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Understanding differences between Canon S2 & EOS
Hi guys. I finally decided on Canon to Nikon, but what a disappointment!.

I currently own the Powershot S2 IS and the EOS 450d. I would have thought that these 2 cameras are not even comparable. Please help me carify a few things..

The S2 has (5.75 x 4.31 mm) 0.24 cm sensor and a lens of approx. 35mm (diameter). The EOS has a (22.2 x 14.8 mm) 3.28 cm sensor and a slightly bigger lense (18-55 IS)..

The bigger sensor on the EOS means you need more light, for the same fstop. F5.6 on the S2 is bringing in more light (compared to sensor size) than the same setting on the EOS which means you can use a quicker shutter on the S2 than the EOS thus getting less shake and better picture..

Also the mirror has to flip out of the way and the shutter must be bigger all contributing to more vibrations..

Is this correct? Or did I have a faulty camera?.

Thanks..

Comments (16)

Ciancu wrote:.

Hi guys. I finally decided on Canon to Nikon, but what a disappointment!I currently own the Powershot S2 IS and the EOS 450d. I would havethought that these 2 cameras are not even comparable. Please help mecarify a few things..

They are not .

The S2 has (5.75 x 4.31 mm) 0.24 cm sensor and a lens of approx.35mm (diameter)..

The diameter thing is irrelevant.The EOS has a (22.2 x 14.8 mm) 3.28 cm sensor and a.

Slightly bigger lense (18-55 IS)..

Bigger?.

The bigger sensor on the EOS means you need more light, for the samefstop..

No. f stop has nothing to do with sensor size..

In fact, if you consider that larger sensor has less noise, you need LESS light in order to get the same noise characteristics..

F5.6 on the S2 is bringing in more light (compared to sensorsize) than the same setting on the EOS.

No, it brings EXACTLY the same amount of light per sensor surface unit..

Which means you can use aquicker shutter on the S2 than the EOS thus getting less shake andbetter picture..

Well, that's wrong on more than one level..

Also the mirror has to flip out of the way.

Correct..

And the shutter must bebigger all contributing to more vibrations..

I don't really know the S2, but I suppose it uses an electronic shutter. BTW, shutter does not significantly contribute to vibrations, mirror does. And that's only in a quite tight set of shutter speed values..

Is this correct? Or did I have a faulty camera?.

How should we know if you have a faulty camera? If you will post images and/or complain about a specific thing, we'll try to help. Until then, I suggest reading at least the exposure part in the Learn/Glossary section of DPReview. Might clear up some issues..

Thanks..

Comment #1

Well I took several test pictures and the S2 were always clearer. I set both cameras to auto and took a picture of a fan from the side focusing on a particular nut.The S2 shows much more details and is more in focus..

Is there anywhere I can upload these test images?.

Thanks..

Comment #2

Ciancu wrote:.

Well I took several test pictures and the S2 were always clearer. Iset both cameras to auto and took a picture of a fan from the sidefocusing on a particular nut.The S2 shows much more details and is more in focus..

Is there anywhere I can upload these test images?.

Thanks.

Was this indoors? Shutter speed? ISO setting?.

There are various image hosts on the internet. Flickr, imageshack, etc...

Comment #3

1- Learn about depth of field and how it's affected by aperture..

2- Learn about post-processing in particular, sharpening and be aware that SLRs normally default to far less aggressive in-camera processing than non-SLR digital cameras..

3- If you're going to rely on auto mode, research it and figure out how it works, because it's based on somebody else's assumptions not yours...

Comment #4

Of course that there is more in focus on a small sensor camera. Learn about DOF. The control over DOF is one of the advantages of a larger sensor camera over a camera with a small one.VictorBucuresti, Romaniahttp://s106.photobucket.com/albums/m268/victor_petcu/http://picasaweb.google.com/teodor.nitica/..

Comment #5

Thanks theatrus.

Shot was taken Indoors, shutter speed and iso on pics.

Http://www.flickr.com/photos/28660287@N04/?saved=1..

Comment #6

1- Learn about depth of field and how it's affected by aperture.>.

I know a bit about depth of field but I'm focusing on a 10mm nut approx 5 feet away. It should be in focus..

2- Learn about post-processing in particular, sharpening and be aware that SLRs normally default to far less aggressive in-camera processing than non-SLR digital cameras.>.

Thanks but I'd expect the DSLR to give me a better pic reducing time consuming post-processing..

3- If you're going to rely on auto mode, research it and figure out how it works, because it's based on somebody else's assumptions not yours.>.

I never said I was going to rely on auto I just set it up for one shot...

Comment #7

Of course that there is more in focus on a small sensor camera. Learn about DOF. The control over DOF is one of the advantages of a larger sensor camera over a camera with a small one.>.

Where did I mention that there is more in focus on one than the other. I know about DOF and blurring the backgroud, but I expect what I focused on to be crystal clear. In this case there is no big difference..

Http://www.flickr.com/photos/28660287@N04/?saved=1..

Comment #8

Because you didn't focused properly.Here are some examples:.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

You have a lot of focus points on 450D. You cannot master them in automatic mode use the center focus point and then reframe..

These are for action shots. And use the Single not Continuous Focus mode. Your subject is still so the continuous AF will make more errors than expected.VictorBucuresti, Romaniahttp://s106.photobucket.com/albums/m268/victor_petcu/http://picasaweb.google.com/teodor.nitica/..

Comment #9

Ciancu wrote:.

Thanks theatrus.

Shot was taken Indoors, shutter speed and iso on pics.

Http://www.flickr.com/photos/28660287@N04/?saved=1.

Unfortunately, you haven't have included the EXIF info..

I'll comment the bag on the bed images..

Your S2 image is clear front to back. The EOS one has a thin layer of sharpness in the front and is out of focus to the back. This is the depth of field difference you were told about..

Now, I can't tell why the camera has not focused on the bag. It might be possible that all focus points were selected and the camera focused on the closest thing to it. You may as well have a case of front focus. Hard to tell..

To test for that, tape a newspaper on the wall and shot it perpendicularily. Preferable using a tripod. If it's not clear AND it's not user error, google for and download the "nikon focus test chart". It includes instructions how to use it..

I am not sure, you should check the Canon documentation, but I believe that for prosumers acceptable focus is considered within 2/3 of DOF..

Also, make sure you understand how focus points work before doing the tests..

I still can't tell you if you have a problem with the camera or not. If I were to guess, I'd blame it on user error, but one can't be sure..

Good luck.

/d/n..

Comment #10

Ciancu wrote:.

2- Learn about post-processing in particular, sharpening and be aware that SLRs normally default to far less aggressive in-camera processing than non-SLR digital cameras.>.

Thanks but I'd expect the DSLR to give me a better pic reducing timeconsuming post-processing..

If that is your expectation, then you have made an error. It is the simpler point and shoot cameras that are specifically designed to produce snappy results without further processing..

However, you can still adjust your camera to produce more lively results straight off, if that is what you want..

To do so, go into the menus and set the defaults to increase saturation (+2?) increase sharpness (+2?) and maybe also increase contrast a little (+1 or +2?). Bear in mind that making these changes may make your camera more sensitive to slight errors of exposure, so you may need to "bracket" shots more often....

..... (bracketing is shooting a lighter frame and a darker frame, along with exposure that the meter thinks is correct)Regards,Baz..

Comment #11

Thanks for your help, I did as you suggested, set focus to the middle point made sure I'm using the single focusing mode not the servo but images are still not very clear..

I had a look at the lense in the sun and it looks like that there is something on the inside of the lense. You can't see it indoors but out in the sun you can..

Just out of curiosity, do these cameras come with the battery charged? Because this one came with 2/3 charge in it..

Thanks again...

Comment #12

Mine look charged but after about 100 shots died. I usually get more than 600 shots per charge.VictorBucuresti, Romaniahttp://s106.photobucket.com/albums/m268/victor_petcu/http://picasaweb.google.com/teodor.nitica/..

Comment #13

Only necessary to post once. Why was the original message posted twice in the same forum with different subjects?..

Comment #14

Because I wanted to change the subject but could not find how to...

Comment #15

Took the camera to Canon agent, they tried it there and still could not get a decent photo. They replaced the lens but no improvement, so it was the camera after all...

Comment #16

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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