EX1 Lens Protection?

[John Woo]

http://www.adorama.com/BW77CM.html

I am using the B+W clear glass filter on my EX1. UV filter will reduce about 10% light entering your lens. This info was from a photographer friend

[Jonathan Bland]

Perhaps our friend Ryan Avary would care to comment on the 10% light loss.....?

[Paul Chiu]

pretty certain that 10% number is way off.
even 1% for a schott glass filter is high.

as of which filter, jonathan, i was down this road last month as i did not want a filter on mine either.
so i bought 3 of the more expensive schott glass filters available, mounted each on a sturdy tripod and did some indoor and outdoor testing. spent some hours testing it and decided to stay with this one.

http://www.bhphotovideo.com/c/produc..._Haze_010.html

mostly because of the slimness of this model. solid brass ring and thinner than even the thinnest pro hoya mount. the visible difference between this model and the clear scheider model even at 200% under photoshop was minor. for samples both outdoors and indoors.

i grabbed some un-edited videos i took recently for you to examine.
one was with side light and normal to short telephoto
one was with the sun in the back and to the side
one was indoors

1st 2 grabs using quicktime and mac os' "grab" function
last boy grab using vlc screen capture, a much smaller file.

handheld with steadyshot on.



all 3 with the slim b+w uv i noted above.

paul

Originally Posted by Jonathan Bland

Perhaps our friend Ryan Avary would care to comment on the 10% light loss.....?

[Jonathan Bland]

Very nice work Paul. I always appreciate the level of your findings :)
Gotta run now.......

[John Woo]

Originally Posted by Jonathan Bland

Perhaps our friend Ryan Avary would care to comment on the 10% light loss.....?

B+W 77mm UV Haze 010 Glass Filter Slim

Can anyone of you please tell me what does the 010 in the above filter definition means?

[Gabriel Florit]

Originally Posted by John Woo

B+W 77mm UV Haze 010 Glass Filter Slim

Can anyone of you please tell me what does the 010 in the above filter definition means?

I think it's the width in millimeters.

[Paul Chiu]

hey J,

the entire video portion of my recent sample using DIVX 1080HD compression.
very nice, down to 421mb for 9.5 minutes.
perfect to place onto VIMEO.com

http://www.vimeo.com/1248363

if you have the time, download the 421mb file and the resolution is amazing even with the DIVX.

and N.B. B+W slim MRC coated UV filter used on this shoot......

paul

Originally Posted by Jonathan Bland

Very nice work Paul. I always appreciate the level of your findings :)
Gotta run now.......

[Ryan Avery]

Originally Posted by Jonathan Bland

Ok......

The new 77mm B&W UV (MRC) filter arrived........

Has anyone else noticed that this filter seems to look as though it is covered with a salty film that will not wipe off?

Maybe it is just the the way this filter is manufactured...... or could it be that I got someone's old returned one that has been put through a major sand/ salt storm?

Can someone please take a good close look at theirs :)

I would return the filter to whoever you bought it from. Sometimes there is a slight "film" from the manufacturing process but that should clean right off with some good quality lens cleaning solution and a microfiber cloth.

Ryan Avery
Schneider Optics

[Ryan Avery]

Originally Posted by John Woo

B+W 77mm UV Haze 010 Glass Filter Slim

Can anyone of you please tell me what does the 010 in the above filter definition means?

The 010 refers to the level of UV filtration. Different UV filters cut off different amounts of UV light. 017 UV filters were once popular for aircraft or high altitude shooting because they cut much more UV light that film was sensitive to. We don't use much film anymore so the standard 010 is just fine because digital sensors aren't sensitive to UV light like film is.

Ryan Avery
Schneider Optics

[Ryan Avery]

Originally Posted by John Woo

http://www.adorama.com/BW77CM.html

I am using the B+W clear glass filter on my EX1. UV filter will reduce about 10% light entering your lens. This info was from a photographer friend

Your friend is mistaken. Optics seem to be one of the more difficult subjects to get your head around so I don't blame him.

Having said that, the amount of light reflected can be up to 10% with certain low-cost UV filters. 10% light reflectance is roughly equivalent to 1/5 of an f-stop. We refer to the light transmission number as the other side of the equation; 90% light transmission in this case.

B+W MRC filters feature 99.8% light transmission. This means that the amount of light reflected is about 2/100 of an f-stop.

Basically, no matter which way you go, you will be losing a neglible amount of light that should have no noticeable net effect on your exposure. What a poor quality filter will do is have a very negative effect on the quality of your image in terms of resolution, flare, and chromatic abberation.

Ryan Avery
Schneider Optics