A question about Canon 10-20 & 17-40...

Sadlybrokeboy

Sadlybrokeboy

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Hi everyone!

I normally hate these sort of threads, but I'm dithering and could do with some other points of view! :bonk::bang::cuckoo:

I'm in the fortunate position of already having a 17-40L and have now been given "permission" for 'er indoors to get a Canon EFs 10-22 to go on the end of my 40D too! :) :eek:


I do alot of landscape work when time allows, which is why I'm lusting after one.....

Now the question is this - they're both allegedly "ultra wide" lenses - but will I actually notice the difference that extra 7mm will give me? Or will it be a waste?


Any opinions appreciated! :)

Matt
 
there's a massive difference. the 17-40 is only really an ultra wide lens on a FF camera. Which is about the same as a 10-22 on a crop camera - if you see my meaning.

With the 1.6x crop, the 17-40 is a 27.2mm-64mm equivalent..... not really ultra wide is it?

The 10-22 will be a 16-35.2 equiv...... that is Ultra Wide.....
 
The 17-40L is only an ultra wide lens on a full frame camera where you get the full 17mm at the short end. On a 1.6X crop sensor 17mm equates to 27.2mm focal length, so is only considered moderately wide these days, although in the 35mmm film days 24mm was considered very wide, and anything much shorter than that was thought of as a bit specialised, which shows how times have changed.

The 10-20mm lens and others like it have been developed to address the decrease in field of view with wide lenses on crop sensor cameras. The 10 -20mm on your 40D would give you an actual 16mm focal length (at the short end) which is very wide by any standards so you certainly wouldn't be wasting your time as there are vast differences between the two lenses, and IMO one doesn't replace the other.
 
OK - yep I see the point now - I'd forgotten about the 1.6 Crop!!

Am off to go sit in a corner - someone got a D hat for me? :cuckoo::cuckoo:

Oh anyone here used Onestop Digital before? They OK?

Thanks for clearing that up guys!! :D

Matt
 
There's a massive, massive difference between 10mm and 17mm. Heck, there's a massive difference between 10mm and 12mm. Get the 10-22. You'll love it.
 
Used onestop before on two occasions with no problems.

On a side note, I use the 17-40 and 10-22 and it is a good combo which works well in a variety of situations, go for it ;)
 
Like the other posts....you will notice a hell of a difference.

Ever thought about the Sigma 10-20?

With a good one the image is as good as the 17-40L
 
one way of thinking about it:
does 7mm make a difference? (17-10 = 7)

another way:
does 41% make a difference? (7/17 = 41%)

just a thought! :thinking:
 
Sadlybrokeboy said:
OK - yep I see the point now - I'd forgotten about the 1.6 Crop!!

Am off to go sit in a corner - someone got a D hat for me? :cuckoo::cuckoo:

Oh anyone here used Onestop Digital before? They OK?

Thanks for clearing that up guys!! :D

Matt
Click to expand...

One stop are ok but might be an idea to speak to Ian Kerr before you go dropping cash to them. Ian is a guy who deals on a number of forums and on ebay. Most of my stuff was bought through him.

kerso1123@msn.com

He lives inthe USA and imports to Scotland (he sorts the duty) then the item is posted from Scotland to the buyer. Overall process is very quick and prices are VERY competitive. These are not grey imports like HK sites and he'll provide a UK receipt which you can use for cash back (if available at that time).

Certainly worth contacting him.

Jim
 
dcash29 said:
Ever thought about the Sigma 10-20?

With a good one the image is as good as the 17-40L
Click to expand...

dcash - I think that's my concern with the Sigma one - the "with a good one" bit - I've heard that there are good copies and bad copies out there - which kinda put me off a bit....

And mmcp42 - you think of 7mm and it doesn't sound like much a difference...but when you put it in as a percentage then yes you're right! :)

Thanks guys - always appreciated! :D

Matt
 
I think what Chewy means is because it's EFs - it won't be affected by the crop factor i.e. 10mm will actually be 10mm not 16mm....but I think it'll still be affected by it!
 
Sadlybrokeboy said:
I think what Chewy means is because it's EFs - it won't be affected by the crop factor i.e. 10mm will actually be 10mm not 16mm....but I think it'll still be affected by it!
Click to expand...

absolutely correct!:clap:
 
Thought so - but it does beg the question - what's the point of EFs lenses?

:thinking::exit:
 
As I understood it, EF-S is simply a mount designation, and doesn't affect the crop factor. 10mm is 10mm, as Stewart says, but with a crop camera, the smaller sensor and hence frame size means that it's equivalent to 16mm on a full frame.
 
Sadlybrokeboy said:
Thought so - but it does beg the question - what's the point of EFs lenses?

:thinking::exit:
Click to expand...
The point of EF-S lenses is that they are physically smaller, and therefore cheaper, than EF lenses. And by being physically smaller it makes it possible for them to offer shorter focal lengths. An EF 10-22mm lens would be an enormous beast, if it were possible at all.

I think it's time to wheel out my old graphic again. On the left is a simulation of the view through an EF lens. On the right is a simulation of the view through an EF-S lens with the same focal length.

Get it now?

Crop-factor-demo-3.jpg
 
Sadlybrokeboy said:
Thought so - but it does beg the question - what's the point of EFs lenses?

:thinking::exit:
Click to expand...


The point of EF-S lenses is that they've been developed to give a wider field of view on crop sensor cameras. They achieve this by the the rear of the lens intruding further into the camera body If you fitted an EF-S lens on an incompatible camera (Canon 1 Series for example ) there's a very real danger of the rear of the lens fouling the mirror and damage ensuing.

As has been said above the crop factor still applies so 10mm becomes an effective 16mm.

The only thing to guard against in collecting too many EF-S lenses is that if you should at some stage upgrade to a 1 Series body they wouldn't fit, so you really need to think about what your long term requirements might possibly be when building up your glass collection.
 
Sorry - been rushed off my feet all afternoon, so didn't get a chance to reply to this!

StewartR - Thank you, the graphic illustrates the differences perfectly - make more sense now :)

Thanks everyone for your comments - they have helped immeasurably! :)

Matt
 
Matt.
Ive only heard of one bad unit out of many, and that was changed instore for a good one.

If i was looking for a 10-20 i wouldnt hesitate in which one to buy

Ive shot with a sigma 10-20 against my 17-40L and i cant fault it.

By the way my 17-40L had to go back to Canon for element realignment in its warranty period.

Dave
 
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