JimH Loc: Western South Jersey, USA

True. The APS-C vs 'Full Frame' comparison is only valid as a size comparison, not necessarily a quality comparison. For many people, the current 'crop' of bodies is perfectly adequate for snapping little Susy in the sandbox and the occasional butterfly.

Swamp Gator Loc: Coastal South Carolina

Actually your basic $69 point n' shoot (any brand) is likely adequate for those things.

Gary Truchelut Loc: Coldspring, TX

The answer to the question of shooting action with a full sensor camera is yes you can and with great results. The difference is the number of frames per second the camera is capable of processing. As far as I know, and I don't claim to know about all models or makes but in the Canon line the choice for wildlife and action is the smaller sensor camera. The 7D and the 1D mark IV can fire off more images per second than any of the full frame cameras currently available and at the 16-18megapixel range. This is most important in action photography.
As far as the sensor size, this is not as much of a factor as you can crop the image of the full frame camera and achieve the same cropped image as the C sized sensor gives you. Where the full frame excels is in making full use of the wide angle lens
you have for landscape as well as portraiture where you can use more digital information to work with.

pdwoodswood Loc: Lewisville, NC

Likely 90% is 18-105mm and most of that at 24-70mm.
Hence I am looking at the L lens with my current Xsi body and anticipate body upgrade under $1900.00 in near future.I think the L in 24-105 will be my choice. So which Canon offers full frame at least $$?

wrei

The short answer to your question is:
The difference in quality between a picture shot with a "full format sensor" compares the same way to the quality of a picture shot with a "reduced format sensor" as the picture qualities between a 24x36 mm negative versus a 6 x 6 medium format or a large format cameras.

Gary Truchelut Loc: Coldspring, TX

Canon 5D is lowest priced full size sensor camera in Canon line.

LarryD Loc: Mojave Desert

If you want new, Canon only offers 2 full frame cameras. The 5dII, and the 1DsIII.

The 5dII at $2,500.00, and the 1DsIII at $8,000.00

Used can be found a bit cheaper, or older models...

nikondaddy Loc: Mayfield,Kentucky

Full frame is max digital and unless your computer can keep up and your customers keep ordering I will take 4x6,s with that ,could be over kill like a monster truck to run over a cock roach to kill it. If you good and your clients are forking over top dollar and you have to give them nothingt but the best for those $10,000 dollar weddings then you need 24 megs and full frame and the best glass that Canon produces. All else is vanity and if you got the money go for it.

pdwoodswood Loc: Lewisville, NC

Thanks much, I shoot quiet a bit with 100mm macro and 18-55mm. maybe the 5D is affordable.
Correct me if this is wrong priority, I plan to purchase L glass before the 5D. Are lenses interchangeable with Xsi, 7D, 5D?
This is a fantastic forum. I don't have a clue where else to tap this kind of resource.
Thanks to all who participate

Rufus Loc: Puget Sound area, WA

Remember that perspective is determined by, and only by, the position of the camera, not by focal length. Experiment: keep camera in one spot and check images at widely different fl's. Image with long fl will be smaller but relative size of objects and angles between them are unchanged.

pdwoodswood Loc: Lewisville, NC

To others who reply note question on interchangeability of L glass between Xsi, 7D and 5D.
Thanks

beacher Loc: Butler, PA

Firstly, your Rebel and the 7D or 60D all share the same size CMOS sensor; so the quality of any single picture you take will pretty much depend on your lense selection and your own abilities :-D ! Now, if your price line is around 1400 bucks, or less, your selections will be limited to APS-C size sensors if you only consider new; but you can expand your selection if you can consider refurbished or used cameras. You may find a canon 1ds mk1 for around a grand or so. What you really need to do is think about what you are looking for in a camera. Then you can concern yourself with sensor size if that becomes important. If speed is a concern, a 7D can take pics faster than any full frame in your price range. Want to take videos and stills, 7D or 60D fits the bill. Inclement weather, 1Ds (refurb) or 7D (if not too bad of conditions). You need to cruise dpreview.com or other such sites to understand the pros and cons of the various cameras you are considering. As you can see from the responses to your simple :roll: question, there is much to consider. Hope this helps.

Bigdaver

I don't think any answer actually hit what is different in a full frame.
You lose depth of field with a full frame (for out of focus backgrounds in a portrait say) so they achieve a look with fast glass not possible with a crop sensor.
Also for a given pixel count, noise is lower/dynamic range (mostly shadows) is higher because of larger photosite size.

JimH Loc: Western South Jersey, USA

Yes, all "L" lenses will fit any of those three bodies.