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10 stop ND filter


paulcr Plus
16 1.5k 9 Ireland
12 Aug 2009 8:02PM
Hi guys. Can anyone recommend the best (by that I mean cheapest) place (online) to get a 10 stop ND filter, 77mm screw on?

Cheers
Paul
steviehutch 14 18 United Kingdom
12 Aug 2009 9:02PM
hi paul,bought mine from warehouse express approx 3 months ago,they were the cheapest at the time . i have just been on there site and have gone up by thirty pounds,obviously been a big demand lately, good luck steve
psiman 17 574 Wales
13 Aug 2009 7:39AM
Amazon have a B+W 77mm 10 stop (ND 3.0) in stock for 75. I bought a 67mm 10 Stop and 77mm 6 stop both for 54 each from them 2 days ago

Simon
Coleslaw 15 13.4k 28 Wales
13 Aug 2009 8:11AM
If you use square filter system, you can get a square one from Formatt for about 45.
paulcr Plus
16 1.5k 9 Ireland
14 Aug 2009 10:02AM
Thanks guys, checked those out. Thay all seem really expensive at the moment (for some reason, its only a filter) so I'll wait to see if a less expensive alternative becomes available at some time.
Cheers
Paul
ade_mcfade 17 15.2k 216 England
14 Aug 2009 10:42AM
could be interesting calculating the shutter speeds for these things.

I'm guessing this is the case...

if t = shutter speed and
tn = shutter speed at n stops

then

t1 = 2*t
t2 = 2*2*t
t3 = 2*2*2*t
tn = 2^n*t

so t10 = 1024*t

actually, not too bad with it being around a 1000 - if you were multiplying by 256, that'd be more interesting Wink
paulcr Plus
16 1.5k 9 Ireland
14 Aug 2009 3:46PM

Quote:Could be interesting calculating the shutter speeds for these things.

I'm guessing this is the case...

if t = shutter speed and
tn = shutter speed at n stops

then

t1 = 2*t
t2 = 2*2*t
t3 = 2*2*2*t
tn = 2^n*t

so t10 = 1024*t

actually, not too bad with it being around a 1000 - if you were multiplying by 256, that'd be more interesting



Ahem...yes of course. I knew that Smile

Paul
ade_mcfade 17 15.2k 216 England
14 Aug 2009 3:55PM
...I didn't till I worked it out earlier Wink

I've seen people blathering on about logartihms and stuff like that before when talking about ND's, but thought they were getting it a little wrong..

then again, we are talking in powers of 2 - so you "could" talk in logs, but no need - just remember

2
4
8
16
32
64
128
256
512
1024

and you can't go wrong Wink
paulcr Plus
16 1.5k 9 Ireland
17 Aug 2009 8:43AM
Will do, cheers Ade Smile
Paul
BigCol 20 1.8k 1 Scotland
3 Mar 2010 9:57AM
And if you have an iPhone there's an App for that!
The website's in German but the app is available in English. It even has a countdown facility for you!
NikLG 15 1.7k England
3 Mar 2010 1:33PM

Quote:
2
4
8
16
32
64
128
256
512
1024



That looks like the list of correct dimensions to use for texture maps when we make models for our games ( at work.. )....except for the 2 and 4...and sometimes 2048...
No contribution to the thread whatsoever, but I found it an interesting... Tongue
rhody 18 2.8k 2 United Kingdom
3 Mar 2010 2:11PM

Quote:Thanks guys, checked those out. Thay all seem really expensive at the moment (for some reason, its only a filter) so I'll wait to see if a less expensive alternative becomes available at some time.
Cheers
Paul



Hi Paul - it's a long shot and you may not be interested - but have you thought about trying a flat welding glass lens? The flat type used in welding helmets - not the goggles.

A flat 110mm x 90mm glass lens is less than 2 and will reduce light dramatically. They can be cut and adapted to fit Cokin mounts.

Five different shades are available. The darkest shade is 13EW - rated for up to 500 amps

Welding glass lenses

Even the high quality German glass lenses are a similar price.

It may not suit your needs - but if you want to play around at minimal cost you can't really go wrong with this type of glass at these prices.
digicammad 17 22.0k 40 United Kingdom
17 Aug 2011 3:07PM
The trick is fitting them to the front of the lens in a way which doesn't let in light.

One thing I have always wondered is whether cameras with mirror lock have a little catch to take the strain, to save the battery during long exposures? With a 10 stopper a shot which would have taken 5 seconds would need well over an hour, you wouldn't get many tries at that on a single charge.
digicammad 17 22.0k 40 United Kingdom
17 Aug 2011 3:18PM
How about this ?

I assume these are basically 2 polarising filters sandwiched together, with one which can be rotated to adjust the strength of the filter. If somebody knows can you confirm?

Ian
paulcr Plus
16 1.5k 9 Ireland
17 Aug 2011 6:10PM
Yep. Took This. And this with one.
Paul

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