Rethinking 4/3 Depth Of Field

Started Apr 11, 2013 | Discussions thread
Anders W
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Re: Rethinking 4/3 Depth Of Field
In reply to zxaar, Apr 12, 2013

zxaar wrote:

Anders W wrote:

olliess wrote:

Anders W wrote:

exdeejjjaaaa wrote:

Anders W wrote:

At high ISOs, which is what the OP was talking about, the E-M5 set at two stops lower ISO than the FF camera (for equal DoF), will go equal for SNR at midtones but do better with regard to shadow noise/DR in comparison with all current FF cameras except the D4 (where it will be a tie).

it is soundly beaten by DR @ high ISO even by Canon (1Dx).

Please read what both the OP and I were actually talking about. With the E-M5 at ISO 3200 and the 1Dx at ISO 12800 for equal DoF, the E-M5 will come out slightly ahead.

From the DxO measurements that doesn't look to be the case for DR between the 1Dx and the E-M5. Interestingly it looks as if the 1Dx beats out the D4 slightly in DR above ISO 2200 or so..

Yes, you are right. I was too quick when checking the graph. So the D4, 6D, and 1Dx belong to the group that ties with the E-M5, when the E-M5 can shoot at two stops lower ISO for equal DoF. The D800, D600, 5D3, and A99 belong to the group that the E-M5 beats.

in practice it does not really matter.

Of course it does. Why wouldn't it?

The FF shooter does not always have to shoot at the DOF that omd would be shooting.

Who said that such was the case? And so what?

The fact is that the FF advantage is a sometimes thing, not an always thing. And that sometimes tables are turned and the smaller sensor has the upper hand.

If smaller sensor is the one deciding on dof then I would advise the omd users to first shoot with cell phone then calculate equivalent F number based on dof and shoot accordingly. So you are holding a larger sensor camera then it is irrelevant what the smaller sensor camera would be doing there.

When you are holding a specific camera, no matter which, it is of course irrelevant in the shooting situation what you would do with another camera in the same situation. Who has said anything to the contrary?

When choosing between systems, by contrast, it is useful to think of what this or that camera with this or that sensor size could accomplish in different situations.

Further if someone is always looking for deepest dof , he shall be better with pentax q type system, omd does not have small enough sensor for that.

You are putting up one straw-man after another. Noone has said that we should always look for the deepest DoF.

The interesting criterion is "deep enough" and "shallow enough" rather than maximally deep. What is deep enough and shallow enough is of course at least partly a matter of personal preferences. All I can say here is that the DoF I get when shooting fast primes wide open on MFT is frequently deep enough as well as shallow enough (when I want shallow) to fit the bill. This in turn means that the benefits of FF would be marginal for my use. It also means that Pentax Q would be too small a sensor for my usage. In many cases, I would be locked in with more DoF and more noise than I want.

Since I know the implications of sensor size in and out since quite a few years, and also know what I typically want/need in terms of DoF since many years, I thought these matters through very carefully before taking the plunge into MFT. The sensor size is in this case just on the lower border of what I find acceptable. It works just fine for me in most cases, particularly since the fast MFT primes are in most cases very good already wide open. But I wouldn't want to go any further downwards, not even to the Nikon 1 sensor size. Nor would I want to move in the opposite direction since that just implies marginal benefits but significant costs in terms of bulk/weight.

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