Hacking Photography - one Picture at a time
Cross polarization is a technique that uses two polarizing filters – one on the light source and on e on the camera lens – to get rid of unwanted specular reflections.
The following slideshow illustrates the effect at varying degrees, depending on the orientation of the filters with respect to each other.
I’m a big fan of step-up rings. I buy all my circular filters in 77mm diameter (the largest diameter of all the lenses I own) and then use step-up rings to be able to use them on lenses with a smaller diameter. It’s a great approach that saves you an absolute fortune because you don’t have to buy your polarizers and variable NDs in five different sizes. You buy the largest size you need and then spend $1-2 each on step-up rings.
But this new device, the REVORING looks like it wants to be the only step up ring you’ll ever need. It’s currently launching on Kickstarter, where it’s already more than quadrupled its goal, and it’s a pretty interesting concept. Although, it’s not going to be ideal for everybody just yet.
When it comes to shooting photos or video on drones, it quickly becomes apparent that filters are key to getting the best footage. And the first name that springs to mind for drone filters is PolarPro. They’ve pretty much been the leading company for drone camera filters since they started taking to the air.
Today, though, PolarPro announce that they’re expanding their range to include larger lenses for DSLRs, mirrorless and cinema cameras with the new QuartzLine series of filters. It looks like their whole range for drones has been scaled up to fit the larger lenses in a variety of sizes.
If you’re flying a drone and want professional photos and video you need a set of polarizing and neutral density filters.
I have been using a set of Polar Pro filters on my Mavic for some time now, so I thought I would spotlight why I use polarizing and neutral density filters on my drone and some thoughts on the Polar Pro filters that I use.
Filters have largely gone the way of the dinosaur with digital photography. Lens filters, that is. The simple fact of the matter is that they’re just not needed now. We used to need a whole array of filters when we shot film. Solid colours to shift the contrast on black & white film. Variously coloured graduated filters to shift skies warmer. Now, you can do all that in post.
Colour shifts and gradients are pretty straightforward in Lightroom or Photoshop. But one filter that’s still essential is a circular polarising filter. It allows you to do things that are simply impossible in post, even with today’s digital technology. This video from photographer Christopher Frost explains why, with some practical examples.
Polarized light is light that has waves oscillating all in the same direction. There are two basic ways to get polarized light, from reflection or by using a filter. When light reflects off water or any other flat surface the light becomes polarized in one direction. It is common for fishermen to used polarized glasses to block the reflected polarized light (which causes glare) so they can see below the water better. The second and most common way to produce polarized light is with a polarizing filter. Polarizing filters were invented by Edwin H. Land in the 1930’s. Land developed an inexpensive process to align polarizing crystals and fix them into position with a binder. This polarizing filter became the standard for photographic and industrial processes.
Polarizing filters are great, they enhance skies, remove reflections and reduce glare from photos. On the other hand they are usually big and not something you’d haul around for a smartphone. Here is a quick little hack courtesy of the Koldunov Brothers that builds a small and portable polarizer filter for your smart phone.
Circular polarizing (CPL) filters are one of the most useful tools a landscape photographer can have in their toolkit, and in this video from landscape and nature photographer Joshua Cripps, you’re going to find out why.
Of course, they’re not limited to just landscapes, they can also help to cut through reflections and glare on glass and other reflective surfaces, so they can also be great for street, automotive and even portrait photography.
Breakthrough Photography has already had their, well, breakthrough, but they’re looking to push the boundaries even further.
On December 14th 2014 the San Francisco-based startup finished a very successful Kickstarter campaign for their then-new collection of neutral density and circular polarizer filters. Now, they’re improving their offerings with a new circular polarizer filter that they claim to be the ‘world’s sharpest and most color neutral.’[Read More…]
Did you know that that when you use a polarizer in a wet forest, the color come out more vibrant because of the water’s effect through the lens?
Up until today, the only two things I knew about polarizers were that they make things go black when you put two together, and that they’re a feature in my American Optical Pilot Aviators (insanely affordable for their quality). Photographer Steve Perry, however, is so passionate about the polarizer that he made a ten minute long video tutorial over it. And don’t let that throw you off; this video doesn’t waste time. He spends ten straight minutes teaching you about polarizers, and it’s one of the most informative little pieces I’ve seen for a while now.
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