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| p.2 #9 · p.2 #9 · Seems like all I hear is "Full Frame, Full Frame, Full Frame." |
M Vers wrote:
Same framing, yes, but not the same 'effect' or look. While I don't think FF is the end-all of DSLR formats it does have superior DOF control over APS-H and, more noticeably, APS-C. Speaking in terms of format only I prefer FF>APS-H>APS-C.
The notion that FF has greater DoF is a misnomer IMO. The primary characteristic that controls DoF is the diameter of the pupil; the greater the diameter the shallower the DoF. If the If an 85mm lens at f/2 has a pupil diameter of 42.5mm, it's still going to be 42.5mm regardless of whether or not you use it on FF or APS-C. The differentiating factor is that if you use an 50mm at f/2 instead on APS-C your pupil diameter is going to be 25mm. Thus, you'd need to use a 50mm at f/1.2 to get roughly the equivalent DoF as an 85mm at f/2.
However, the inherent amount of DoF here is the same. Granted lens design variation means that the pupil diameter won't strictly be the focal length divided by the f-stop, but the principle stands. FF doesn't change the amount of DoF you get from your lenses--you're simply using longer lenses and the longer the lens shallower the DoF.
In practice, yes, full frame effectively has DoF that is 1 stop shallower than APS-C at an equivalent field of view. But, I think it's important to understand why this is the case. If you were to crop all your FF images to match the APS-C framing, you'd find that the results will be identical.
The other difference too is that, with FF, you're getting a wider field of view with equivalent focal lengths. The lens design obviously doesn't change, so in order to fill the frame one often works closer to the lens's MFD--thus reducing bokeh. It took me a month to adjust to this when I switched to FF. I was constantly running into the MFD on my lenses and struggling to get nicely framed food shots.
TDP ISO crops seem to point that the 24-105 is sharper even at 24mm vs 17mm.
Though both are excellent lenses I have no sharpness complaints about my 17-55f2.8IS.
I'd rather it didnt have zoom creep and it was weather sealed and a 15-60 or 70mm focal range!
You're also comparing a 21mp 1DsmkIII to a 15.1mp 50D and FF vs APS-C here. FF is inherently going to resolve more detail from lenses due to the fact that the individual photosites are larger. Downside is that the corner performance is typically worse than an APS-C camera with its sweet-spot effect. The corners look better to me on the 17mm from f/4 onwards on the TDP ISO crops, despite being a less sharp image overall. Incidentally, if I were working with UWA's my order of preference would be Nikkor 14-24 2.8 > Tokina 11-16 = Sigma 8-16 > any current Canon FF UWA offering.
For all the FF hype, any improvements in my images following my FF upgrade can be attributed to the following:
1. Having a camera with better high ISO. Though FF cameras undoubtedly have better noise performance on average, this isn't an entirely FF characteristic. Had the K-5 or D7000 been out at the time they would have been similarly good upgrades.
2. Going from 14.5 to 21mp.
3. Being pigeon-holed into buying 1k + L glass because most cheaper glass didn't perform at the already high level I was used to with my ~$500 lenses on APS-C.
4. Having a bigger viewfinder.
5. Having a FF sized sensor.
Don't get me wrong, I have absolutely no regrets upgrading to the 5dmk2 and would never go back to APS-C. But, this has more to do with me loving the bigger viewfinder and being more comfortable with the size of the larger body than anything else. However, FF is not the be-all-end all upgrade for everyone. For me, FF was worth the triple the expense of my APS-C sensor because a lot of my shooting is done in poor light and the viewfinder and ISO performance were invaluable. But, if I were a sports shooter the 5dmk2 would have been a *significant* step back from my previous setup in almost every category. The extra size, weight and cost can also be a detractor for a lot of people. I think it's important to sit down and precisely assess your shooting needs when choosing a system, rather than simply buying into the FF hype.