Archive for the 'Technology' Category

DIY nodal slide: Perfect panoramas

I remember having to do a panorama in a high school photography class. Mine was of a tree line across a lake shot with a 50mm lens on my old Pentax ME Super. It looked ok. Most things lined up.

For fun, I tried another one. On the second one, the subject was much closer. When I started to line up the images, I realized it just wasn’t going to happen. Nothing lined up. At the time, I didn’t know why. Now I do.

Two words. Nodal point. Essentially, this is the point where the image inverts in the lens.

When doing a panorama, many people will try to put their camera on a tripod using the threaded mount on the bottom of the camera body. Unfortunately, that is not under the nodal point and will cause distortion between images and not allow perfect alignment. Perfect alignment comes from the camera’s rotational point happening directly below the nodal point of the lens.

For example, I used the mount on the bottom of my camera months ago while doing a panorama inside of a church. Most things lined up but some of the pew backs did not. It is especially noticeable on the back few pews on the left.

The interior of the new St. Anne Catholic Church is seen in this photo illustration showing approximately a 180-degree view. The image was composed from 24 separate photos. (C-T photo illustration Max Gersh) ©2010

The interior of the new St. Anne Catholic Church is seen in this photo illustration showing approximately a 180-degree view. The image was composed from 24 separate photos. (C-T photo illustration Max Gersh) ©2010

What the camera companies would like is for you to buy one of their multi-hundred dollar panoramic tripod heads. But if you’re like me and know what lens you will be using and want to save a ton of money, it is pretty easy to build one on the super cheap.

I started out by getting a piece of 1/8″ aluminum. I had this already but you can find it at any hardware store. A long rail of it is about $10. I did buy a few bolts and nuts to tighten things down (total of less than $1.50). I made sure every piece of hardware was 1/4″-20, the same thread as a standard camera mount.

I centered and drilled a 1/4″ hole at one end of the aluminum plate. Then I mounted my camera to it with one of the bolts I bought.

There are plenty of tests online to find your nodal point. I did pretty much the same thing as everyone else. I set up two objects in a direct line about a meter apart. The camera is straight in line with them as well. As you pan, the items will stay in line if the nodal point is correct. If not, the objects wont appear to be aligned unless you are looking straight on. This website has visuals of how it looks when the slide is correct, too far forward and too far backwards.

**UPDATE** I’ve been asked how I had the plate attached to the tripod to find the nodal point before I had any holes drilled for attachment. I simply used a spring clamp similar to this one. I would slide the plate and clamp it in place and do the panning test. I then would adjust and re-clamp and the do it again and again until I got it just right.

When I found the right point, I made a mark on the plate and drilled a hole there.

I put the tripod screw through that hole and used a hex nut to lock it down. Then, used a bolt and attached the camera.

I was building this for my Canon 1D Mark II with the 24-70 f/2.8 L lens zoomed at 24mm. If you’re trying to make this for the same setup, the center of the two holes on the slide are about 5.5″ apart.

Now, if you have a drill press or other fancy tools, you could actually make this a “slide” so you could adjust it on the fly for other focal lengths. If I wanted to do another focal length, I’d have to do the alignment test again and drill a new hole.

This is the DIY nodal point slide on the floor with the camera hole and tripod hole drilled. I marked which was which to avoid any confusion in the field. ©2010

This is the DIY nodal point slide on the floor with the camera hole and tripod hole drilled. I marked which was which and added an arrow to show the direction of the lens to avoid any confusion in the field. ©2010

Here is what my camera looks like on the rig.

My Canon EOS 1D Mark II with 24-70 f/2.8 L lens on a DIY nodal point slide to acheive accurate panoramas. ©2010

My Canon EOS 1D Mark II with 24-70 f/2.8 L lens on a DIY nodal point slide to achieve accurate panoramas. ©2010

Having the urge to do an immediate test, I ran outside of my apartment and took a quick panorama of the building.

A quick test panorama of my apartment building using my DIY nodal slide. This panorama is composed of 14 images. ©2010

A quick test panorama of my apartment building using my DIY nodal slide. This panorama is composed of 14 images. ©2010

Notice how all of the lines in the sidewalk and building line up perfectly. Also notice my lovely shadow.

If you try this on your own, keep in mind that these panoramas are cropped to cut out the dead space. Dead space happens around the edges on all panoramas in the gaps where you don’t photograph. Here is the above panorama of my apartment with the dead space left in.

A quick test panorama of my apartment building with the dead space left in. This panorama is composed of 14 images. ©2010

A quick test panorama of my apartment building with the dead space left in. This panorama is composed of 14 images. ©2010

After determining that my nodal slide was a success, I headed out to Memorial Park in New Castle, IN to make some more scenic panoramas.

One I did while out there was of my car. It has many things that have to line up. I figured that would be another good test to make sure everything lined up.

A panorama of my Subaru Forester in Memorial park. This was shot on my DIY nodal slide and consists of 18 images. ©2010

A panorama of my Subaru Forester in Memorial park. This was shot on my DIY nodal slide and consists of 18 images. ©2010

All of the lines matched up perfectly. It lined up so perfectly that you can’t really tell how close I was to the car while shooting. I couldn’t fit the entire car in a single frame with a 24mm lens. Just keep in mind that it took 18 images to compose the entire scene.

I then turned to the large pond. I walked down into a muddy area where it appeared the water had receded. To put this to the true test, I did a 360 degree panorama. Composed from 55 separate images, the full resolution of this image is unreal.

A 360 degree view in Memorial Park made from 55 separate images. Shot on my DIY nodal slide. ©2010

A 360 degree view in Memorial Park made from 55 separate images. Shot on my DIY nodal slide. ©2010

With the same set of images, I decided to see if I could form it into what is commonly known as a “wee planet” through a process called stereographic projection. Here is how it turned out.

A stereographic projection (wee planet) at Memorial Park. Shot on my DIY nodal slide and consists of 55 separate images. ©2010

A stereographic projection (wee planet) at Memorial Park. Shot on my DIY nodal slide and consists of 55 separate images. ©2010

I’d say $1.50 well spent and good use of some scrap metal.

The “Chris Lee button”

Let me start off by saying this is a techy and camera-specific post for shooters.

Chris Lee is an excellent sports photographer for the St. Louis Post-Dispatch. Apparently, he is also excellent at reading the owner’s manual to his Canon 1D.

Many professional photographers shoot their camera in a full manual mode to ensure they have the most control of the exposure. This works great until the subject you’re tracking runs into a shadow and your settings are now three stops off.

For years, I’ve just quickly spun my camera’s dials to compensate. But usually by then, the action is over or the exposure isn’t right on.

That was until I read about the “Chris Lee button.” What a wonderful discovery.

To get to the point, on the back of the Canon 1D series cameras (original & MarkII), there is a button third from the right at the top. Most shooters use the button with the asterisk ( * ) as the focus button. It is the one to the left of that. It is labeled WB, +/-, and an X-shaped box. That button can be programmed to switch camera modes while pressed.

For example, I could be shooting in manual when my subject runs into a shadow. I am already pressing the ( * ) button so I move my thumb left less than an inch onto the WB, +/-, X button. That switches my camera instantly into AV (aperture priority) mode and adjusts the shutter speed to match my preset f-stop setting.

With the press of one button, your camera will continue following focus and get an accurate exposure in AV mode. As soon as you release the button, it goes back to the manual settings you last had.

AMAZING.

So, how do you do it?

You must have a computer with the Canon Utilities program installed and the camera connected via Firewire. In that program, you can activate the personal functions of the camera.

  1. Enable personal function #6. This is the only step you have to do on the computer.
  2. Go to the personal functions menu on the camera and turn on #6.
  3. Set your desired exposure settings for when you hit the WB, +/-, X button. For me, that’s AV mode and f/2.8. The ISO wont change from manual your exposure.
  4. Press and hold the +/- (exposure compensation) button on the top of the camera next to the backlight button.
  5. Simultaneously press the WB, +/-, X button.
  6. Press the WB, +/-, X button to select.

This didn’t entirely make sense for me. That is because you have to make sure some other settings are in order.

If you have custom function #11 set to 2, then you have to press and hold the magnify/AF point select button and the WB, +/-, X button simultaneously.

You will also need custom function #18 set to 0.

When you do this properly, you will see a small square appear in the top right hand corner of the top LCD screen. You’re exposure settings have been saved to that button.

While this setting was discussed on SportsShooter a few years ago, I am just now coming across it. I find that many shooters don’t know their cameras have this setting.

Chris Lee revisited the topic recently when he got his 1D Mark IV. Apparently it is now a stand-alone custom function.

Thanks for sharing this Chris. It is a great tool to have a thumbs length away.

Always have your camera

Someone once said the camera that takes the best pictures is the one you have with you… or something like that.

I’ve never been one to carry a point-and-shoot camera. If I’m going to have a camera with me, I’d rather it be my beloved SLR. But let’s be real. It’s not always practical to carry around a big camera rig like that. My Canon 1D Mark II with a 24-70 f/2.8 L lens takes great pictures but it also takes a lot of space. If I’m out for dinner, I don’t really want to plop it down on the table during the meal.

As much as I would enjoy something like a Canon G11, I can’t personally justify owning one at $500. It will never be as good as my SLR.

Recently, I got a Droid Incredible cell phone. I decided I’d take more of those random photos that I’ve missed over the past few years. While it is no super camera, it is the best cell phone camera I have ever used. Eight megapixels packed into a sleek package.

Famous Daves BBQ in Louisville, KY. ©2010

Famous Dave's BBQ in Louisville, KY. ©2010

A light hanging over the sidewalk in downtown Louisville, KY. ©2010

A light hanging over the sidewalk in downtown Louisville, KY. ©2010

Besides using the regular camera app, I’ve been using the Retro Camera app that allows for some stylization that mimics a variety of cameras including a pin hole camera, Polaroid and a Holga. That has been yielding some great results.

One afternoon in Louisville, I laid out on my parent’s hammock snapping photo after photo. From my swaying comfort, I got photos of myself, the family dogs and any other random thing that looked interesting.

A camera-phone self portrait. ©2010

A camera-phone self portrait. ©2010

My parent's dog, Elsie. ©2010

My parent's dog, Elsie. ©2010

My parent's dog, Oliver. ©2010

My parent's dog, Oliver. ©2010

The phone also is handy for snapping random “artsy” photos around town.

Halftime at Papa John's Cardinal Stadium. ©2010

Halftime at Papa John's Cardinal Stadium. ©2010

A water tower in New Castle, Indiana. ©2010

A water tower in New Castle, Indiana. ©2010

At the end of the day, I would rather shoot these photos with one of my SLRs - my Canon 1D Mark II or Hasselblad 500 C/M. But I snapped these at the spur of the moment. Having a decent quality camera in my pocket provided me an opportunity to capture an image that I otherwise wouldn’t have.

Artificial multi-point lighting

If there was one valuable thing about photography that I learned in college, it was the science behind lighting.  Understanding the inverse square law and how multiple lights can affect an image proved to be invaluable to me.

While I was at the St. Louis Post-Dispatch, I had an editor give me the idea of shooting a food set with multi-point lighting. The basic multi-point setup includes three lights. One each to the left and right and one from behind. The problem is I only have one light - my Canon 550EX Speedlight.

While I was realizing how impossible this was with my gear, my editor opened my eyes. Why not set the camera on a tripod and shoot a long exposure. During that time, I can walk around with my flash off of the camera and fire it manually multiple times from multiple angles.

Voila. Max’s quick and easy multi-point lighting was born.

The one problem with it is that it is very hard to replicate an image. You can never get the light exactly where it was before. This is one of those situations where you shoot a lot with a general idea and hope for the best.

The first time I attempted and accomplished this technique was exactly one year ago on location at a Brazilian restaurant in the Central West End of St. Louis called Coco Louco Brasil.

Monday February 16, 2009 Coco Louco Brasil Foreground: Espeto Misto - kabob with pricanah (brazilian steak), smoked sausage, shrimp, filet mignon wrapped in bacon, chicken wrapped in bacon, onions Background: Tostada de Camarão - shrimp sauteed in Bobo sauce served on toasted garlic bread. Max Gersh | Post-Dispatch

Monday February 16, 2009 Coco Louco Brasil Foreground: Espeto Misto - kabob with pricanah (brazilian steak), smoked sausage, shrimp, filet mignon wrapped in bacon, chicken wrapped in bacon, onions Background: Tostada de Camarão - shrimp sauteed in Bobo sauce served on toasted garlic bread. Max Gersh | Post-Dispatch ©2009

For that shot, the camera was set for a four second exposure at f/16 and ISO 100. If I remember accurately, I fired the flash three to four times.

Coincidentally, I used the same technique today.

I was given the last minute assignment to shoot a group of local high school wrestlers that have advanced to the state championships. I wanted to isolate them in the image. I turned off all of the lights in the room and fired the flash twice - once from each side.

New Castle wrestlers (left to right) Connor Mullins, Brenden Campbell, Alex Catron and Cody Fellers will compete Friday and possibly Saturday in the Indiana High School Athletic Association state championships. (C-T photo Max Gersh) ©2010

New Castle wrestlers (left to right) Connor Mullins, Brenden Campbell, Alex Catron and Cody Fellers will compete Friday and possibly Saturday in the Indiana High School Athletic Association state championships. (C-T photo Max Gersh) ©2010

This time, the camera was set to a two second exposure at f/8 and ISO 400. I also was using the Gary Fong PowerSnoot on my flash.

With one light and forward thinking, any image is possible.

Cell phones are everywhere

Cell phones are everywhere. Most people have one. Many people have more than one. It should come as no surprise to me for people to be using their phones in my pictures.

As a society, we are now used to seeing citizens take out their phones to snap pictures at the passing by celebrity or even from the upper deck at a sporting event. National Geographic even published a book on how to optimize your cell phone photography.

Wednesday, November 19, 2008 Fans embrace Will Smith as he exits the St. Louis Post-Dispatch building Wednesday afternoon. Max Gersh | Post-Dispatch ©2008

Wednesday, November 19, 2008 Fans embrace Will Smith as he exits the St. Louis Post-Dispatch building Wednesday afternoon. One fan in the lower section of this image can be seen photographing Smith with a cell phone. Max Gersh | Post-Dispatch ©2008

But is it always appropriate to be on your phone? Does it sometimes go beyond what social etiquette deems acceptable?

I want to say upfront that I pass no judgment on the people in these photos. I have no idea what is considered acceptable in their fields. These images just struck me as peculiar.

This first photo is from St. Louis on the Martin Luther King Bridge. There was a fatal car accident. I was shooting from the MetroLink station in Illinois just south of the bridge.

The police officer in the photo had already taken what I presume were the official photos of the scene with a DSLR. Then, it appeared as if he were taking shots of the wreckage with his cell phone.

Friday, December 5, 2008 A police officer holds up his cell phone at the scene on an early-morning fatal accident that blocked all traffic on the Martin Luther King bridge.  Max Gersh | Post-Dispatch ©2008

Friday, December 5, 2008 A police officer holds up his cell phone at the scene on an early-morning fatal accident that blocked all traffic on the Martin Luther King bridge. Max Gersh | Post-Dispatch ©2008

Today while photographing a meeting of the New Castle/Henry County Economic Development Corp. (EDC), one of the panel members seemed to have trouble staying off of his phone.

Scott Hayes, right, a New Castle-Henry County Economic Development Corp. board member, talks on Monday about problems the EDC has with a proposal for an economic development alliance while County Commissioners Kim Cronk and Bill Cronk listen. (C-T photo Max Gersh)

Scott Hayes, right, a New Castle-Henry County Economic Development Corp. board member, talks on Monday about problems the EDC has with a proposal for an economic development alliance while County Commissioners Kim Cronk and Bill Cronk listen. (C-T photo Max Gersh) ©2010

These photos have no significant meaning other than the included cell phone usage caught me off  guard.

Again I want to stress that I pass no judgment on the people in these photos. I don’t know if there was something of the utmost importance that couldn’t wait. I just felt like sharing these images to see if anyone else had to think twice about the situation.




This site is protected by WP-CopyRightPro