Wallen Loc: Middle Earth

This is an expansion of Step 7 in the “Practical Digital Photography for Beginners” post. The Illustration is a generalized representation and has been exaggerated in some parts to emphasize the
covered subjects. Focus Area, Focus Plane, Focus Disk & Focus Boundary are my own coined term to explain & present the process and elements of focus in photography.

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rook2c4 Loc: Philadelphia, PA USA

I think your chart would be rather confusing for most beginners. Too much information all at once, including information which is better suited for a photographer with intermediate skills.
For example, why would a beginner need to know what markings are on an old lens? Or an explanation on what bokeh is? Or what a focal plane symbol looks like? Or how to recognize a bad lens? Or what surface refraction is? And some things just need to be simplified a little more so not to overwhelm the beginner, using a camera for the first time. For example, instead of "acceptable focus", just call it "in focus". Instead of talking about bokeh, just call it "out of focus".
For an instruction chart intended for beginners to be effective, it must be simple and avoid anything beyond the most essential information to get the beginner started. Always keep the target reader in mind.

Wallen Loc: Middle Earth

Sorry if it seems that way. It is an expansion of a previous post where details about Focus are being addressed.
https://www.uglyhedgehog.com/t-575239-1.html

I actually trimmed it down as "Part 1". Wait till you see part 2



Because bokeh is something a newbie will always read & hear about but seldom explained. Range is a part of the subject Focus, which is being discussed and being a marking they would see on old lenses makes it a good example to cite.


Just like the other, they are integral part of Focus so they need to be included and discussed. Also because just like Bokeh, Focal plane is something a lot of photographers get confused with. Many believe it is the focus point on the subject when it is where the image is focused in the sensor or the film.
As for bad lens, beginners are usually the one who have cheap bad lenses. Hence it is good information of correlating what they might see with the information on the chart.


That is grade school science. (almost)Everybody should know what refraction is and it is the most basic reason i can provide to tell why making the iris further smaller do not make the image better.


(In focus)Sharp focus Area & out of focus are there in the chart. Bokeh & acceptable focus are explanation call-outs. Both of are there.
Please note that "acceptable focus" is part of DOF and only a very slim part of that is in focus. Only those that intersect the Focus Disk/Focus Plane are actually in focus. Everything else is blurred from a lesser to greater degree.


As stated, this is an expansion of a previous post. It is a little more in depth explanation of the previous subjects.

Wallen Loc: Middle Earth

Corrigendum

a. In Figure 2, it should be f/2 not f/4
b. In Figure 3A, it should read as Depth Of Field not Field Of View (DOF not FOV)

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Bill_de Loc: US

Just the fact that you have to explain what you mean to someone who has been around photography for a while, shows this is not ready for prime time where beginners are concerned. Your comment about what everybody should know further shows you are not inclined to help beginners.

IMHO
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Wallen Loc: Middle Earth

I respect your opinion but unless you have read the first post to which this was a series to; https://www.uglyhedgehog.com/t-575239-1.html
and the grey colored text on top just below the title of the graphic,
it would be judging an ocean by looking at a raindrop feeding a stream.

It also seem that you skipped the first part of the paragraph. "It is grade school science"-hence "(almost) everyone should know what diffraction means". As you see, i am not pushing anything to anyone. I'm stating that it is supposed to be common knowledge since such is taught in grade school.

If someone see something they do not understand, a person who want to learn would ask and i would be more than happy to provide my best. Those who do not, challenges the idea, sometimes to push their own. Either way, it is proper to explain why i view things a certain way.

As for the inclination to help others, i have been a volunteer for most of my life. I've been a noob too, I wont bother to share my ideas if i do not intend to help.

CO

It looks like a good chart but figure 4A states that hyperfocal makes all parts of the image sharp. With hyperfocal, everything from one-half the hyperfocal distance to infinity is in apparent focus. So if a hyperfocal calculator gives a distance of 20 feet, everything from 10 feet to infinity will be in apparent focus.

There may be a mistake in the last sentence under figure 4A. It says: "Its edges bends the light, blurring the image due to edge surface refraction." Refraction should be diffraction. Refraction occurs the when light is passing through a medium such as glass, water, and other materials

Wallen Loc: Middle Earth

You are absolutely correct about refraction which is the bending of light through an object. It is supposed to be diffraction which is bending of light around an object. It was a misprint on my side.

As for the A4 statement; "all parts of the image sharp" is a general accepted assumption but in reality is really just the "best compromise" as having all distances sharp is not physically possible. You can actually see it on the chart that it merely put most of the areas in yellow-"acceptable focus".