Angle of view instead of focal length

On 14/10/2012 10:50 AM, rwalker wrote:
On Wed, 3 Oct 2012 04:31:45 -0700 (PDT), Whisky-dave
wrote:

That's the culture, I used to think of film speeds in ISO terms as I borought CT18 & CT21 film from agfa.

For years even in the UK our focal lenghs were in mm but before 1971 ???????

Why in the USA do you use mm when everythig else is imperial ?
I'd have thought a 'standard' lens in the US would have a focal lenght of 2 inches NOT 50mmm ;-)


Because we don't use imperial for everything. We use an odd mix.
Perscription drugs, soft drinks, wine and liquour are all sold in
metric units. Lenses are measured in mm. Distances are miles,
weights for most things are in lbs. and ounces, but again for
perscription drugs and other materials, weights are metric. Nuts and
bolts are as likely to be measured in mm. as in inches. Automobile
engine displacement in all modern engines are measured in liters.


And you sell petrol in real gallons. and not imperial gallons.

On Sun, 14 Oct 2012 16:00:26 +1100, Rob wrote:

On 14/10/2012 10:50 AM, rwalker wrote:
On Wed, 3 Oct 2012 04:31:45 -0700 (PDT), Whisky-dave
wrote:

That's the culture, I used to think of film speeds in ISO terms as I borought CT18 & CT21 film from agfa.

For years even in the UK our focal lenghs were in mm but before 1971 ???????

Why in the USA do you use mm when everythig else is imperial ?
I'd have thought a 'standard' lens in the US would have a focal lenght of 2 inches NOT 50mmm ;-)


Because we don't use imperial for everything. We use an odd mix.
Perscription drugs, soft drinks, wine and liquour are all sold in
metric units. Lenses are measured in mm. Distances are miles,
weights for most things are in lbs. and ounces, but again for
perscription drugs and other materials, weights are metric. Nuts and
bolts are as likely to be measured in mm. as in inches. Automobile
engine displacement in all modern engines are measured in liters.


And you sell petrol in real gallons. and not imperial gallons.

Right.
And milk is sold by the quart, but wine by the liter. Go figure.

On 2012-10-14 00:25:19 -0700, rwalker said:

On Sun, 14 Oct 2012 16:00:26 +1100, Rob wrote:

On 14/10/2012 10:50 AM, rwalker wrote:
On Wed, 3 Oct 2012 04:31:45 -0700 (PDT), Whisky-dave
wrote:

That's the culture, I used to think of film speeds in ISO terms as I
borought CT18 & CT21 film from agfa.

For years even in the UK our focal lenghs were in mm but before 1971 ???????

Why in the USA do you use mm when everythig else is imperial ?
I'd have thought a 'standard' lens in the US would have a focal lenght
of 2 inches NOT 50mmm ;-)


Because we don't use imperial for everything. We use an odd mix.
Perscription drugs, soft drinks, wine and liquour are all sold in
metric units. Lenses are measured in mm. Distances are miles,
weights for most things are in lbs. and ounces, but again for
perscription drugs and other materials, weights are metric. Nuts and
bolts are as likely to be measured in mm. as in inches. Automobile
engine displacement in all modern engines are measured in liters.


And you sell petrol in real gallons. and not imperial gallons.

Right.
And milk is sold by the quart, but wine by the liter. Go figure.

....and then there are the 1 & 2 liter bottles of soda.

--
Regards,

Savageduck

On Sun, 14 Oct 2012 16:00:26 +1100, Rob wrote:

On 14/10/2012 10:50 AM, rwalker wrote:
On Wed, 3 Oct 2012 04:31:45 -0700 (PDT), Whisky-dave
wrote:

That's the culture, I used to think of film speeds in ISO terms as I borought CT18 & CT21 film from agfa.

For years even in the UK our focal lenghs were in mm but before 1971 ???????

Why in the USA do you use mm when everythig else is imperial ?
I'd have thought a 'standard' lens in the US would have a focal lenght of 2 inches NOT 50mmm ;-)


Because we don't use imperial for everything. We use an odd mix.
Perscription drugs, soft drinks, wine and liquour are all sold in
metric units. Lenses are measured in mm. Distances are miles,
weights for most things are in lbs. and ounces, but again for
perscription drugs and other materials, weights are metric. Nuts and
bolts are as likely to be measured in mm. as in inches. Automobile
engine displacement in all modern engines are measured in liters.


And you sell petrol in real gallons. and not imperial gallons.

I have a number of containers calibrated in real gallons. For some
reason I'm always short-changed when I buy from someone who uses US
gallons.
--

Regards,

Eric Stevens

On 14/10/2012 7:02 PM, Eric Stevens wrote:
On Sun, 14 Oct 2012 16:00:26 +1100, Rob wrote:

On 14/10/2012 10:50 AM, rwalker wrote:
On Wed, 3 Oct 2012 04:31:45 -0700 (PDT), Whisky-dave
wrote:

That's the culture, I used to think of film speeds in ISO terms as I borought CT18 & CT21 film from agfa.

For years even in the UK our focal lenghs were in mm but before 1971 ???????

Why in the USA do you use mm when everythig else is imperial ?
I'd have thought a 'standard' lens in the US would have a focal lenght of 2 inches NOT 50mmm ;-)


Because we don't use imperial for everything. We use an odd mix.
Perscription drugs, soft drinks, wine and liquour are all sold in
metric units. Lenses are measured in mm. Distances are miles,
weights for most things are in lbs. and ounces, but again for
perscription drugs and other materials, weights are metric. Nuts and
bolts are as likely to be measured in mm. as in inches. Automobile
engine displacement in all modern engines are measured in liters.


And you sell petrol in real gallons. and not imperial gallons.

I have a number of containers calibrated in real gallons. For some
reason I'm always short-changed when I buy from someone who uses US
gallons.



Correct but they did change the size of the gallon because they could
not reduce the tax. that was after the English invaded the US.

On Sun, 14 Oct 2012 22:34:45 +1100, Rob wrote:

On 14/10/2012 7:02 PM, Eric Stevens wrote:
On Sun, 14 Oct 2012 16:00:26 +1100, Rob wrote:

On 14/10/2012 10:50 AM, rwalker wrote:
On Wed, 3 Oct 2012 04:31:45 -0700 (PDT), Whisky-dave
wrote:

That's the culture, I used to think of film speeds in ISO terms as I borought CT18 & CT21 film from agfa.

For years even in the UK our focal lenghs were in mm but before 1971 ???????

Why in the USA do you use mm when everythig else is imperial ?
I'd have thought a 'standard' lens in the US would have a focal lenght of 2 inches NOT 50mmm ;-)


Because we don't use imperial for everything. We use an odd mix.
Perscription drugs, soft drinks, wine and liquour are all sold in
metric units. Lenses are measured in mm. Distances are miles,
weights for most things are in lbs. and ounces, but again for
perscription drugs and other materials, weights are metric. Nuts and
bolts are as likely to be measured in mm. as in inches. Automobile
engine displacement in all modern engines are measured in liters.


And you sell petrol in real gallons. and not imperial gallons.

I have a number of containers calibrated in real gallons. For some
reason I'm always short-changed when I buy from someone who uses US
gallons.



Correct but they did change the size of the gallon because they could
not reduce the tax. that was after the English invaded the US.

I think there was an element of rationalisation. An Imperial gallon of
fresh water weighs 10 lbs which makes 1 Imperial pint weigh 1.25 lbs.
A US gallon weighs 8 lbs which makes 1 US pint weigh 1 lb.
--

Regards,

Eric Stevens

On 2012-10-14 12:57:51 -0700, Eric Stevens said:

On Sun, 14 Oct 2012 22:34:45 +1100, Rob wrote:

On 14/10/2012 7:02 PM, Eric Stevens wrote:
On Sun, 14 Oct 2012 16:00:26 +1100, Rob wrote:

On 14/10/2012 10:50 AM, rwalker wrote:
On Wed, 3 Oct 2012 04:31:45 -0700 (PDT), Whisky-dave
wrote:

That's the culture, I used to think of film speeds in ISO terms as I
borought CT18 & CT21 film from agfa.

For years even in the UK our focal lenghs were in mm but before 1971 ???????

Why in the USA do you use mm when everythig else is imperial ?
I'd have thought a 'standard' lens in the US would have a focal lenght
of 2 inches NOT 50mmm ;-)


Because we don't use imperial for everything. We use an odd mix.
Perscription drugs, soft drinks, wine and liquour are all sold in
metric units. Lenses are measured in mm. Distances are miles,
weights for most things are in lbs. and ounces, but again for
perscription drugs and other materials, weights are metric. Nuts and
bolts are as likely to be measured in mm. as in inches. Automobile
engine displacement in all modern engines are measured in liters.


And you sell petrol in real gallons. and not imperial gallons.

I have a number of containers calibrated in real gallons. For some
reason I'm always short-changed when I buy from someone who uses US
gallons.



Correct but they did change the size of the gallon because they could
not reduce the tax. that was after the English invaded the US.

I think there was an element of rationalisation. An Imperial gallon of
fresh water weighs 10 lbs which makes 1 Imperial pint weigh 1.25 lbs.
A US gallon weighs 8 lbs which makes 1 US pint weigh 1 lb.

Not if you use fluid ounces. 16 fluid ounces = 1 US pint; 1 US Gallon =
128 fluid ounces, and 1 Imp. Gallon = 153.72159 fluid ounces.

--
Regards,

Savageduck

On 2012.10.14 15:57 , Eric Stevens wrote:

A US gallon weighs 8 lbs which makes 1 US pint weigh 1 lb.

All very nice - but inaccurate.

See http://www.unc.edu/~rowlett/units/dictG.html

http://www.unc.edu/~rowlett/units/ being one of the most useful web
pages for units - current and historical/obscure.

--
"There were, unfortunately, no great principles on which parties
were divided – politics became a mere struggle for office."
-Sir John A. Macdonald

On 10/14/2012 4:10 PM, Savageduck wrote:
On 2012-10-14 12:57:51 -0700, Eric Stevens said:

On Sun, 14 Oct 2012 22:34:45 +1100, Rob wrote:

On 14/10/2012 7:02 PM, Eric Stevens wrote:
On Sun, 14 Oct 2012 16:00:26 +1100, Rob wrote:

On 14/10/2012 10:50 AM, rwalker wrote:
On Wed, 3 Oct 2012 04:31:45 -0700 (PDT), Whisky-dave
wrote:

That's the culture, I used to think of film speeds in ISO terms
as I borought CT18 & CT21 film from agfa.

For years even in the UK our focal lenghs were in mm but before
1971 ???????

Why in the USA do you use mm when everythig else is imperial ?
I'd have thought a 'standard' lens in the US would have a focal
lenght of 2 inches NOT 50mmm ;-)


Because we don't use imperial for everything. We use an odd mix.
Perscription drugs, soft drinks, wine and liquour are all sold in
metric units. Lenses are measured in mm. Distances are miles,
weights for most things are in lbs. and ounces, but again for
perscription drugs and other materials, weights are metric. Nuts and
bolts are as likely to be measured in mm. as in inches. Automobile
engine displacement in all modern engines are measured in liters.


And you sell petrol in real gallons. and not imperial gallons.

I have a number of containers calibrated in real gallons. For some
reason I'm always short-changed when I buy from someone who uses US
gallons.



Correct but they did change the size of the gallon because they could
not reduce the tax. that was after the English invaded the US.

I think there was an element of rationalisation. An Imperial gallon of
fresh water weighs 10 lbs which makes 1 Imperial pint weigh 1.25 lbs.
A US gallon weighs 8 lbs which makes 1 US pint weigh 1 lb.

Not if you use fluid ounces. 16 fluid ounces = 1 US pint; 1 US Gallon =
128 fluid ounces, and 1 Imp. Gallon = 153.72159 fluid ounces.

Surely, that's obfuscation since fluid ounces are defined differently.
One fluid ounce (US) is 29.5737 cubic centimeters
One fluid ounce (British) is 28.4130 cc
Eight pints make a gallon in both US and British measure but a pint (US)
is 16 fluid ounces (US) and a British pint is 20 fl. oz (British)

Thus we have 1 US gallon is 3,785.4336 cc and 1 British gallon is
4,546.08 cc.
--
Jim Silverton (Potomac, MD)

Extraneous "not" in Reply To.

On 10/14/2012 4:51 PM, James Silverton wrote:
On 10/14/2012 4:10 PM, Savageduck wrote:
On 2012-10-14 12:57:51 -0700, Eric Stevens said:

On Sun, 14 Oct 2012 22:34:45 +1100, Rob wrote:

On 14/10/2012 7:02 PM, Eric Stevens wrote:
On Sun, 14 Oct 2012 16:00:26 +1100, Rob wrote:

On 14/10/2012 10:50 AM, rwalker wrote:
On Wed, 3 Oct 2012 04:31:45 -0700 (PDT), Whisky-dave
wrote:

That's the culture, I used to think of film speeds in ISO terms
as I borought CT18 & CT21 film from agfa.

For years even in the UK our focal lenghs were in mm but before
1971 ???????

Why in the USA do you use mm when everythig else is imperial ?
I'd have thought a 'standard' lens in the US would have a focal
lenght of 2 inches NOT 50mmm ;-)


Because we don't use imperial for everything. We use an odd mix.
Perscription drugs, soft drinks, wine and liquour are all sold in
metric units. Lenses are measured in mm. Distances are miles,
weights for most things are in lbs. and ounces, but again for
perscription drugs and other materials, weights are metric. Nuts
and
bolts are as likely to be measured in mm. as in inches. Automobile
engine displacement in all modern engines are measured in liters.


And you sell petrol in real gallons. and not imperial gallons.

I have a number of containers calibrated in real gallons. For some
reason I'm always short-changed when I buy from someone who uses US
gallons.



Correct but they did change the size of the gallon because they could
not reduce the tax. that was after the English invaded the US.

I think there was an element of rationalisation. An Imperial gallon of
fresh water weighs 10 lbs which makes 1 Imperial pint weigh 1.25 lbs.
A US gallon weighs 8 lbs which makes 1 US pint weigh 1 lb.

Not if you use fluid ounces. 16 fluid ounces = 1 US pint; 1 US Gallon =
128 fluid ounces, and 1 Imp. Gallon = 153.72159 fluid ounces.

Surely, that's obfuscation since fluid ounces are defined differently.
One fluid ounce (US) is 29.5737 cubic centimeters
One fluid ounce (British) is 28.4130 cc
Eight pints make a gallon in both US and British measure but a pint (US)
is 16 fluid ounces (US) and a British pint is 20 fl. oz (British)

Thus we have 1 US gallon is 3,785.4336 cc and 1 British gallon is
4,546.08 cc.
Can I just add a very important statistic, a standard beer bottle (12
oz) contains 354.88 cc in the US and the British are cheated at 340.96
cc, tho' for a pint of beer (unusual in the US), Americans get 473.18 cc
and British get 568.26 cc.

--
Jim Silverton (Potomac, MD)

Extraneous "not" in Reply To.