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Can u, for want of a better explanation, MODe in Unix and Unix-like environments.">chmod a cf card so it becomes write only.

I know under windows u can make a folder read only, but I want to make it writeable but not deletable.

Reason is at an old photo club we used to do photo rallies, give everyone a set of directions with places/things to photograph and a roll of film, they had 24/36 things to take and one shot to do it. Then you have a judging night and award points on each set of the same thing. Winner is the person who got the most points.

I’d like to arrange one for a new club, but half the people use digital which makes it easy to just shoot until you get a photo you are happy with. Not really fair for the film people.

What I’d like to know is if there is a dos command or software to change the permissions on a folder to do what I want, and if the camera will take notice of those permissions.

Hmm... not too sure.

I'd imagine you could with firmware, but not too sure otherwise.

You could just get small cards, say a 128mb, and check the time stamps.

on my pentax even if you delete an image the file number is still there so you will skip a number.
I can change the file number by adding an image to a card with a different file number then the camera starts counting from there but i have to do that with a computer and it would be a hard [though not impossible ] thing to do while out.

if you handed out a card big enough to take the amount of images needed and took it back straight after the time period [or get a few people to start and stop at the same time from the same location to keep an eye on each other] you should be right.

just get them to take an image of the sky [ help when looking for dust bunnies] and record the number of the first image then count from there.

Simon,

I'd expect it can't be done with modes. mode of a file. There are three modes a file can have turned on or off: read ability, write ability, and execute ability. Each mode can be set for either the owner, the members of the owner's group, or all users.">mode of a file. There are three modes a file can have turned on or off: read ability, write ability, and execute ability. Each mode can be set for either the owner, the members of the owner's group, or all users.">CHMOD is an abbreviation for CHange MODe.">CHMOD or any file security structure as the camera has to support the security settings you set on the card.

I don't know of ( and can't see any reason ) Nikon / Canon supporting security on the CF cards as there isn't a need for it. If there was any security the firmware of the camera would have to support this structure.

I'd expect the best way to go is take a contol image ( say a picture of your face ) at the start of the excercise as that will give you an image and file number. Then another control image at the end of the day to show the end file number.

Warwick, Nikon do support card security on the D2X but only in the manner that the card will only work with that camera. It is called LockTight. They brought it out with Lexar.

http://www.dpreview.com/news/0502/05021 ... ightcf.asp

Simon,

No. The filesystem is fat32, and that doesn't permit such things.

Most cameras permit you to protect the images on the card, but I don['t think there's a way to prevent a user from overriding that in some way.

Unfortunately, most (all?) digital cameras use the FAT "filesystem" with flash cards, which has no concept of ownerships or permissions.

Cheers
Steffen.

Most cameras store the shutter count in the Exif Data though right ?
So can't you use it, or the sequential number of the file names to keep track of it ? (just a thought).

http://www.sandisk.com/Products/Catalog(1025)-SanDisk_Shoot_and_Store_CompactFlash.aspx

Single use cards? Haven't seen them here though.

Alpha_7 wrote:Most cameras store the shutter count in the Exif Data though right ?
So can't you use it, or the sequential number of the file names to keep track of it ? (just a thought).

i think the only canon cameras that store this sort of information in the file are the 1 series cameras which sort of limits the use of this method.

how serious is the competition? would an honesty policy not work?

bloop wrote:http://www.sandisk.com/Products/Catalog(1025)-SanDisk_Shoot_and_Store_CompactFlash.aspx

Single use cards? Haven't seen them here though.

I don't think they are single use, merely marketing to capture the recently converted from film market.

pippin88 wrote:

bloop wrote:http://www.sandisk.com/Products/Catalog(1025)-SanDisk_Shoot_and_Store_CompactFlash.aspx

Single use cards? Haven't seen them here though.

I don't think they are single use, merely marketing to capture the recently converted from film market.

yeah, probably a good marketing idea to get rid of a backlog of smaller cards that serious digital photographers wont touch.

Alpha_7 wrote:Most cameras store the shutter count in the Exif Data though right ?
So can't you use it, or the sequential number of the file names to keep track of it ? (just a thought).

yeah, i think this is probably the easiest way.

got a lot of great suggestions, thanks ppl.