So Cal So Cal

Continuing my filter research. I see many different sizes available in terms of holders and their appropriate filters: 100x150, 6x4, 150x170...What's that all mean? Or more accurately, why would one want any given size over another?

Puckman wrote in post #16451298
Continuing my filter research. I see many different sizes available in terms of holders and their appropriate filters: 100x150, 6x4, 150x170...What's that all mean? Or more accurately, why would one want any given size over another?

If dimensions aren't equal the smaller one is for what size holder it goes in. The larger the the holder the wider lens it can be used on and/or more filters can be stacked. Some have the size listed in mm others in inch (100x150 is the same as 4x6). The larger dimension lets you slide the filter farther, as I mentioned earlier if you get a 100x150 GND you can slide it down far enough that it will act like a ND(it may still have a slight bit of graduation but very little) but a 100x125 GND can't be slid as far so you'd have a lot more graduation left in the frame when slide as far as you can go, or when using a reverse/hard edge GND the longer filter will let put the edge anyplace in the frame while a shorter one would keep you closer to the rule of thirds.

150mm holders are needed for lenses with bulbous front elements like 14mm and 17 TS-E and let you stack more filters on something like a 16-35 than the 100mm. Basically the size has to do with what focal lengths they filters can be used on, but in some cases the physical size of the lens could dictate what size holder is needed.

Very helpful! Thanks!

puckman, I'm cheap with filters, so I only use screw on types. I only have 3 and 10 stop nd's. I use software to merge if needed.

I'm considering that as well.
Although w 3 different thread sizes that means 3 of each filter as well. LOL.

40D + 400 F2.8L MKII + 1.4xII <----

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You could always buy the larges size needed and use set down(or is it up) rings.

If you want to use GNDs screw on filters will limit you on composition. Also screw on filters are more limiting on stacking, you'd need to use 120mm threaded filters in order to stack on wide angle lenses and those cost even more than the square filters.

lovemyram4x4 wrote in post #16451788
You could always buy the larges size needed and use set down(or is it up) rings.

If you want to use GNDs screw on filters will limit you on composition. Also screw on filters are more limiting on stacking, you'd need to use 120mm threaded filters in order to stack on wide angle lenses and those cost even more than the square filters.

Again, good points. Thanks. I think I'll just end up going for the Lee system once I've gotten the 6D and figured out which filters I need exactly.

Playing with flash/strobes tonight.

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I like playing with strobes myself

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I miss playing with mine.

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Zerimar wrote in post #16452995
I like playing with strobes myself

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Christina Kartchner by RickrPhoto, on Flickr

I think I like your model better than mine.