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Depth of field (DOF), simply put, is the portion of your photo that is perfectly in focus. Due to the nature of camera components and the way they interact with light, every photo you take (with some random exceptions we won’t get into) will be impacted by your focal length, the distance to your subject (the object or person you are photographing) and your aperture. There are several mathematical calculations involved in determining exactly what depth of field you can expect, but as my goal is to make this subject a simple and easy to remember as possible, I’m going to forgo those explanations for today. If you have some free time and want to explore this in more depth, I’d recommend checking out an online depth of field calculator.

Focal length: Greater focal length = shorter DOF. Distance to subject: Greater distance to subject = longer DOF.\ Aperture width: Wider aperture (smaller f number) = shorter DOF.

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Here is an example of how distance and focal length can impact your depth of field. The closer you are to your subject, the more likely you are to blur out the foreground and background of your photo. That probability increases as you increase your focal length by zooming in. I was less than two feet from Mr. Bug here (close enough for him to stare back at me) and had my lens extended all the way. Even though my aperture was set to a mid-range value of f6.3, the fore and backgrounds are pretty blurry, helping the eye focus on the subject in the center of the frame.

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In order to see where depth of field begins to blur the background, look toward the upper right of the photo. There we begin to see the legs and feet of people walking past start to go out of focus. I would have preferred a smaller depth of field but this was a “let me test my manual setting really quick” shot of this boy running past me. I was so focused on getting settings nailed down that I didn’t even notice he’d fallen until I checked my screen and by then he was up and gone!

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A small, tight, dark lens aperture lets less light into the camera, but because it is smaller, it focuses the light very sharply for a greater depth that extends in front of and behind the actual focus distance.

The size of an image sensor, whether digital or film, affects depth of field in a similar way to a lens aperture. This is because depth of field is a product of both the lens aperture and focal length, plus the sensor size relative to that aperture and focal length.

For good measure, here is another example with even greater depth of field. To capture this waterfall, I stood pretty close to the edge and shot alongside it while focusing midway across. Because I had a mid-range focal length and had my aperture opening pretty small, all the features in the photo are recognizable. You can clearly see the wall in the background and the rest of the waterfall in the foreground.

Set your camera mode to aperture priority (“A” on Nikon, “Av” on Canon) and work on creating that nice separation from the background. Focus on the ways of doing so that we discussed today.

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Diffuser Specialist Flat sheet replacement fluorescent light diffuser panels are constructed of extruded acrylic or polycarbonate plastic for best results and quality. They are available in many different styles, thicknesses and transparencies for different needs, and are usually used for lay-in fixture and other lighting applications. Popular applications for flat sheet light diffuser panels can be seen in schools, commercial buildings, hospitals, and almost all hallways because of their general quality and easy installation. Flat sheets are some of the most commonly used fluorescent light diffuser panels. Diffuser Specialist carries many versions and types of flat sheet, so that whatever your project is we’ve almost certainly got what you need. We can also custom produce flat sheet in sizes that are not commonly available, if you have non-standard-sized light fixtures. To order flat sheet light diffuser panels from Diffuser Specialist, simply fill out the form below. If you don’t see what you’re looking for in our order form, don’t hesitate to put any and all special requests & instructions you may have in the comments area below. Chances are we have it, and if we don’t – we’ll make it for you. Shop Flat Sheet Product Information Sheets For your convenience you can download, save and print the product information sheets below. [one_half] Specialty Film & Sheets Asymmetric Lenses T-10 620A (Asymmetric) Fluted PolyPropylene Microlinear® Twin Wall Vinyl Strip Cutrains     KWIK CHANGE™ Steel Door Frame Kits Steel Door Frame Kits and Retro Fit Kits [/one_half] [one_half_last] Filters Naturalux™ S82 Flexilume® Flex G2.0 Duri-Flex Prismatic P12 (Most Common) P23(Circular) P35 (Conical Female) P49 (Conical Male) P41 (Security) Micromid™ Smooth & Textured P10 Cracked Ice S80 Smooth/Smooth S81 Stipple S82 Matte / Smooth S84Lumieo® (Matte/Smooth) S84 Lumieo™II (Matte/Smooth) [/one_half_last] [one_half] Material We stock many materials that compose our flat sheets to best fit your needs. Contact us today for more information about our flat sheet materials or to find which style is best for your project: Acrylic Acrylic flat sheet is best used when yellowing and long-term use is a concern. Polycarbonate Polycarbonate is best used when the fixture is in a place of volatility and breakage is a concern. [/one_half] [one_half_last] Common Terms Flat sheet is also commonly termed: Flat lenses Light panels Diffuser panels Lay-in acrylic Prismatic lenses Troffer lenses Fluorescent diffusers [/one_half_last]

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You’ve purchased a camera, you’re out there taking photos, and you’ve made your way to one of the premier resources for all things photography on the web, so I know you want to learn how to create eye-popping photos! With that in mind, here’s an assignment that will help you take your photo taking skills to the next level…

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Here is an example of blurred background using my prime lens. Utilizing a lower aperture and getting close to my subject helped keep the face, snow, and ice sharp, but blurred out the background details that may have distracted from the shot.

Not only is this an example of “the decisive moment,” it is an example of a larger depth of field. This is achieved by being a bit further from the subject in the photo and by having a smaller aperture opening.

A large, bright lens aperture lets a lot of light into the camera and onto the image sensor, however such a big aperture also results in a very thin plane of focus, and a lot of foreground and/or background blur.

Diffuser Specialist assumes no responsibility for the suitability of luminaires and applications. The use of lenses near and above 70°C temperatures with high UV output light sources will cause degradation of the material.

From these photos you can clearly see that with minimal effort and a basic understanding of how to control just a single component of your camera, you are able to completely change the texture and appearance of your photos.

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Here you can see the dragonfly is in focus, but the grass behind is completely out of focus and blurry. I was close when I snapped this photo and was using my telephoto lens to allow me to get really focused in on my subject. This combination of closeness to the subject and use of a zoom lens enabled this level of background separation even though my aperture was at a mid-range setting.

Today, though, we’re keeping things simple and to the point. To break this somewhat complex interplay between your camera and light down into simpler concepts, remember:

You’ll quickly get the hang of it and be sharing photos that have all your friends praising your photography skills on the social media platform of your choice!