This post covers both assignment 1 and assignment 2 because I want to illustrate the difference between the shallow depth of field of the wider apertures and the deep depth of field of the narrower apertures.  These were all taken on Parliament Hill in Ottawa during the 2011 National Tulip Festival.  They are all similar photos of the Peace Tower.

First are two almost identical photos that both use a singular theme aperture of f/4 but focus at different distances from the camera (focus on different objects).

28 mm, ISO 400, f/4, 1/640 sec.

26 mm, ISO 400, f/4, 1/900 sec.

Though the composition and exposure settings are very similar in these two photos the shallow depth of field means the main subject changes depending on where the focus is.  In the first the focus is on the Peace tower so that becomes the main subject of the photo and the burred tulip takes a supporting roll.  In the second the tulip is the main subject and the tower a background element.  The tower is still recognizable and is included to give some context as to where the tulip is located (This isn’t just any tulip, it’s in the capital of Canada) but it is not the subject this photo.   The next photo uses a deeper depth of field to show both a tulip and the tower.

34 mm, ISO 1000, f/18, 1/125 sec.

The narrow aperture (f/18) of this photo means that there is a much deeper depth of field and while the focus is still on the peace tower the tulip is sharper than the first photo.  It still isn’t tack sharp like in the second photo, but it is much more in focus than the first.   In this photo the tulip is less of an accent and more a part of the overall story of the image.  The background and the foreground work together to tell the story of where we are and the flowers that are there.  Notice that I required a much higher ISO (1000) to get the shutter speed down to something manageable to hand hold.  The narrow aperture means less light gets in and I needed to slow the shutter speed for a proper exposure.  The speed got so slow that I had to up the ISO to keep it manageable.  Alternatively I could have used a tripod, but I did not have one available on this trip.

These last two photos a little bit wider shots that use a somewhat narrower aperture to show a bit more of the parliament buildings and the tulip beds around them.

18 mm, ISO 400, f/11, 1/100 sec.

18 mm, ISO 400, f/13, 1/100 sec.

These two photos use something closer to a “who cares?” aperture, but again the intent was a deep depth of field to maintain focus from the foreground to the background.  The apertures used were sufficient to achieve that.  These pictures give an idea of the flowerbeds around parliament hill.

I have another post of some more abstract photos that I took around the tulip festival and I will try to get those up a little later.

Last weekend I went down to see the Ottawa Tulip Festival.  I’ve been here for many years and have actually never been down to see the tulips before.  I have a few sets of pictures that I would like to post.  This first set is from Commissioner’s Park and is those that fit Assignment 2 – Shallow Depth of Field.

I only had my 18-200 mm lens with me so I didn’t have the extremely shallow depth of field available that my 50 mm f/1.8 offers.

18 mm, ISO 200, f/4.5, 1/800.

These two tulips were somewhat isolated from the others in the bed, but I still wanted to ensure that they were isolated from those around them and from anything in the background.  A “who cares?” aperture may have been more appropriate, but then the trees in the background would be a bit more distracting.  I really like the way the extreme back lighting here makes the petals glow, but there is still enough light to see some green in the stems.  This would have been a good opportunity to use a reflector to bounce some light back to light up the shadows in the foreground.  This is a tight crop from a much wider photo but I wanted to focus on these two flowers.  This one had the most Lightroom post processing from the set.  I played with the exposure and recovery sliders to bring out the blue of the sky (I did have my polarizer on, but shooting right into the sun it does not do too much) and I even adjusted the blue luminosity and saturation to bring it out even more.  I also spot healed some blemishes and holes on the petals.

200 mm, ISO 200, f/5.6, 1/400 sec.

Another flower isolation shot, although this one has a different feel to it altogether.  Here the shallow depth of field really isolates the one tulip but the out of focus tulips in the background give the impression that this flower is not alone in the flowerbed.  The dark trees in the background also blur to the point that they are just black or a very dark green.  Again this is a back lit subject which makes the petals glow over the intentionally underexposed background.  I used the spot metering mode to get the correct exposure for just the petals, recomposed and took the shot.  I like the way the back lighting (slightly to the side) highlights the edge of the stem.

200 mm, ISO 200, f/5.6, 1/200 sec.

200 mm, ISO 200, f/5.6, 1/200 sec.

In these two captures I used a “singular theme aperture” but is not really a single subject that is the main focus of the picture.  In this case the narrow depth of field highlights several tulips that are all the same distance from the lens and blurs those that are closer or further away.  This gives a sense that the tulips are part of a much bigger crowd, which they were.  I seemed to be in a back light mood.

65 mm, ISO 200, f/5, 1/500 sec.

Another group shot of the flowers, though front lit this time.  Again there is no single subject but the large aperture (small f/stop) narrows the depth of field and as the tulips blur towards the top of the frame it implies that the flower bed goes on much further even though that is near the edge of this particular flower bed.

135 mm, ISO 200, f/5.6, 1/400 sec.

The last of this group is a different perspective than the rest.  I don’t have a good macro lens or macro capabilities so I don’t do too many of these shots.  I used a wide aperture to put the background out of focus because the dirt and leaves in the background would only distract from the main subject.

I am finding that using a wide aperture to isolate a subject is probably the easiest of the first three assignments.  When you blur the background (and foreground) it is easy to remove distracting elements and not have to worry about your composition as much.  It is the deep depth of field shots where you really have to think on different plans and control how many different elements interact with one another.

I have many other photos from this bike ride that I would like to share.  I hope to get them up over the next few days.

I took this today and was thrilled at how it turned out.  I wanted to post it right away and I will discuss it more later.

I posted some pictures from the Stella Ultimate (Frisbee) tryouts from a week or two ago.

It was fairly dark under the lights so I set a somewhat slow (for sports) shutter speed of 1/160 sec. and opened the aperture as wide as possible (varied depending on zoom) and used the auto ISO function to compensate for the changing aperture.  Most of the pictures have an extremely high ISO and are quite grainy, but that is too be expected in such harsh conditions.  When they are shrunk down to web size they don’t look so bad.

It was tryouts so I was hoping for some layouts from people trying really hard but there were not many to found (even though there were some good opportunities).

Working on my phd does not leave a lot of time for taking pictures but the other day I had to take some pictures of my prototype robotic manipulator to put into a conference paper.  I don’t have a lot of lighting experience (any really) and did not have too much equipment  to work with, but I scrounged up a black curtain to use as a backdrop and a desk lamp to supplement the terrible florescent lighting in the lab.  I tried a few different poses of the arm ( we don’t have motors for it yet, but I am able to statically pose it in some orientations) and moved the single light source around until it looked decent.

ISO 200, f/10, 3 sec.

The ambient lighting in the room was terrible, the desk light did not add a lot and I wanted to use a medium sized aperture to ensure that the entire robot was in sharp focus so this meant an exposure time of 3 seconds.  I could have upped the ISO but I was shooting with the camera on a tripod and tethered to my computer so I was able to keep the camera steady for the long exposure.  The resulting photo is quite sharp, especially since it is to be used in a quite small format when published in the conference paper.

For the paper I converted it to black and white and played with the exposure settings in Lightroom to make it stand out nicely from the background.

The biggest issue I have with the final result is the over exposure of the large plate at the left.  I believe it was catching the florescent lights of the lab at just the right angle that during the 3 second exposure it was enough to create that highlight.  It isn’t a perfect photo but it is quite suitable for use in the conference paper.

I don’t want to get into too many details about the robot arm, but my thesis work focuses on the architecture of the joints in the arm.  For fun they are called “Jim-Joints” but officially we call them algebraic screw pairs (or A-pairs).  If you are really curious there are some publications about them listed here, but they probably aren’t the easiest read.

Another couple of pictures from the farm.  It seems that that is the only time I am getting out with my camera lately.

ISO 800, f/8, 1/400sec.

With the tree being the only subject in this photo and the sky being completely flat the depth of field was not really a consideration so it did not really matter which aperture I used.  Therefore i used a “who cares” aperture to get a medium depth of field in the hopes of getting a sharp photo.

ISO 800, f/8, 1/800 sec.

There was only snow in the background so it didn’t really matter what aperture I used since she would be somewhat isolated no matter what so I used a middle of the road aperture.

Another from around the country house.  For some reason this tree decided to hang on to several apples but not its leaves.  A perfect candidate for a shallow depth of field (isolation aperture) photo.

ISO 200, f/3.5, 1/800 sec.

In this one I wanted to focus on one of the apples while having the others blurred but recognizable.  At 18 mm the largest aperture on my 18-200 mm lens is f/3.5 so I went with that and focused on the closest apple.  I didn’t nail the focus but  when shrunk for the web it still looks good.  The colourful apples contrasting with the dull tree and overcast sky are enough to make them stand out and they don’t all need to be in sharp focus.  In fact, if a deeper depth of field were used the contrast between the apples and the tree would not be as dramatic.

A wind blown tree near Nobleton, Ontario.  I seem to like pictures of lone trees.  It’s rare that you see one tree alone with almost nothing else around it.

ISO 800, f/8, 1/800 sec.

I was just taking pictures of the tree when the person and dog walked into the frame and I liked this one better than shots of the tree alone. There were no foreground or background elements so this is an ideal situation for a who cares aperture and a medium depth of field.

This one goes back to assignment 2.  We were out for a walk in the Stony Swamp area of the Ottawa greenbelt and about 5 minutes in we came across two deer munching on some bird feed.  I wasn’t really ready for it, but I did get a few shots.  I wish I was at a higher ISO so I could have shot at a faster shutter speed and eliminated some of the motion blur.  It was a fairly overcast day on top of being in a densely wooded area.

ISO 800, f/5.6, 1/160 sec.

This is the largest aperture for my 18-200 mm lens at this zoom level (200 mm).  I wish it was faster, but don’t we all.  The reason for using the largest aperture is twofold.  One reason is that it was not a well lit shot so using the widest available aperture permits a faster shutter shutter speed and the other has to do with the topic of assignment 2, it provides shallow depth of field.  I a densely wooded area there is a lot going on in the background and foreground and using a wide open aperture to get a shallow depth of field helps to isolate the main subject from the background trees and brush.

The new bridge at the Hoover Dam.  Opened to traffic the day we were there.  I really wish we had a chance to walk out onto the bridge.  I bet the view from there is amazing.

ISO 400, f/8, 1/200 sec.

The bridge and canyon here are so large that everything is essentially at an infinite focal distance and a who cares aperture applies.  An aperture of f/8 provided for a fast enough shutter speed on a gloomy day, but gives just enough depth of field.