Thread: using ND Filter

1. using ND Filter

Hi,

In order to syn the flash and use a bigger aperture on bright backgnd,
is it a feasible idea to use ND filter ?

Tks

2. Re: using ND Filter

Yes and its quite a common solution as well. Depending on whether you're using the flash as a fill flash for your subject, your background may be underexposed.

Your other option is high speed sync.

3. Re: using ND Filter

Originally Posted by redwine
Hi,

In order to syn the flash and use a bigger aperture on bright backgnd,
is it a feasible idea to use ND filter ?

Tks
why not.. a CPL can also do it

4. Re: using ND Filter

Thanks Guys ...i suppose

Btw,
For taking slow shots of waterfall etc on bright day,
is ND8 or ND400 is more suitable ?

I suppose ND8=3 stop and ND400=9 stop.
Pls correct me if wrong.

Thanks.

5. Re: using ND Filter

Originally Posted by redwine
Thanks Guys ...i suppose

Btw,
For taking slow shots of waterfall etc on bright day,
is ND8 or ND400 is more suitable ?

I suppose ND8=3 stop and ND400=9 stop.
Pls correct me if wrong.

Thanks.
ND400 is actually around 8.6~8.7 stops, but 9 stop is close enough I suppose.

To get the approximate shutter time, just take X from NDX and multiply your shutter time. For example, a 1/200s shot will take 1/200 * 400 = 2s with a ND400 on. That sounds about right to smooth a waterfall. On the other hand, 1/200 * 8 is not quite enough

6. Re: using ND Filter

Originally Posted by sabee
ND400 is actually around 8.6~8.7 stops, but 9 stop is close enough I suppose.

To get the approximate shutter time, just take X from NDX and multiply your shutter time. For example, a 1/200s shot will take 1/200 * 400 = 2s with a ND400 on. That sounds about right to smooth a waterfall. On the other hand, 1/200 * 8 is not quite enough
Thanks Sabee, great tips.

7. Re: using ND Filter

Hi,

2 more questions,

how many stop is ND110 filter ?
Is it necessary to pre-focus before putting on the ND filter such as ND400 ?

Thanks

8. Re: using ND Filter

Originally Posted by redwine
Hi,

2 more questions,

how many stop is ND110 filter ?
Is it necessary to pre-focus before putting on the ND filter such as ND400 ?

Thanks
Yes, you should pre-focus before using high stop ND filters. Generally for landscape, using the hyperfocal length suffices: http://en.wikipedia.org/wiki/Hyperfocal_distance

The B+W 110 is not actually ND110, its more like ND1000 (10 stop). 110 is just some model number B+W uses.

9. Re: using ND Filter

Originally Posted by redwine
Hi,

2 more questions,

how many stop is ND110 filter ?
Is it necessary to pre-focus before putting on the ND filter such as ND400 ?

Thanks
Yes, u have to..i barely see **** when i put on my ND400, much less to compose and prefocus..

10. Re: using ND Filter

Thanks Sabee & Numnumball,

That's clear
Guess i will need a ND8 & ND400.

11. Re: using ND Filter

Originally Posted by redwine
Hi,

2 more questions,

how many stop is ND110 filter ?
Is it necessary to pre-focus before putting on the ND filter such as ND400 ?

Thanks
stated 10, but actually i think closer to 10.5-11.

anyways, yes, your camera cannot AF also.

12. Re: using ND Filter

Originally Posted by redwine
Hi,

2 more questions,

how many stop is ND110 filter ?
Is it necessary to pre-focus before putting on the ND filter such as ND400 ?

Thanks
Supposed to be 10 stops. It doesn't use the standard naming convention naming but makes it easier to count the stops. Just subtract 100.

B+W's ND 103 is 3 stops, ND 104 is 4 stops, ND 110 is 10 stops.

I prefer the standard way, i.e. ND8 is 8 attenuation factor (3 stops). That way I can use time multiplier. If a normal photo without ND will take in 1sec, then with the ND8 it should be exposed for 8 secs (1x8secs). Thus for ND400, for what would be a 1sec shot, with the ND, it would be 1secx400 = 400sec = 6mins 40secs.

13. Re: using ND Filter

Thanks for the info

Btw,
Beside 77mm, is there any 82mm ND400 filters ?
I just want to buy the biggest and use step-up ring,
dont want to end up with multiple sizes.

Tks.

14. Re: using ND Filter

http://www.clubsnap.com/forums/forumdisplay.php?f=84

82mm err... what lens you using arh?

15. Re: using ND Filter

Originally Posted by wildcat
http://www.clubsnap.com/forums/forumdisplay.php?f=84

82mm err... what lens you using arh?
maybe he's planning for the sigma 8-16, which is SUPPOSED to be 82mm filter size, though i can't see how.

16. Re: using ND Filter

8-16mm surely sounds very appetizing

Not sure anyone done this,
If you have a 82mm and caught in a situation where you only have a 82-77 stepdown + filter,
how much would you lost when you crop off the vignette ?
Easily 20% i guess.

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