Posts Tagged ‘depthoffield’

Using the Rare Canon 50mm f/1.0 and Its Bokehliciously Thin Depth of Field

The Canon 50mm f/1.0 was the fastest SLR lens in production before it was discontinued in 2000 and replaced with the f/1.2. There aren’t too many copies of this lens floating around on the used market, so photographers who want to use the ridiculous aperture it offers must pay a hefty premium in order to purchase one; the lenses commonly sell for two or three times the original retail value.

When reader Bryan Soderlind switched from film to digital a while back, he decided to splurge and go “all the way” by buying a 50mm f/1.0 for a little over $3,000 — a relative bargain. The lens was in “impeccable shape” and was in focus even when using the razor sharp depth of field at f/1.0. Here are some of his thoughts on what it’s like to use the lens, and some sample photos from his shoots.
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Lens Diffraction and How It Affects Your Photos

Really more useful for landscape and macro photographers who are going to be shooting through very small apertures (f/22 and above), this video from FStoppers explains what diffraction is and how it can affect your shots. The trade off, as they explain in the video, is between a large depth of field and a sharp image; and the trick is to find your “sweet-spot.”

The difference isn’t as obvious on the video even at 1080p, so if you want to see full resolution examples be sure to head over to the original post.

What is Lens Diffraction and When Does Diffraction Happen? [Fstoppers]

A Simple Lesson on Depth of Field

Here’s a simple lesson by Dylan Bennett on what depth of field is, how it works, and how to control it in your photography.

New Iris Blur in Photoshop CS6 Makes Faking Shallow Depth of Field Easy

Photoshop CS6 will have a new Iris Blur tool that lets you quickly add blur to an image that fakes a shallow depth of field. It’s a one tool-process that eschews the traditional methods of using masks, layers or depth maps.

You Can Increase Sharpness a Lot by Stopping Down Just a Little

You probably know that stopping down (i.e. increasing your f-stop number) can increase the sharpness of your subject, but how much should you stop down to boost resolution without losing that nice, creamy bokeh? Roger Cicala did some research on this question and writes:

For those lenses that do benefit, stopping down just to f/2.0 provides the majority of resolution improvement. The difference between wide open and f/2.0 is generally much greater than the difference between f/2.0 and the maximum resolution.

Getting the edges and corners sharp requires stopping down to at least f/4 for most wide-aperture primes, and some really need f/5.6. Stopping down to f/2.8 may maximize center sharpness but often makes only a slight difference in the corners, at least on a full-frame camera.

None of the lenses performed any better after f/5.6 (for the center) or f/8 for the corners. Most were clearly getting softer at f/11.

If you’re using a wide-aperture lens, stopping down to just f/2.0 will reap big gains in sharpness while still keeping the depth-of-field narrow. Furthermore, for some lenses you don’t really even need to worry about stopping down for sharpness, since it hasn’t a relatively negligible effect on the outcome.

Stop It Down. Just A Bit. [LensRentals]


Image credit: Margaritas a la bokeh by ganso.org

Focus Stacking for Speed: Researcher Invents Light-Efficient Photography

Google scientist Sam Hasinoff has come up with a technique called “light-efficient photography” that uses focus-stacking to reduce the amount of time exposures require. In traditional photography, increasing the depth of field in a scene requires reducing the size of the aperture, which reduces the amount of light hitting the sensor and increases the amount of time required to properly expose the photo. This can cause a problem in some situations, such as when a longer exposure would lead to motion blur in the scene.

Hasinoff’s technique allows a camera to capture a photo of equal exposure and equivalent depth of field in a much shorter amount of time. He proposes using a wide aperture to capture as much light as possible, and using software to compensate for the shallow depth of field by stacking multiple exposures. In the example shown above, the camera captures an identical photograph twice as fast by simply stacking two photos taken with larger apertures.

Light-Efficient Photography (via Amateur Photographer)

One Advantage of the Small Sensors in Cell Phone Cameras

Cell phone cameras have pretty poor image quality when compared with point-and-shoot cameras due to their small sensors, but one advantage they have over compact cameras is a naturally deep depth of field. That was particularly useful for this YouTube user in capturing some sharp video of his new motorcycle — something that would have been much more difficult using a standard point-and-shoot.

(via Fstoppers)

Samsung Might Give Compact Cameras Shallower DoF with Second Lens

A compact camera probably isn’t the first thing someone would grab when looking to make a photo with an extremely shallow depth-of-field, since the small aperture and small sensor limit it in this regard. That might soon be different: a recently published patent application by Samsung shows that the company is looking into producing achieving shallow depth of fields with compact cameras by using a second lens to create a depth map for each photo.
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A Detailed Explanation of Depth-of-field and the Factors That Affect It

Learning how to control depth of field with your camera isn’t too difficult, but do you know the science behind how it works? This uber-educational 20-minute video lesson gives a thorough explanation of depth of field and the different factors that affect it. It was made by artist Justin Snodgrass, and is also available for download (and in parts) over on his website.

(via Petrucci Francesco)

Frazier Ultimate Lens Shows Everything in Focus with Massive Depth of Field

The Frazier Ultimate lens is like the universe’s anti-matter to the Canon 50mm f/1.0 that we shared yesterday. Rather than have a tiny depth of field and tons of bokeh, the Frazier lens is one that has massive depth of field, allowing both the foreground and background of the image to be in focus at the same time. It’s widely used in Hollywood and in wildlife documentaries, and the video above shows some of the visual tricks you can do when having infinite DoF.

InfinityLens (via Reddit)