Missing the X (factor)???

[20dnut]

Just playing around I placed the 20D on a tripod and shot the pellet stove at 35mm with the 18-55 EF-s kit lens. I then switched over to the Tokina 28-80 f/2.8 at 35mm and did the same shot (PSCS metadata confirmed). Where is the x-factor???? I do not see any crop.

I was going to purchase the Canon 10-22, but now I am not so sure. Is it worth the extra $660.00 for 8 mm? I see the 10-22 is 3.5-4.5 and the 18-55 is 3.5-5.6 so the lens is not faster. Is the glass a better quality? Is it that the crop factor is that insignificant at the low end (35mm and below). I am way confused now.

[tim]

Can you please resize your pictures down to a maximum of 800 pixels wide, otherwise provide links to the pictures on another web server.

From what I can see the first shot looks out of focus, and highly compressed.

[20dnut]

I have never posted picture before and am new, I am sorry for the bad post I will try to resize.:o :o

[20dnut]

How do you re-size??

[Belmondo]

The only way you would see the crop would be if you took the same picture from the same place using a camera with a full frame sensor and compared it with the shot taken with your 20D. Then, you would see that the same lens giving you a wider field of vision.

If you took that shot with a 20D, and your EXIF indicates it was shot at 35mm, you're actually getting an effective 56mm. It will be the same with any lens you put on your camera. The reduced field of view gives you an effective magnification of 60%.

[MarkoPolo]

In CS go to image, resize. Set at 180 pixels/inch first, then longest side to 800 pixels. Then hit save for web and fiddle with the controls till you are just under 1K in size. It's easier to do than explain. Hope this helps.

[20dnut]

does that hold true even though one of the lenses was an EF-S?

[Belmondo]

does that hold true even though one of the lenses was an EF-S?

Absolutely.

[LouDawg]

If you take the same picture with two different lenses at 35mm on the same camera, the pictures are going to be the same. I'm not quite sure what you are confused about, but then agian I may be misunderstanding you.

[mbze430]

Try this exercise again with a full frame film camera at the same distance with a 35mm lens setting. You'll see the difference than.

[tim]

I have never posted picture before and am new, I am sorry for the bad post I will try to resize.:o :o

Sorry, I didn't mean to come over bossy or grumpy, I just tend to post in a hurry at work when people are around. Welcome to the site :)

[20dnut]

I guess I thought that the EF-S lens took the 1.6 crop factor into account changing the focal point on the CCD chip and that the image would look diffferent. Now I understand that there is no difference in the image betwen the two lenses, what is missing is what spills over the edge of the CCD on the non EF-s Lens. Is that the sum of it?

[HKFEVER]

The canon seems sharper than the Tokina. Also if you use the same 1.6 sensor, you won't see the different between the 1.6, 1.3 and full frame.

[gcogger]

I guess I thought that the EF-S lens took the 1.6 crop factor into account changing the focal point on the CCD chip and that the image would look diffferent. Now I understand that there is no difference in the image betwen the two lenses, what is missing is what spills over the edge of the CCD on the non EF-s Lens. Is that the sum of it?

Yes :)

[DAMphyne]

HKFEVER: Also if you use the same 1.6 sensor, you won't see the different between the 1.6, 1.3 and full frame.
Can you say that again, only different? I don't understand.

[HKFEVER]

HKFEVER: Also if you use the same 1.6 sensor, you won't see the different between the 1.6, 1.3 and full frame.
Can you say that again, only different? I don't understand.

I used to shoot with film EOS 1V. So I was pretty mad about missing the edges of every picture from my previous 300D (1.6), 1DMKII (1.3). .

I am quite happy the 1DsMKII, because the full frame give back all the edges back to me. So my fisheye is truely a fisheye again.

[Jon]

HKFEVER: Also if you use the same 1.6 sensor, you won't see the different between the 1.6, 1.3 and full frame.
Can you say that again, only different? I don't understand.

If you use your 50 mm lens on three cameras, a 1Ds (24x36 mm, full frame sensor), a 1D (19.1 x 28.7 mm, 1.3x "crop") and a 20D (15 x 22.5 mm, 1.6x "crop"), all at the same point of the same subject, then "cropped" all three down so you were using the central 15 mm x 22.5 mm of the image, you'd see exactly the same picture from all 3. That's why it's called a "crop" factor. It does not change the lens' focal length. There's much more here (http://photography-on-the.net/forum/showthread.php?t=45388). This is a very common misunderstanding.