10988495

Ah ha! So it's a depth of field formula? If I remember right, you need a blur circle diameter (circle of confusion) to do depth of field, so this doesn't look quite right, or I don't see how it's in a useful form. If you can describe what you want to calculate, and from what inputs, any number of us can provide the correct formulas.

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

If you plug the numbers into the formula it gives you the result about 4 and 2 so what does that mean to you?

If you can scan at least the page of the book it would help.

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

Please elaborate on what is Pc means? The size of the subject?

Why do you want to make the vote Yes/No?

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

Please elaborate on what is Pc means? The size of the subject?

Why do you want to make the vote Yes/No?

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

What a load of tosh. Really.

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.

Hello! My account approving many days or even week! Do you know what I shoult to do?

Contact Administrator. He is always helpful.

Thanks for the help!

Thanks

Welcome aboard!

Thanks, photo.net is a wonderful project. Congratulation on the initiative.

The box should be air tight, otherwise the silica gel will just pull in humidity from the surroundings. A waterproof pelican type case will work but are normally not cheap, or try do an image google search on "japanese camera dry box" - I think they are available through ebay and may be less expensive if you don't need a pelican case.

Tried some ticks like adding an adhesive substance to help sealing the box. Well it is the best I can do for the moment being. I'll by something better eventually.

I inadvertently posted this topic twice. But I`ll try to correct it.

 

This is how I keep both my cameras and lenses. Any thoughts?

I bought a dry cabinet when I lived in humid Japan. It keeps your gear dry and free of dust. I’ve had mine for more than 10 years now and don’t know how I could live without it.

I keep trying to find a dry cabinet but if I even think about bringing anything home my wife will kick me out...

Assume that's a typo and you mean "mould (ENG) / mold (USA) and humidity" -

 

Air circulation is important, I live in an humid climate and I keep my gear in a well ventilated steel cabinet located on an interior wall of a room away from the kitchen and bathroom. I don't store my gear in camera bags or lenses cases.

 

WW

The curse of autocorrect... Thanks. I put my lenses on transparent boxes with a dehumidifier. Trying to keep humidity below 50%. However, I am considering moving the boxes because it is wall to wall with the bathroom. I had already problems with my EOS-1N.

The way things are set up now, the best place to get critiques is at Seeking Critique

 

Patience is required, since it sometimes takes a while for people to discover and comment. It's more likely to work if you post an interesting image - just one at a time.

 

Welcome to P.net;)

Thanks for the help!

Any tips and tricks about storing/cleaning lenses and cameras? Describe your setup.

I'm searching for new ways to keep my lenses and cameras safe from old and humidity any tips and tricks to share?

My name is Mauricio Fleury and I am new to photo.net. I've been taking pictures for eons now and I really would enjoy a good old critique about my pics. Thanks!