Showing posts with label depth of field. Show all posts
Showing posts with label depth of field. Show all posts

Wednesday, April 29, 2020

The Window VIII :: Getting really close


When you think there is nothing more to challenge your photographic desires taking photos of TheWindow, its time to get closer.  "The closer you are too the subject, the more detail you see and the greater the impact of your photograph" ... Rich Sammon. This advice is not new but now is a perfect time to take the advice seriously.

You actually don't need a specialist macro lens, although they can simplify the tasks when getting really close up. You can use any lens really, but there will be a few challenges to address.

118/336 the sunniest spot in the house
Most lenses have a minimum distance that they can focus and in general terms the longer the focal length the greater the minimum focusing distance. This can work against you when trying to use the magnification capability of a telephoto lens to get a larger image. With your impressive Telephone Zoom you might have to stand a meter or more away!  Whereas with your wide angle lens you could get with a few centimetres.

The next obstacle is depth of field which is a bigger topic than I need to address in full here, where by the longer the focal length of the lens the shorter can be the width over which the camera is able to achieve sharp focus and to confuse things the Aperture (which controls the amount of light let through the lens) also affects the apparent depth of field. Wider Aperture (lower f-stops) narrow the zone within which the focus seems sharp.

118/366 I did tell you the Windows needed cleaning
The distance to the subject also affect perspective. Wider angle lenses (lower focal distance of the lens) make close objects seem larger. Telephotos (large focal length lens) make distant objects appear larger and more similar in size to close objects (they seem to compress space). This difference can be amplified for close up photo.

The final issue that might prove a challenge is the about of light. Consider that there is only a fixed amount light coming off a subject so as you use more magnification. The amount of light landing on a given sized pixel in you sensor gets less. You will need to either expose longer of move to a wide aperture. Leading to the possibility of blurring via camera shake or soft focus due to a narrower depth of field.

I'm deliberately not telling you how to find the compromise between all these issues. I'd rather you figured this out yourself. You should have plenty of time to work through your solution. No need to keep those trial photos this is an exercise in understanding not make a single great photo. However I found this nice explanation of what depth of field Is and Isn't on a new YouTube channel called Photography Online. Its quiet an informative show so perhaps check out some of the earlier episodes as well.



"When you think you are close enough, Get closer"
... Rich Sammon

Monday, May 14, 2018

Day Three … A is also for Aperture Priority

I’m leaving the new camera owners to play around with their camera and find what it is capable off. Also the big surprise with my new Olympus OMD E M10iii was how good the jpeg was straight out of the camera (I noticed this because I wanted to just look at the images straight out of the camera and not processed in any way when I post examples in here). Purest might argue that the camera is actually doing some important post processing, and I can only agree with that. This only reinforces the idea that not recommending new camera owners only shoot raw and use manual mode, because it is likely  to leave them with discouraging results. Instead if you are a new camera owner, I think you are much better to stay playing in jpeg and have fun with your camera. The results will be good and you will still be able to improve as you understand your cameras strength (and perhaps weakness).

Unfortunately I couldn’t wait, to follow my own advice, I’m jumping ahead and switching over to the traditional modes, starting with Aperture Priority. On my new Olympus this is marked by a single A on the mode dial. On a Canon camera it is Av. I’m probably letting a secret out of the bag but a lot of photographers, the majority of those I know, (there is even a current survey over on Digital Photography School that also supports this) shoot in this A mode. In this mode you must select the Aperture (which controls how much light is let into the camera, and probably the ISO (the sensitivity of the sensor to that light) and the camera will work out the shutter speed to get an average exposure. This is the mode I usually use, and my excuse is I got into this habit back when I bought the original Pentax Spotmatic film camera many decades ago. It was a technical marvel at the time because you could set the aperture and then use the built in light meter (not a common feature at the time) to balance a needle horizontally in the screen by moving the shutter speed dial. It was magic and it got good results. Ok the shutter speed dial is gone on most cameras and the camera does the balancing itself without showing a big needle in the middle of the screen but it works much the same way.

The big advantage of using Aperture priority is its simple to use and pretty logical. In normal light you can pretty well always use a middle f-stop like f8, in darker situation you may want to open up and got to a lower fstop like f5.6 or lower. Let more light in when its darker, its logical.  With this basic knowledge and your camera in Aperture priority and you will normally be able to get a decent exposure in a wide variety of lighting conditions. Its not fail safe, there can be a downside if the camera chooses a very slow shutter speed (less that say 1/30 second) you may find a hand held camera is inevitably moved a little and your exposure gets a little blurred. Most modern cameras have some built in logic to avoid this and might blink the shutter speed in the viewfinder to highlight that the exposure is getting too slow and out of a safe range. Alternatively the camera may allow ISO to be adjusted within a nominated range by increasing the sensitivity (a higher ISO) in order to keep the shutter speed as fast (quick) as needed.

There can also be a creative advantage (or hinderance) in being able to choosing the Aperture, and that relates to how closely the camera focuses on your subject. In simple terms a tiny hole (like a pin hole camera or say f22) lets the lens focus on a wide range of distances onto the sensor. The bigger the size of the aperture the lower the range the lens can get in focus either side of whatever you choose to focus on. This phenomena is called Depth of Field. As the fstop gets smaller (the aperture is opened wider) and the depth of field gets narrower. Portrait photographer for example often use the feature to get the subject’s face in focus but blur the background to remove fussy distracting detail.  Alternative a Landscape photographer might want everything in focus so they will usually use a narrow aperture, f11 is a good starting point. There are many ways to use this sharpness or blurring creatively. The smaller the fstop of your lens the more power you get too blur but usually the more expensive the lens.

A narrow Aperture F11- Widest Depth of FieldAn Average Aperture F8- Medium Depth of FieldA Wide Aperture F5.6- Narrow Depth of Field

In the three photos above you can see this depth of field control at work. In all cases I focussed on the blade tip of my safety knife (also know as a Box cutter in the USA) which is opposite the 20cm (approx 8”) mark on my metal ruler. At f11 (a smaller aperture hole) you can easily read the markers out to 31cm (12”) mark before the marks and numbers start to become blurred. With the aperture set to f8 the scale starts to blur between 26 & 27 cm (between 10” & 11”) mark. At f5.6 the blurring starts at the 25cm (10”) mark. The important thing also to notice is that my pink plastic safety cutter is pretty much the same exposure in the three images because the camera automatically changed the shutter speed (and in my case also the ISO) to achieve this.

After becoming happy with Auto mode, I believe a new camera owner should next get the courage to try A mode (Aperture Priority). Moving to A will let resulting photos stay nicely exposed and occasionally you could start to pull off really good creative shots by  experimenting with and controlling depth of field. However don’t race out and buy an expensive fast lens (with a low f-stop number) just to become a bokeh master right now. Experiment with the lens(es) you have (a lot of kit lens will be f4 or f5.6, but they’ll be just fine to start).

Tuesday, April 02, 2013

Extreme DOF @fter Pan


Extreme DOF @fter pan, originally uploaded by imageo.

For some time I have realised that using anti-shake and auto focus while panning after birds in flight was counter productive. Most often I missed the great shot as the lens drives back and forth trying to focus or worse it would find something well in the background, behind the action and I have a blurred bird.  So I’ve been brave and stopped down a bit (eg f8 of higher, to get a bit of latitude in depth of field, DOF) and manual focussed in the middle distance where I expected the bird to fly. Then I set the camera into multi-shoot and follow the birds flight in a conventional smooth pan with my finger held down. Depending on the light I usually get a better sequence with just a little motion blur in the background (see below). However the photo above is the last shot in the sequence just as the sea gull is flying out of my depth field range and the distant background, well up the beach, is out of focus. Giving it a pleasingly ambiguous “into the unknown feel”

IMG_0707-10IMG_0706-9IMG_0705-8

Saturday, July 16, 2011

Comparing a Cameraphone & DSLR II

Pentax 20D DSLRPentax 20D DSLRPentax 20D DSLRPentax 20D DSLR

.VS.

Nokia 6120 classic cameraphoneNokia 6120 classic cameraphoneNokia 6120 classic cameraphoneNokia 6120 classic cameraphone

Clearly at the macro level (Close Up) there is a massive difference in what a simple lensed camerephone and a DSLR with a specialist marco lens captures. Its probably not a fair comparison. Beginning with the exposure, the depth of field, and colour fidelity everything is better in the top row, yet you can still recognize what has been photographed by the phone.

Friday, July 03, 2009

Sun Showers

 
My tree ferns looked totally dead back in February, now they are enjoying the sun showers. Taken with my telephoto lens to allow me to restrict the depth of field, and blur the background.
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Friday, December 15, 2006

the fruit bowl


the fruit bowl, originally uploaded by imageo.

Just mucking around took this still life with a telephoto lens to compress the depth of field (and throw the background out of focus). It worked well by the way.