18 - 55 Kit lens

[newdamage1]

I need to have someone clear this up, is the Kit Drebel 18-55 lens actually 18-55? or is it 28-88? (1.6x)?

I think its actually 18-55 because of the protruding part that goes into the body, but everyone else here (at work, damn arguemeitive computer nerds :lol: ) says that only to make it not fit on other cameras.

Anyone know the facts?

Kelly

[cloudless]

The kit lens is 18-55 if used on full frame, which it can't. It would be 28-88 if used on 300D/10D. Does that answer your question?

[newdamage1]

Interesting, I wonder why they made the end of this lens protrude into the body of the camera? (I thought this was for making the lens actually a 18-55mm) :(

[Andy_T]

They made it that way so nobody can put it on a film body.

As it was designed as cheap lens for digital bodies only (1.6 crop factor), it would be heavily vignetting on a film body. They don'T want people to try that and complain later.

Best regards,
Andy

[Digital Prophet]

There is a great big thread (http://photography-on-the.net/forum/showthread.php?t=33183&highlight=) (one of several I believe) around this forum on this very topic.

If you read through that I think that you will get more info than you want.

But here is what one fellow wrote that said it pretty good.

Digital Prophet,

I promised myself that I was going to get to bed at a normal hour tonight, but I have been wracking my brain trying to figure out a way to explain this, so here goes:

Let's perform a virtual test - we'll use a 1Ds and a 10D as examples, but instead, we'll use a EOS1V (full frame, same as 1Ds) and an EOS IX (APS film, same frame size as the 10D).

Set up the 1V on a tripod to take a picture of an object, let's say a side view of a car. Set it up with a 50mm lens, so that you get the entire length of the car in the frame. Take the shot.

Now, without moving the tripod, put the EOS IX on it with the same 50mm lens. Take the shot.

Now develop both rolls of film and print contact sheets. We pretty much already know that the EOS1V will yield the whole car, and the EOS IX will give you less because the frame is smaller, just like the 10D compared to the 1Ds. but if you measure the size of the car components in the contact prints, they will be the same size. The door will be the same size in each print, so will the mirror, etc. So the magnification has not changed. That's why it is referred to as a Crop Factor - The smaller format crops out some of the image that would be shown in a full-frame image.

Does that make it any more clear?

My take on the matter is the same, but with numbers:

The sensor on the Digital Rebel is a 22.7mm x 15.1mm sensor while the D70 is 23.7mm x 15.5mm. The difference is minute. But sensor size is important because of what alot of people refer to as the "focal length multiplier". But it means is that a 28mm lens on a 35mm film camera provides a 74 degree field of vision on the film. But the same lens on a Digital Rebel (and very similarly the D70) will provide only a 46 degree field of vision on the digital sensor. That is the equivalent of a 50mm lens. It doesn't mean that you get 50mm worth of closeness from the 28mm lens. But you do get a 50mm worth of view on the sensor because it is smaller than a 35mm film frame.

So there.

- Digital Prophet -

[cmM]

The kit lens is 18-55 if used on full frame, which it can't. It would be 28-88 if used on 300D/10D. Does that answer your question?
You can't use it on a 10D. Uses EF-s mount, and the only camera that supports that is the Rebel.

Ya hear that, MKII owners? You ain't got EF-s !!! My rebel's better :twisted: hahahahahhaa :P

....gotta consolate myself somehow

[cloudless]

You can't use it on a 10D. Uses EF-s mount, and the only camera that supports that is the Rebel.


Actually it could be used on the 10D with some hack/modification... not sure about the detail though.

[cmM]

Actually it could be used on the 10D with some hack/modification... not sure about the detail though.

Yea... and the Rebel has AI Servo, too :wink:


....ummm, with a little hack/modification :P

[EXA1a]

I need to have someone clear this up, is the Kit Drebel 18-55 lens actually 18-55? or is it 28-88? (1.6x)?

I think its actually 18-55 because of the protruding part that goes into the body, but everyone else here (at work, damn arguemeitive computer nerds :lol: ) says that only to make it not fit on other cameras.

Anyone know the facts?

Kelly
Nobody has answered your question so far.

Here we go:
1. "Focal Length" is a physical property of a lens (not only of photographic lenses) and it's completely independent of anything else, including the used camera body.
2. Because many DSLR users come from 35mm SLR photography, they are used to the focal length numbers and they can imagine the field of view it creates on a 35mm body. That's the reason why you find the "equivalent focal length" for DSLRs or even other non-SLR cameras. For people who aren't familiar with 35mm SLR, this is completely useless.
3. Most DSLR cameras have a sensor smaller than 24x36mm (35mm film). That's the reason why the field of view of a lens with certain focal length is smaller that it would be on a full frame 35 mm camera. Camera manufactuers give a "magnification" or "multiplication" factor so that 35mm users can imagine the cropped field of view of a particular focal length.
4. The field of view is the important number for a lens on a specific body. The 18-55mm lens gives you the same field of view as a 29-87mm lens on a full frame body.
5. The EF-S 18-55 has a smaller image circle which would not cover a 35mm film or full frame sensor. Besides that it wouldn't fit. On a 10D it would work but was made to not fit (physical modification possible, but not recommended). On a 1Ds or 1D it would come into the way of the mirror, so even with a modification it would not work and destroy your camera.

--Jens--

[Digital Prophet]

I said that.

You stole my gusto. :shock: Give it back!

- Digital Prophet -

[ron chappel]

EXA1a said it best

The hack to make an EF-s lens fit the 10D/D60?D30 is simply to cut that back section off.That's it.Nothing else needed
Of course there are some better and some worse ways of doing it-one i saw on the web where they filled a part with epoxy before chopping the back off was particularly neat.
By the way-i've tried the 18-55 lens @18mm on a film body (with the mirror locked up!!!) and got this result

http://www.photo.net/photodb/photo?photo_id=2297353&size=lg

Above about the 22mm zoom setting it could be safely used on my EOS 500n body without mirror lockup.
...but that is abit pointless because canon allready have a crap cheap lens that goes from 22-55mm without going to this effort......

[Alexandre Gabriel]

...but that is abit pointless because canon allready have a crap cheap lens that goes from 22-55mm without going to this effort......

Ron, is that true? I was thinking to buy this 22-55mm lens to use with my EOS 30... :(

[ron chappel]

Oops, :oops:
Sorry Alexandre, the 22-55 may be better than the 18-55,i honestly have never tried one.They are in a similar price class though....
I have also never heard glowing reports about it so best to get opinions about that lens from people that have used it