Author Archive

All in Focus or All Sharp – You can’t have Both

April 24, 2014

Summary – Depth of Field (the area in focus) and Diffraction (affects sharpness) are a basic photography tradeoff. In general, one comes at the expense of the other. Some illustrated examples (without the physics).

 


COME ONE, COME ALL

Enter the Nature ExhibitDetails here

Check out the Nature Exhibit entries to date

 


So – you want the nearest to farthest points in a scene in focus

(this is depth of field)

You also want sharpness throughout

(diffraction can cause loss of sharpness)

Bottom line – you can’t have both

(unless the subject is a flat surface AND

you’ve aligned the sensor face with that surface)

.

Post based on an email from a reader
Who noticed I used f/51 on an image in a recent post
Asked about diffraction

.


This post assumes you know that

As you change your aperture to higher numbers

f/22 for example (not f/4)

Two things happen to the resulting capture

1. More of the scene (near to far) is in focus

2. Sharpness can be lost (blurriness sets in)

All else equal, the results are sensor size dependent

If you want a comprehensive discussion

Search the net on DOF and diffraction

My main intent is to show examples

Not to teach a course in physics ;)


The illustration subject is a camera bag

Lots of texture detail to judge sharpness

Tilted back from the camera to judge DOF

I focused precisely (Liveview X10) on the

Pointy-bottom at the center of the letter M

Keep your eye near here for diffraction effects

Aperture was changed in 1-stop increments

f/4, f/5.6, f/8, f/11, f/16, f/22

For this camera (Pixel Diameter: 5.5 µm)

Diffraction should become noticeable at about f/11

Nikon D300 + high quality Nikkor 105mm macro lens

Tripod & remote shutter release for stability

——————————————————-

Roll over for f/4 vs f/22 comparison

The DOF change is very obvious

(Recall that the bag is tilted away from the camera)

The loss of sharpness is nearly imperceptible

.

I focused on the M’s point in DOMKE

2014-04-23_9-52-33 2014-04-23_9-53-31

This next series is f/4 through f/22 in 1-stop increments

 Click on f/4 (top left) and step through via right arrow

To see the gradual change

Or – from f/4, toggle backward & forward to|from f/22

To see the big change  in DOF, but

The sharpness loss near the M is barely noticeable


Rollover for another view of the two extremes

You can actually see the loss of sharpness near M’s point

That’s a “big-whoop” (from cynical me)

2014-04-23_9-54-31

2014-04-23_9-55-51

 .

Conclusions?

Draw your own….

For my style

DOF (both shallow & large)

is very important

Diffraction concerns

aren’t foremost in my mind

If f/8 or less gives me the DOF I want

I won’t stop down further unnecessarily

Nor will I stay at f/8 or lower

If it doesn‘t provide the DOF I want

For my style, diffraction concerns are over-blown

For you, only you can decide

Test your gear and do it on a variety of subject matter

Macro, close up, landscape, portrait – the works

Do not, as some do, refuse to go above f/8

Simply because you read somewhere that was bad

Shoot for yourself – not theoretical-number-rules

For me & my style

Big DOF changes (in either extreme) are

Far more important (and noticeable)

Than slight changes in sharpness

Arty needs selective (shallow) focus

Landscapes need a large DOF (usually)

In neither case should diffraction concerns

Be over-riding (IMO)

Focus stacking software might be a consideration

I’ve never felt the need

Not anal-compulsive enough I guess ;)

 


Subscribe (see sidebar) and don’t miss anything. New posts daily.

  • No sidebar? Click the blog title at the top of this page.

Another option – Click on the “Follow” button at the bottom right of the screen.

  • Or - “Follow” in your admin bar, displayed at the top of the screen, for logged-in WordPress.com users.

Spring Has Sprung – Red & Pink Dogwoods

April 23, 2014

Summary – Just a bunch of pretty pictures of one of my spring favorites. © Moi

 


COME ONE, COME ALL

Enter the Nature ExhibitDetails here

Check out the Nature Exhibit entries to date

 


.

Click on any image for a full screen slide show

 

.


Subscribe (see sidebar) and don’t miss anything. New posts daily.

  • No sidebar? Click the blog title at the top of this page.

Another option – Click on the “Follow” button at the bottom right of the screen.

  • Or - “Follow” in your admin bar, displayed at the top of the screen, for logged-in WordPress.com users.

Artistic Intent & Depth of Field

April 22, 2014

Summary – Depth of field is a powerful technique when it comes to artistic intent. No, everything does not have to be in sharp focus – unless you’re a competition judge ;-)


001D300-_140421_093321__DSC1021_cep brdrblog

Spring Has Sprung (neighbor’s dogwood 4/21/14)

To each his own, but for me shallow depth of field is artsy

Without it, backgrounds are distracting & the rest is too busy

I want to show you the subject – with no doubt what & where it is

And reduce the rest to soft pleasing context


Scroll over the following images to see aperture setting
Click on image for slide show

.

Changing Aperture; Fixed Focus Point

Changing Aperture; Fixed Focus Point

 Changing Aperture; Fixed Focus Point

Fixed Aperture; Changed Focus Point

Easter Lily in my sun room 4/21/14


Subscribe (see sidebar). New posts daily.

  • No sidebar? Click here or the blog title at the top of this page.

Another option – Click on the “Follow” button at the bottom right of the screen.

  • Or - “Follow” in your admin bar, displayed at the top of the screen, for logged-in WordPress.com users.

Approaching 500,000 Blog Views

April 21, 2014

Summary – A little blog trivia to accompany a photo or two.


07_DSC4799_nx_resize

Don’t Fence Me In

Even though the Nature Exhibit is just beginning

Time to start planning for what’s ahead

How about Black & White (including infrared as shown here)?

Interested? Reply if you are.


I started this blog in January 2010

It began based on a request to teach a photography course

It followed that vein for about two years

Course contents are documented in the

Table of Contents

Scroll the page forever ;-)

The next major endeavor was

A Nik Software tutorial series

If you looked at the TOC they’re right at the top

The most viewed part of this blog ~100,000

Now I’m doing – whatever

Mainly scratching an itch to write

(Every day without fail since 1/1/12)

I’ve asked for requests -

Could count them on one hand with fingers left over

Here’s my stats during that period

2014-04-20_10-12-58

Meager by the measure of popular blogs

But I decided to show mine as the

View total approaches 1/2 million

To boost one’s stats (frankly, Scarlet, I don’t give a damn)

Starts with “I’ll scratch your back if you do mine”

Never have & never will ;-)

And relies heavily on social media

I don’t

Look at some photo blogs with

Ordinary at best photos and no other content

Except maybe a title for the photo

Some have >1K followers and > a million views

Look at their comments and you’ll find hundreds like

Thanks for liking my site

If that’s what floats your boat – go for it

.

Back to my itch

 


Subscribe (see sidebar). New posts daily.

  • No sidebar? Click here or the blog title at the top of this page.

Another option – Click on the “Follow” button at the bottom right of the screen.

  • Or - “Follow” in your admin bar, displayed at the top of the screen, for logged-in WordPress.com users.

Nature Exhibit – FOLLOW THE RULES, PLEASE!!

April 20, 2014

Summary – The good news: two entries within the 1st 5 hours. The bad news; one was wrong on two counts. :(


Sunrise

Be original

You don’t have to travel far (above – walking distance from home)

Chances are if you do make that special trip to a photo icon

It’s to capture the same image as 1000′s of others – not original

I’d rather not see half-dome again ;)

Also, try showing your subject, whatever it is, using a creative eye

And not the same composition style that everyone else might use

Get down in the weeds (or cat-tails as the case might be)

Don’t be afraid of getting wet or dirty or both

Give the viewer something to view

It’s the viewer’s eye that should travel; not the photographer


Let’s try this ONE MORE TIME -

The entry rules are simple

If something is confusing, PLEASE let me know

A large percentage of the previous Abstract Exhibit entries

Had problems with not following simple rules, most often

1 – Sent to the wrong address

Just because you know another of my addresses,

DO NOT use it (11 abstract entries)

Use the one below

edkphoto@comcast.net

2 – Incorrect image size (pixels on long side)

14 of 78 abstract entries

I want 1024 pixels on long side

3 – other problems (4)

Life is too short (29 entries to “fix!!”)

May not seem like much, but it adds up

.

So – new exhibit & one of the 1st two entries was this next one -

Shown is the full size image

320 pixels high – and not 1024 as called for

Here’s a tip -

Include the image as an actual attachment

If you simply embed it in the body of the e-mail,

Your e-mail program may shrink it (or not)

A word to the wise….

Also – look at the right side of the image

Images are NOT to contain the hand-of-man (HOM)

Sorry if you think otherwise, but that is the HOM

The path|road|trail|whatever was made by man

It doesn’t have to be paved to be so

Let this be your general guideline – if man had been involved with anything in the image, it will not qualify

Don’t think “it’s incidental” to the story makes it OK

Anything means anything

.

Nit-picky maybe BUT most exhibits even would consider the row of trees HOM as they obviously didn’t “spring-up” naturally like that

.

If you have to wonder about it, substitute another image; if in doubt, it’s out

The other (correct) entry can be seen here

.

Exhibit Subject Matter

Nature, the outdoors

Without the hand of man (HOM)

Read here if HOM is new to you

Unless you have absolutely NO doubt about

What is & is not the HOM,

Check out the above link!

ALSO – no wildlife; saving that theme for later

A bird flying through the scene is OK

But not as the main subject; just incidental

.

Yes, I’m a crotchety-old-grouch

Otherwise known as a curmudgeon :( ;)


Entry Rules (repeated one last time from yesterday’s post) -

#1 – One entry per person

Entries open immediately

Entries close 5/31/14 or after 100 entries (whichever is 1st)

#2 – Send entries to edkphoto@comcast.net (NO other address)

Subject line: Nature Exhibit Entry

Body:

Your name

Country

Image Title

Critique desired? Yes or No

Attachment:

JPEG file (NO other format)

1024 pixels on the long side

Not 300 and not 3,000 but 1024

.

I will reply to all entries (if sent to correct address) with either:

Thank you, or

Doesn’t conform to rules, or

HOM – not accepted

Wrong address? In the Trash :(

.

Entries will be displayed

In a gallery in the order received

As soon as I send the acknowledgement reply

The only identification will be a number until

Viewer’s Choice and Equal Merit selections are done

(mid-June)

.

The work must be yours

You retain all rights to the image

I will show suitable copyright markings

© by the photographer 2014

Email edkphoto@comcast.net for details

And will substitute your name after the exhibit closes

.

A heads up -

Strive for originality

Images that look like those seen over & over

Won’t score high in the critique’s

Creativity and Communication areas

Unoriginal images are average at best

 


Subscribe (see sidebar). New posts daily.

  • No sidebar? Click here or the blog title at the top of this page.

Another option – Click on the “Follow” button at the bottom right of the screen.

  • Or - “Follow” in your admin bar, displayed at the top of the screen, for logged-in WordPress.com users.


Follow

Get every new post delivered to your Inbox.

Join 730 other followers

%d bloggers like this: