Am I being stupid? Lens greed I think.

jr_senator wrote in post #3409481
Nope, a 10mm FL is still a 10mm FL regardless of which camera it is on. Same with the 12mm FL.


Actually, 12mm FL on a 1D is 12mm.

woohoo, it's begun.

what are you talking about? 1d series has a 1.3 crop factor, ain't it?
the only full frame is the studio model = 1Ds!
unless i'm missing something about crops...

and the 10m is ef-s only anyway. so it WILL always be 16mm (factoring the 1.6 on a 20d. not sure if the 1d series can take efs lenses)

Oh, blimey! 10mm is 10mm, 12mm is 12mm on any camera. Let's state it most appropriately and without any of this 'crop factor' nonsense...

a 10mm lens on 30D allows it to see 73.7 x 96.7 degrees
a 12mm lens on 1DII allows it to see 77 x 100 degrees
a 16mm lens on 5D allows it to see 73.7 x 96.7 degrees

^^ haha! ok! ok!

but i still say a 10mm pic from a 20d won't be the same as 10m pic from a full frame camera.

and i still say SELL IT!

muscleflex wrote in post #3409730
... i still say a 10mm pic from a 20d won't be the same as 10m pic from a full frame camera.

BUT, I will still be 10mm.

jr_senator wrote in post #3409844
BUT, I will still be 10mm.

you know what he meant. this is how you confuse newcomers because when they look through the viewfinder they can see the difference.

ed rader

ed rader wrote in post #3409854
...you know what he meant. this is how you confuse newcomers...

New comers? He has almost a thousand posts. Sorry, Ed, but confusion thrives where the info is inconsistent and misleading. If you are comfortable with wishy-washy facts, fine, but I think it would be an injustice to new comers not to set the facts right.

lol
ok - ignore my posts for now...
seriously tho - i still don't know what you mean about 10m being 10m on a crop sensor....i'll do a search and see if i can come up with anything.
goodluck with your dilemma!

Another fine example of why I NEVER bought an EF-S lens and will not buy limited lenses in the future either.

Just buy a camera for every lens you have.

The best advice I can give you is find stuff that works for you. That means if you need to thin the herd do so. If its a lens that is so called "not as good" if you like it and get the results you want and need thats all that metters. Knowing your equipment and using things that you are comfortable with and you are getting the results that you like and your clients like, well, thats it bro...

muscleflex wrote in post #3410381
...i still don't know what you mean about 10m being 10m on a crop sensor....

The camera and/or it's format has nothing to do with the focal length of a lens. A 28mm lens will be a 28mm lens regardless of where it is mounted or not mounted. The crop factor was to help those that were used to 35mm film cameras to figure out an equivalent focal length for their smaller format DSLRs. Now, a 10mm lens on a 1.6 crop factor lens has about the same angle of view as a 16mm lens would on a 35mm film (or full frame) camera. I have owned and used formats from Minox and 110, to 126 and 35mm, to 645 and 6cm x 7cm (god, I love that format), to 4" x 5" view camera and many others in between. I never said the 110 format was a 2.0 crop factor, I delt with the format I was using. Being fond of the short tele focal lengths, I understand that on a 110 format this would be a 50mm lens, that on 35mm film format this would be 85-105mm lens and that on my beloved Mamiya RB37 (6cm x 7cm format) it would be 180-210mm. I think it would had been a service to us shutterbugs if the comparisons were made based on AOF instead of FL. If you find this info usefull please send $1 to jr_senator % your local postmaster.

Sell it. Teach Canon to improve the existing EF lenses rather than make new lenses and thus new problems...

jr_senator wrote in post #3410561
I think it would had been a service to us shutterbugs if the comparisons were made based on AOF instead of FL.

Agreed. Unfortunately, the different frame aspect ratios make that somewhat problematic. Instead, one approach is merely to compare the vertical AOV, and ignore the diagonal or horizontal AOV. If you think of every lens in proportion to its vertical frame size, it becomes easy to relate rather than trying to memorize degrees of coverage!

[15mm for APS-C] is like [24mm on FF or 35mm] is like [42mm on 645] is like [55mm on 6x7cm] is like [90mm on 4x5" sheetfilm]

[60mm for APS-C] is like [96mm on FF or 35mm] is like [168mm on 645] is like [220mm on 6x7cm] is like [360mm on 4x5" sheetfilm]

[150mm for APS-C] is like [240mm on FF or 35mm] is like [420mm on 645] is like [550mm on 6x7cm] is like [900mm on 4x5" sheetfilm]

AdamJL wrote in post #3409470
12mm on a 1D is 12mm..

Who wants to start a field of view argument?!

jr_senator wrote in post #3409481
Actually, 12mm FL on a 1D is 12mm.

Let's not go there. You all know my point.