Is FF sensors going to slowly phase out?

Started Apr 11, 2013 | Discussions thread
oklaphotog Senior Member • Posts: 1,093
Re: Is FF sensors going to slowly phase out?

EinsteinsGhost wrote:

dpyy wrote:

Why is DoF only an advantage for shorter focal lengths?

Because at longer focal lengths, you start getting options on APS-C and DoF becomes shallower. For example, 200mm f/2.8 on APS-C compares to FoV and DoF of 300mm f/4 on FF. Yes, you can go shallower on FF by using a 300mm f/2.8 lens instead, but now cost and weight issues creep in. Also, at some point, shallow DoF can become too shallow and you'd end up stopping down anyway (a fact with macro lenses, for example).

This is exactly correct. On APS with 200mm F5.6 focused to 30 ft, you get 1.52ft DOF. On Full Frame with 300mm F5.6 focused to 30ft you get 1ft DOF. That's a difference of 6" and is hardly anything worth writing home about. When you go even longer in focal length, you often need to stop down just to get enough DOF.

Wide lenses have much more DOF for any given aperture, so if you want shallow DOF with one, you need all the help you can get. Generally most people shooting a wide want a fair bit of DOF anyway. Not to mention that most fast lenses wider than 35mm suck on the edges until they are stopped down a bit.

The DOF argument between APS and FF is really a moot point. I've shot FF for years, and the difference between the two is very little in most real world shooting situations. When FF hit the scene, people moved to it for better noise control and because at the time there were no truly ultrawide options for APS cameras. DOF wasn't a reason. This whole DOF argument is a relatively recent phenomenon.

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