help needed re 30D

Question from a friend, I dont get what she is talking about.
this is for you,or any canon 30d owners...
does the 30d have the option to change the size ratio? My pana has the options of 3:4 or 3:2 etc....I don't remember the rest...but my shots from the canon are coming into the computer at a ratio that is not standard and so I am running into problems with standard sizes....plus the crop factor complicates further....does this makes sense to anybody?

no...as far as i know, the sensor's ratio (3:2) is what you will get as an output file, whether RAW or JPG.

not that I know of

No - the aspect ratio is determined by the physical sensor size. If you want to change this, it must be done by cropping in post-production, in Photoshop, for instance.

Thanks guys will pass the info on

3:2 is a standard size for 35mm film. Sizes such as 10x8 or 7x5 actually crop film enlargements.

I tend to print in the correct ratio most of the time, thus sizes like:

7.5x5
12x8
15x10
30x20

Photobox.co.uk do all the 3:2 sizes.

aladyforty wrote in post #3886277
but my shots from the canon are coming into the computer at a ratio that is not standard and so I am running into problems with standard sizes....plus the crop factor complicates further....does this makes sense to anybody?

The crop factor has no bearing on this what so ever, the ratio remains the same

3:2 is the standard 35mm film ratio, since DSLR's are simply an evolution of the 35mm SLR they have all retained the same 3:2 ratio as a standard.

Computers traditionally use a 4:3 ratio (before wide screen monitors became popular) and you will find that the vast majority of PC applications work best on a 4:3 ratio.
The vast majority of Compact Digital cameras also use a 4:3 ratio, I can only assume it is because the very first ones shot at such low resolution the images were only really suitable for viewing in a digital environment, and so looked best at the 4:3 ratio.
This ratio has since been inherited by modern high mega pixel compacts.
Some compacts offer in camera cropping to different ratios, usually 3:2 (for traditional 35mm film print sizes) and 16:9 for those who like to look at their photos on wide screen TVs (also handy for landscapes).


Of course there is nothing stopping you shooting the pictures with some room around the edges so you can crop them to what ever ratio you like.

One day of course some smart camera manufacturer will wake up to the fact that a digital sensor can be what ever shape they want it to me, and start making 1:1 ratio DSLR's. Then we can crop to what ever size, shape and ratio we like

thanks again I think this will help

Moppie wrote in post #3886955
3:2 is the standard 35mm film ratio, since DSLR's are simply an evolution of the 35mm SLR they have all retained the same 3:2 ratio as a standard.

well, not all of them


http://www.sigmaphoto.​com/news/news.asp?nID=​3291

One day of course some smart camera manufacturer will wake up to the fact that a digital sensor can be what ever shape they want it to me, and start making 1:1 ratio DSLR's. Then we can crop to what ever size, shape and ratio we like

I was just thinking that myself the other night!

dekalbSTEEL wrote in post #3888051
well, not all of them


http://www.sigmaphoto.​com/news/news.asp?nID=​3291

A good point, they instead have gone down the digital compact route, useing a ratio to match most computers

It was one of the first discussions I ever read when I joined the forum, I think it was CDS who suggested it.
I'm surprised none of the manufacturers have tried it.

Moppie wrote in post #3886955
One day of course some smart camera manufacturer will wake up to the fact that a digital sensor can be what ever shape they want it to me, and start making 1:1 ratio DSLR's. Then we can crop to what ever size, shape and ratio we like

Except of course, the lens projects a circular image - a lot of the width of which would be gone if they cropped square.

Phil V wrote in post #3889700
Except of course, the lens projects a circular image - a lot of the width of which would be gone if they cropped square.

No different to the current 3:2 format, where the top and bottom are cropped

I think the biggest problem would come from the fact that many current EOS's lenses do not project a circular image.
They often have a set of blinds that projects an image roughly the same rise and shape as the sensor: i.e. a 3:2 ratio rectangle.

It's best demonstrated by putting a Sigma DC lens on a full frame camera (I know there is a photo somewhere taken with a 10-22 on a film body).

So the camera manufacturers could either build a square sensor that only uses part of the projected image circle (effectively a square crop sensor) or develop a whole new lens mount and series of lenses, or we can shoot with our 3:2 ratio cameras and crop them square

All the lens I have ever look at project a round image. It is the camera that crops off the rest of the light.

Easy enough to tell. Take a bare lens out in the sunlight and put a piece of paper at the focal plane. Is the projected image round or oval?

Dunno, but my money is on round. I've got a couple of EF-S lenses, maybe I'll have a look...

-js