .... perfect for an air show!

http://www.pbase.com/bret/airshow

On 29 Oct 2005 18:52:41 -0700, Annika1980 <> wrote:
> A cloudless October day .... perfect for an air show!
>
> http://www.pbase.com/bret/airshow

Very nice. I offer my humble efforts at something similar, taken at the
Chicago Air&Water show in August:

http://home.uchicago.edu/~dmsilev/heart.jpg
http://home.uchicago.edu/~dmsilev/missing_man.jpg
http://home.uchicago.edu/~dmsilev/Eagle.jpg

Panasonic FZ5. Sadly, the Thunderbirds had to cancel their planned
appearance. On their first show (on Saturday), two of the planes got a
bit too close together, and a missile rail got knocked off one and fell
into the lake. Ergo, no Thunderbirds on Sunday. Plenty of other stuff,
though.

-dms

Annika1980 wrote:
> A cloudless October day .... perfect for an air show!
>
> http://www.pbase.com/bret/airshow
>


Good shots Bret... BTW, what's with the odd 'ringed' appearance of the
exhaust plume of the Starfighter in #51468616 (first image)? Anybody know?

--
jer
email reply - I am not a 'ten'

On Sun, 30 Oct 2005 06:59:25 -0600, Jer <> wrote:

>Annika1980 wrote:
>> A cloudless October day .... perfect for an air show!
>>
>> http://www.pbase.com/bret/airshow
>>
>
>
>Good shots Bret... BTW, what's with the odd 'ringed' appearance of the
>exhaust plume of the Starfighter in #51468616 (first image)? Anybody know?

Shock waves in the afterburner plume. Very normal.
http://www.pratt-whitney.com/presski...f135_3_low.jpg
http://www.tomcattersassociation.org...fterburner.jpg

--
Bill Funk
Replace "g" with "a"
funktionality.blogspot.com

Annika1980 wrote:

> A cloudless October day .... perfect for an air show!
>
> http://www.pbase.com/bret/airshow

Nice, but I noticed something here:

Canon EOS 20D ,Canon EF 70-200mm f/2.8L USM
1/640s f/5.0 at 280.0mm iso400 full exif

How can you get the focal length to 280 mm on a 70-200mm. Has a 2x convert
been used here?

--
Jørn Dahl-Stamnes
http://www.dahl-stamnes.net/dahls/

Jørn Dahl-Stamnes <> writes:

> Annika1980 wrote:
>
>> A cloudless October day .... perfect for an air show!
>>
>> http://www.pbase.com/bret/airshow
>
> Nice, but I noticed something here:
>
> Canon EOS 20D ,Canon EF 70-200mm f/2.8L USM
> 1/640s f/5.0 at 280.0mm iso400 full exif
>
> How can you get the focal length to 280 mm on a 70-200mm. Has a 2x convert
> been used here?

More likely a 1.4x converter.

--
Måns Rullgård

On Sun, 30 Oct 2005 21:14:11 +0100, Jørn Dahl-Stamnes
<> wrote:

>Annika1980 wrote:
>
>> A cloudless October day .... perfect for an air show!
>>
>> http://www.pbase.com/bret/airshow
>
>Nice, but I noticed something here:
>
> Canon EOS 20D ,Canon EF 70-200mm f/2.8L USM
> 1/640s f/5.0 at 280.0mm iso400 full exif
>
>How can you get the focal length to 280 mm on a 70-200mm. Has a 2x convert
>been used here?
>
It is probably a calculated focal length.
the 20D has a 1.6X factor sensor (APS size), so the reported focal
length would be multiplied by 1.6 to get the 280mm.

--
Bill Funk
Replace "g" with "a"
funktionality.blogspot.com

Bill Funk wrote:

> It is probably a calculated focal length.
> the 20D has a 1.6X factor sensor (APS size), so the reported focal
> length would be multiplied by 1.6 to get the 280mm.

I'm not sure that's it. My Nikon 70-200 will read 140-400mm with the 2x
converter installed. The only difference is that it will read f/5.6 instead
of f/2.8.






Rita

On 10/30/05 4:07 PM, in article , "Rita Ä
Berkowitz" <ritaberk2O04 @aol.com> wrote:

> Bill Funk wrote:
>
>> It is probably a calculated focal length.
>> the 20D has a 1.6X factor sensor (APS size), so the reported focal
>> length would be multiplied by 1.6 to get the 280mm.
>
> I'm not sure that's it. My Nikon 70-200 will read 140-400mm with the 2x
> converter installed. The only difference is that it will read f/5.6 instead
> of f/2.8.
>
>
>
2X = 2 stops


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Bill Funk <> wrote:
> Jørn Dahl-Stamnes
>>Annika1980 wrote:

>>> A cloudless October day .... perfect for an air show!
>>>
>>> http://www.pbase.com/bret/airshow
>>
>>Nice, but I noticed something here:
>>
>> Canon EOS 20D ,Canon EF 70-200mm f/2.8L USM
>> 1/640s f/5.0 at 280.0mm iso400 full exif
>>
>>How can you get the focal length to 280 mm on a 70-200mm. Has a 2x convert
>>been used here?
>>
>It is probably a calculated focal length.
>the 20D has a 1.6X factor sensor (APS size), so the reported focal
>length would be multiplied by 1.6 to get the 280mm.

Except that 200 times 1.6 is 320. It's obviously the 1.4x
teleconverter that was used with the lens. Besides, I've got
the Digital Rebel with the same crop factor and it doesn't do
any such calculation when reporting the focal length.

--
Ray Fischer