TRhoads wrote in post #17546075
This is what I carry my kit in, it holds the holder and rings, as well as the 3 square filters and the 3 4x6 grads, in my camera bag it takes up the space that a body takes up. Roughly 3x5x7 inches (14x8x20cm) I have two...one waiting on the Formatt system if it ever shows up! And when I said bulky, its because that case is bigger than the little cases for screw on filters, but its not heavy by any means...the weight those items adds to the bag is negligible. http://www.bhphotovideo.com …&InitialSearch=yes&sts=pi
The problem I have with screw on filters...even in bright daylight, it can be hard to see through them on Live View, and impossible through the viewfinder, particularly with a 10 stop. So you get your shot all set, focuses perfectly, composed just so...then go to screw on a filter and you move the focus or zoom ring...and you have to start all over...
Couldn't agree with you more on the square filters and how easy they are to attach & remove, especially when confronted with difficult shooting situations or where the light is changing quickly. Sometimes screw-on filters can waste time and in the process lose a shot.
But the downside to the square filters from an image quality perspective is simple: they lack critical sharpness at wide focal lengths on full-frame setups, especially on larger megapixel sensors.
Even though the Lee Big Stopper is incredibly blue, lacks MRC and has no nano coatings, the extreme dropoff in critical sharpness is not due to the glass being poorly made (not sure what glass they use, it's not stated), but rather light being bent at a right angle upon entry into the lens barrel at a fair distance away from the front lens element. Glass thickness, distance from front lens element and it being flat are all factors where smaller numbers equal sharper performance.
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For this reason circular filters resolve much sharper than square ones, even if the glass quality is identical. The above was shot on a Sony A7R, but just imagine what the 5DS R would do under the same circumstances.
We'll likely produce square ND filters with AGC (Japan) and SCHOTT B270 (Germany) variations with MRC8/MRC16 and nano coatings, but despite glass with higher purity and other stuff our critical sharpness on the corners for square will suck just as bad as the other guys when compared to circular NDs.