Crop factor question

I normally shoot my 5D MKII and for a back up I have a T2I. I want to buy a nice wide angle lens, but hear that some may have an issue on a FF camera. I was thinking about a
16-35mm on the 5D.Would it be ok to use one on the T2I and drop down to a 10-22 because of the 1.6 crop on it?

Anything to shed some light on this would be appreciated. Meaning how the crop factor works on a wide angle camera. Is a FF better????

Hollywoodgt wrote in post #13917985
I normally shoot my 5D MKII and for a back up I have a T2I. I want to buy a nice wide angle lens, ...

For which body? No lens will offer the same recorded field of view on different formats.

Very nice lens, and it will work very well as a short standard zoom on APS-C.

Yup - you'd need to get something like that to match the FoV you'd have with the 5D/16-35 combination. The 16-35 won't 'magically' become a 10-22 of course.

Neither format really offers any fundamental advantage for wide angle work, it's just that the focal lengths used will be different. In practical terms, I'm not sure if there is something available for APS-C that could match the 14L on FF.

Hollywoodgt wrote in post #13917985
I normally shoot my 5D MKII and for a back up I have a T2I. I want to buy a nice wide angle lens, but hear that some may have an issue on a FF camera. I was thinking about a
16-35mm on the 5D.Would it be ok to use one on the T2I and drop down to a 10-22 because of the 1.6 crop on it?

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Anything to shed some light on this would be appreciated. Meaning how the crop factor works on a wide angle camera. Is a FF better????

Yup, the 10 will equal a 16mm

So considering that the 10-22mm might not be a bad choice. Figuring that a 10-22mm becomes a 16-35mm on the T2I, which is still a decent wide angle? And really wide on the 5D II

I did look at some sample pic's of the 14mm 2.8L and there were some creative images. Gee guess this is how these boards were invented...every one trading chit out

Hollywoodgt wrote in post #13918083
So considering that the 10-22mm might not be a bad choice. Figuring that a 10-22mm becomes a 16-35mm on the T2I, which is still a decent wide angle? And really wide on the 5D II

I did look at some sample pic's of the 14mm 2.8L and there were some creative images. Gee guess this is how these boards were invented...every one trading chit out

the 10-22mmwon't fit on the 5D...it's made just for crop cameras...i think you had it right the first time in getting a 16-35mm....gives you an UWA on the 5D where you'd primarily use it i think...and then would still be a good(although short) walk around on your t2i...

if you want something that is wide on the t2i, and then really wide on the 5D look at a sigma 12-24mm...

Hollywoodgt wrote in post #13918083
So considering that the 10-22mm might not be a bad choice. Figuring that a 10-22mm becomes a 16-35mm on the T2I, which is still a decent wide angle? And really wide on the 5D II

Well, no, it doesn't become a 16-35. I'm hoping that this is just a bit of loose terminology that you are using, but from what you've written in a couple of places here, I'm still a bit concerned that you think lenses change focal length based on the format of the camera on which they are mounted. They do not.

Hollywoodgt wrote in post #13917985
I normally shoot my 5D MKII and for a back up I have a T2I.

There's your problem. It isn't really a backup if it has a significantly different sensor size.

melcat wrote in post #13918310
There's your problem. It isn't really a backup if it has a significantly different sensor size.

Expand on that if you will please. I understand the differnce in cameras, but was wondering if I was missing something. The T2I has produced some great images.

As far as the crop factor at 1.6 yes I do understand....was loose terminolgy. I did not realize though that the 10-22 wouldn't fit and I will check into the other option.

Thank you so much for everyones in put

If you intend to share a single physical lens between the two cameras, then you MUST buy an EF mount lens, as an EF-S mount lens will not mount correctly on the 5D.

So, for Canon WA/UWA EF lenses, you have these options below. I have provided the equivalent crop FOV focal lengths in brackets, for when placed on the crop camera.

8-15L fisheye (13-24)
16-35L (26 - 56)
17-40L (27 - 64)
24-70L (38 - 112)
24-70LII (38 - 112)
24-105L (38 - 168)
14L (22)
15 fisheye (24)
20 (32)
24L (38)
24 (38)

Of course, the lens does not change when mounted on the crop camera, but the field of view that results from that lens will be 1.6 times narrower than the same lens on the full format camera, so the camera's FOV effectively looks like the longer FL lens equivalent shown in brackets.

So, you can see that all of the 24mm lenses, when mounted on the crop camera, provide a FOV equivalent to a 38mm lens on full format, which is really not very wide at all.

I'd suggest that you use dedicated WA lenses for each body, as they really don't overlap very well at the WA end of the range. What this (practically speaking) means is...use an EF lens on the ff camera, and an EF-S lens on the crop camera.

The advantage of this is...you have backup for camera AND lens issues.

A 17-40L or 16-35L or 24L on the full frame and....
A 10-22 EF-S lens or Tokina 11-16 Mkii on the crop camera would work very well, IMO.

Old Baldy wrote in post #13919793
If you intend to share a single physical lens between the two cameras, then you MUST buy an EF mount lens, as an EF-S mount lens will not mount correctly on the 5D.

So, for Canon WA/UWA EF lenses, you have these options below. I have provided the equivalent crop FOV focal lengths in brackets, for when placed on the crop camera.

8-15L fisheye (13-24)
16-35L (26 - 56)
17-40L (27 - 64)
24-70L (38 - 112)
24-70LII (38 - 112)
24-105L (38 - 168)
14L (22)
15 fisheye (24)
20 (32)
24L (38)
24 (38)

Of course, the lens does not change when mounted on the crop camera, but the field of view that results from that lens will be 1.6 times narrower than the same lens on the full format camera, so the camera's FOV effectively looks like the longer FL lens equivalent shown in brackets.

So, you can see that all of the 24mm lenses, when mounted on the crop camera, provide a FOV equivalent to a 38mm lens on full format, which is really not very wide at all.

I'd suggest that you use dedicated WA lenses for each body, as they really don't overlap very well at the WA end of the range. What this (practically speaking) means is...use an EF lens on the ff camera, and an EF-S lens on the crop camera.

The advantage of this is...you have backup for camera AND lens issues.

A 17-40L or 16-35L or 24L on the full frame and....
A 10-22 EF-S lens or Tokina 11-16 Mkii on the crop camera would work very well, IMO.

Thank you very much for the response. That was great !!!!

Hollywoodgt wrote in post #13918083
So considering that the 10-22mm might not be a bad choice. Figuring that a 10-22mm becomes a 16-35mm on the T2I, which is still a decent wide angle? And really wide on the 5D II

I did look at some sample pic's of the 14mm 2.8L and there were some creative images. Gee guess this is how these boards were invented...every one trading chit out

The 10-22 doesn't "become" a 16-35 on the T2i.... It's always a 10-22... the focal length doesn't change. On the crop camera it gives angles of view that "act like" a 16-35 would on full frame.

Just to clarify, the 10-22 is an EF-S "crop only" lens... It can't be fitted to and is not usable at all on a 5DII. The EF-S lenses have a special bayonet mount that will only allow them to be fitted onto the crop Canon cameras.

Third party "crop only" lenses use a standard EF mount, so can be fitted, but generally have a smaller image circle so will not work well on a full frame camera. Some lenses also have a retrofocus design, which means the rear elements protrude inside the camera. Retrofocus crop only lenses might physically intrude on the big mirror in a full frame camera such as 5DII. However, some work partially. I've tested my Tokina 12-24mm on 5DII and found that it works at least as wide as 18 or 19mm. But a full frame design lens is still better, with less wide angle distortion effects.

Hollywoodgt wrote in post #13919708
Expand on that if you will please. I understand the differnce in cameras, but was wondering if I was missing something. The T2I has produced some great images.

A back-up is typically a direct replacement to be used in the event of the failure of the primary device. By this definition, an APS-C body cannot be a back-up for a FF one unless you maintained a separate suite of lenses for that format. Then, it wouldn't be a back-up anyway, but rather an option.

A back-up for your 5D2 might be a 5D.

I just picked up a 10-22 and if your on a crop its the best wide angle out there. Although it only works on a crop, and I think it would be nice to have something you could use on both bodies..

shiftonephoto wrote in post #13923259
I just picked up a 10-22 and if your on a crop its the best wide angle out there. Although it only works on a crop, and I think it would be nice to have something you could use on both bodies..

Agreed....

Hollywoodgt wrote in post #13927470
Agreed....

so go with a 16-35L and forget about the crop factor.....