the blog of Seldom Seen Photography

Archive for February, 2012

Perspective on Reality

Tacoma Pilings

Tacoma PilingsI recently read a blog post by Tim Grey on photographic perspective. In it, Tim Grey asks his readers:

Is it ever ‘wrong’ to present an image as ‘real’ if we’ve used a bit of perspective to create a scene that isn’t exactly representative of reality? Creating tricks of perspective can be done very easily by changing your position relative to the subject or changing lenses on the camera. Is that wrong?

In response, I commented:

“I don’t believe it is wrong to present something as ‘real’ just because of the perspective. Perspective has been an important part of photography as long there has been cameras. Am I suppose to label every image taken with a telephoto lens as ‘this image may not represent reality as you experience it if you visit this location?’

I love taking telephoto shots of Mount Rainier, such as the one shown here [my original response included a link to the the image shown below]. When showing images like this, many people comment on how it can’t be “real”, the mountain is not that close. But this is what the camera sees. It’s the same as the human eye sees at the same location, it’s just that the human eye also takes in a much broader view, so the isolate perspective is not realized. If you use binoculars from the same vantage point, you would get essentially the same view. Is the view from binoculars not ‘real’?”

I thought I’d explore this a bit further in this post. The image above and the image below, both of which show Mount Rainier, but with differing perspectives, where both taken from the spot just 4 minutes apart. The one above (which is actually a HDR image with 3 exposures) was captured with a setting of 24 mm (38 mm equivalent) on my 24-70 mm lens, and thus represents slight wide-angle view. The one below was taken with a setting of 175 mm (280 mm equivalent) on my 70 to 200 mm lens, and represents a telephoto view.

It’s images like the one below that get comments about not being real (I’ve been asked more than once if I’ve photoshopped the mountain in). It is easily shown that the image below is real, with no Photoshop trickery (at least if you believe the upper photo is “real”). If I crop the upper photo to the same field of view as the second photo (as shown in the third photo), the compressional distortion is the same, and the photos look very similar (except of course for the quality on the extremely cropped version). FYI – the pier in front of the buildings on the photo below is Les Davis Pier, featured in my last post on night photography.

I love to play with perspective distortion in my images, using various focal lengths  and camera to subject distances to expand (with wide-angle shots) or compress (with telephoto shots). There is a good explanation of the phenomena on Wikipedia.

Since Tim Grey inspired this post, I might as well put in a plug for him. Tim teaches about digital photography and imaging. He provides an excellent, free daily email service that provides answers to digital photography questions – often involving processing with Photoshop or Lightroom. I’ve gotten is daily email for years, and can highly recommend it.

Tahoma over Tacoma

Telephoto compression - taken from the same spot as the photo above, but with a telephoto lens instead of a wide angle one.

Crop of Tacoma Pilings

Extreme crop of the featured image showing telephoto compression by cropping field of view rather than using a telephoto lens. The image quality is poor due to the extreme cropping.

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Night Moves – Correct Exposure for Night Photography

Squid Fishers

Squid fishermen on Les Davis Pier - 4 minutes at f/8

“Workin’ on mysteries without any clues, Workin’ on our night moves” -Bob Seger, Night Moves

Last Tuesday, I spent a few hours working on some night photography down on the Ruston Way waterfront with a small group from the Mountaineers. We got quite a few questions about what we were doing down there with cameras and tripods at night. I guess we should have told them we were working on our night moves. But unlike the Bob Seger song, we were working in winter instead of summer. Winter is a great time for night photography because the night comes early, and you can still get home at a decent hour. Of course, it has disadvantages too, like the weather. Though not extremely cold, only about 40° F (about 4° C), it does get chilly standing around waiting on those long exposures.

Fireboat

Fireboat - 25 seconds at f/8

I’m really starting to enjoy doing night photography. The camera picks up lots of color and detail that the eye cannot see. I recently read Night Photography, Finding Your Way in the Dark by Lance Keimig, and I have a long way to go before ever approaching his abilities. But I have fun. I highly  recommend Keimig’s book to anyone wanting to learn more about night photography, it has lots of good information.

One of the great mysteries of night photography is getting the correct exposure without excessive noise. Digital noise is the bane of many a night photographer. Noise increases with long exposures, high ISOs, and underexposed shots. That’s why, with night photography, you should still use low ISOs and exposure for the right side of the histogram (while not allowing any important highlight to be blown out). Shooting this way, will help minimize noise, but will lead to long (or very long) exposure times, very often over 30 seconds (the longest programmed shutter speed on most cameras). Therefore, to get the correct exposure, you will often be shooting in manual mode with the shutter speed set to bulb. Knowing how long to leave the shutter open is a difficult question. It’s a real pain to wait through a 2-minute exposure only to discover when looking at the results that it should have been a 4- or 8-minute exposure.

Here’s one tip I found very useful from Keimig’s book. Set the camera to a very high ISO and take a test shot first. This can be used to check both composition (it’s sometimes hard to compose through the viewfinder in the dark) and exposure. To make the exposure math easy, Keimig presents a chart in his book and on his Nightskye website. Basically, for cameras with a native ISO of 100 (Canon cameras for example), set the ISO to 6,400 and take one or more test shots to find the correct exposure. The number of seconds in the correct exposure at ISO 6,400, is the number of minutes for the correct exposure at ISO 100. For cameras with a native ISO of 200 (like most Nikons), the test shot  ISO should be set to 12,800 and the normal shot  ISO at 200. (If your camera doesn’t have such high settings, his chart shows how to compensate).  For example, I use a Canon camera. So for the featured photo above, I took a test shot at ISO 6,400 and found the correct exposure was 4 seconds. I switched the camera to ISO 100 and re-shot with an exposure of 4 minutes (in both cases, of course, using the same aperture, f/8 in this case). Much easier than guessing on the correct exposure.

Thanks to Lance Keimig, I’ve solved one the mysteries of my night moves!

NIght on the Pier

Les Davis Pier - HDR image, 4 exposures at 2, 8, 30, and 120 seconds at f/8

Nozzles

Fireboat detail - 2.5 minutes at f/8

Les Davis Pier

Les Davis Pier - 32 seconds at f/8

Swarm

Light Swarm - waving a LED flash light on the pier (as you can see, my technique needs improving) - 1 minute at f/8


Gray Day at Grayland

Waves on the JettyBad weather can often make for good photographs, or so I’ve often read. However, sometimes bad weather is just bad. Such was the case last Wednesday. I scheduled the day off from my day job to do some photography. Wednesday morning didn’t look too bad when I got up, but by the time Tanya and I had the dog and cameras packed up in the car it was raining. Remembering that bad weather sometimes makes for good photography, I wasn’t too worried about coming home skunked.

We drove south and west to go the beach at Westport and Grayland. Though the sun started peeking through the clouds early in the drive, by the time we reached Aberdeen, there was a constant mist falling and the sky was a blank, gray sheet. We stopped at the Johns River Wildlife Area to let the dog out. Luckily, the mist had stopped falling, and I was able to take a few photos. After an hour or so, we continued on to Westport. We drove down to the marina, and the mist started up again, now accompanied by wind. I walked a bit on the docks, but took few pictures – it was pretty miserable out.

We then drove over to the beach by the jetty, and the mist let up again. However, the sky was still a blank slate and the wind was strong. We walked on the beach some, and I took a few more photos. Normally in situations like this, where the sky is so lifeless in photos, I try to concentrate more on taking detail shots – like of beach rocks, patterns in the sand, etc. However, the wind was causing me problems, shaking the tripod. And the clouds were so thick, it was dark, requiring long shutter speeds.

Later we drove down to Tokeland and then back up to Grayland for another walk on the beach, this time back in the mist.  We ended the day having a picnic dinner, with a bottle of red from the Westport Winery, in the car facing the waves of the Pacific. There was no sunset, just a slow fading of what little light there was.

Overall, it was a great day. How can being on the beach with wife and dog not be? Just not a good day for photography.

Johns River Field

Wet field at Johns River Wildlife Area

Westport Docks

On the docks at Westport

Beach Scene

Beach detail at Westhaven State Park, Westport

Johns River Trees

Bare, lichen covered trees at Johns River

Beach Sign

Looks like they remembered the sign but forgot the road!


5 Years Ago – Bear Necessities

I had hoped to offer some new images this week. I took Monday off from my day job to go do some photography. But instead, I ended up cutting a hole in my bathroom ceiling to evict a pregnant squirrel from my attic. The squirrel is gone, the hole remains, and still have no new images to show (and yes, I do feel bad for the squirrel, I hope she found a new home). So once again I reach into the archives.

Five years ago this month, my family took a trip to the Northwest Trek Wildlife Park just south of Tacoma. It was a family outing to show our Chinese exchange student some of the native wildlife of the Pacific Northwest, so I didn’t do a lot of photography, but of course I took the camera along.

I spent a about 15 minutes with a grizzly. Most of the time, it appeared to be asleep, but it did stir for a couple of minutes, which is when I took this series of pictures. I probably would have spent more time there, but the family beckoned.

Northwest Trek is a great place to take some wildlife images. They have a tram ride through a free-roaming area (which the bears are not part of) that can lead to some great images. Occasionally they have special photographer trips on the trams, which occur earlier in the morning and make more stops. Groups of photographers can even arrange for these special tours. I went on one back in my film days with the Pacific Northwest Nature Photographers and would like to go again some day.

When out at Northwest Trek or wherever your photographic adventures might take you,  remember it sometimes helps to keep thing simple and look for the bare necessities in your compositions!

“Look for the bare necessities, The simple bare necessities, Forget about your worries and your strife”  – from the Bare Necessities by Terry Gilkyson from the Disney film The Jungle Book