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It is I think. Not the one I am used to. I have never seen it and I have never found a proper way to apply it. Overthinking things, in my experience, always seem to ruin the picture.

Relations between depth of field and Aperture, focal distance and distance from object. Depth of Field (profundidade de campo in portuguese). PC1/PC2=a1/a2 ----- PC1/PC2=((d1)ˆ2/(d2)ˆ2) ----- PC1/PC2=((f2)ˆ2/(f1)ˆ2) -> PC(alpha)= (a.dˆ2)/fˆ2

It is in Portuguese but I see what I can do.

The Yes or No, just to see if you know the equation or not.

It is a proportionality coefficient, a ratio of some kind that would enable you to compare different focal lengths ...

Despite the fact that I found it on an old physics book, I can't seem to validate it, not in a physics sense of photography sense.

I was wondering through some books and I found the following formula. A 50mm lens focus an objet 3m away. A 25mm lens focus the same object 1,5m away. Same opening f/11 d = distance A = opening f = focal length Pc(alpha) = (A*dˆ2) / fˆ2 Pc - Proportionality. Is the formula valid?

"Dodging and burning are steps to take care of mistakes God made in establishing tonal relationships." Ansel Adams

Recently I went to Italy (Jan, 15th), I have wonderful friends in Milan. But one of the toughest pictures I took was in fact one of the easiest subjects I had. The Duomo di Milano. I took a picture one day with bright blue sky and the other, grey and cloudy (both with my trustworthy EOS 5d iii, B&W, I also used a M7). In such conditions I felt that neither my setups were ok. I never got 100% confident. When I see something that will go down just as a fragment in memory lane, I am not ashamed to say that I go 'full auto' and let it be done as fast as I can (before tourists kicks in). When something tells me that the picture could mean something else, I take some time to figure it out. One of my teachers always said to me the phrase "giving birth to a picture". The point is. When theory gets in the way of a good picture? The drama, between guts and theory, is always on my mind.

I'm using my Hasselblad 501cm (120) - Ilford Delta 120. Since I'm serving time (quarantine) I found enough time to re-read most of my books on photography and apply most of techniques I gather over the time (I'm 45). It is good to revisit some old notes and old pictures I took with this set up. Revealing is another story. My wife still thinks I'm going to indadvertedly blowup the house (I blew the stove once). I was thinking about a challenge (no, I'm not going to lick toilet seats). Let's take a picture B&W (digital) of something that we can put the test the old mantra. What do you think?

Is this supposed to be a mantra?

In light of this terrible corona virus outbreak I just wanna say 'I hope everybody is ok'. Stay strong and follow the rules of engagement. This is a serious battle but we will win the war.