Action Shot!

"Tony B" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

On this morning's spin I was messing around with my phone, taking silly
pictures of myself on the bike. Luckily for me, I neither dropped the
phone or the bike and got home in one piece. I did get quite a nice shot
of my front wheel though:

http://picasaweb.google.com/abramah/Cycling/photo#5061818326758419554

Next time out I'll try and get some rear quarter shots!

bfn,

T

I bought a £10 piece of junk out of tescos and got the follow shots using
nothing more than the pieceof junk and insulating tape

http://www.hyperthenellyphantsports.fotopic.net/c1026505.html

Unfortunately the piece of junk is so poor on HCI that it presents 2
interfaces to windows, 1 that lets you copy the files and 1 that deletes all
files on it and makes it work as a web cam. Its inability to not drain a
battery in 5 seconds means that its only ever used as a web cam now as i can
only get power into it via usb.

The result of hooking the hand chord of a Fuji F11 roudn a space grip and
holding it looknig dead forwards on top of a bar bag can be seen

Niall

Quoted message said:

I did get quite a nice shot
of my front wheel though:

http://picasaweb.google.com/abramah/Cycling/photo#5061818326758419554

I like the bendy spokes. Lets see Jobst explain that one :-)

--
Mark.

This post contains smilies. Smiley SMILEY SMILIES! Not that this'll stop
anyone telling me that they're not /really/ bendy spokes.

Mark Thompson said:

Quoted message said:

I did get quite a nice shot
of my front wheel though:

http://picasaweb.google.com/abramah/Cycling/photo#5061818326758419554

Very nice picture.

Quoted message said:

I like the bendy spokes. Lets see Jobst explain that one :-)

Its due to the speed that the wheel is travelling at (bloody fast).

Despite apparent position of the camera, it is actually about the hight
of the axle. Light from the wheel rim takes longer to reach the camera
than light from the axle. When you take the picture, you are seeing the
centre of the wheel in real time, but the rim of the wheel in past,
approx 1E-9 s ago. In that time the wheel has moved about 1/8 of a turn.

For a 700mm diameter wheel you are moving at (1/8)*3.14*0.7/(1E-9) m/s

It has absolutely nothing to do with camera aliasing, or any other
camera effects. ;-) ;-)

Martin.

Martin Dann wrote on 07/05/2007 22:28 +0100:

Quoted message said:

Mark Thompson said:

Quoted message said:

I did get quite a nice shot of my front wheel though:

http://picasaweb.google.com/abramah/Cycling/photo#5061818326758419554

Very nice picture.

Quoted message said:

I like the bendy spokes. Lets see Jobst explain that one :-)

Its due to the speed that the wheel is travelling at (bloody fast).

Despite apparent position of the camera, it is actually about the hight
of the axle. Light from the wheel rim takes longer to reach the camera
than light from the axle. When you take the picture, you are seeing the
centre of the wheel in real time, but the rim of the wheel in past,
approx 1E-9 s ago. In that time the wheel has moved about 1/8 of a turn.

For a 700mm diameter wheel you are moving at (1/8)*3.14*0.7/(1E-9) m/s

Is that what they mean by "spoke windup"? ;-)

--
Tony

"The most savage controversies are those about matters as to which there
is no good evidence either way."
- Bertrand Russell

in message <[email hidden]>, Mark
Thompson ('pleasegivegenerously@warmmail*_turn_up_the_heat_to_reply*.com'😉

Quoted message said:

Quoted message said:

I did get quite a nice shot
of my front wheel though:

http://picasaweb.google.com/abramah/Cycling/photo#5061818326758419554

I like the bendy spokes. Lets see Jobst explain that one :-)

Taking photos from a moving bike with a cheap digital camera can be fun:

http://www.stewartry-wheelers.org/wheelers/story/article_50.html

--
[email hidden] (Simon Brooke) http://www.jasmine.org.uk/~simon/

-- mens vacua in medio vacuo --