Author Topic: ND filters  (Read 3184 times)

G1ZmO

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ND filters
« on: August 27, 2013, 09:45:12 PM »
Advice about ND filters if you please?

I tried the ND filters I have when on holiday but had to use all 3 to get the image dark enough to allow a 2 second exposure at f22 ISO100 and then I ended up with a very pink image with the corners cut off by the stacked circular filters

So, questions:
  • Is the 'pink' image normal or is it just due to cheap filters?
  • Are there other relatively cheap filters which are worth buying?
  • Are the slot-in rectangular filters worth buying?
  • What would be the most recommended ND numbers to get for the likes of a 1sec exposure on a bright day?

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« Last Edit: August 27, 2013, 09:46:50 PM by G1ZmO »
Paul

Mike

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Re: ND filters
« Reply #1 on: August 27, 2013, 10:33:34 PM »
I use Hitech graduated filters and they are excellent:

http://www.teamworkphoto.com/hitech-grad-filters-c-78_1115_768_271.html

It gives 1, 2 and 3 stops of reduction.

They also do straight NDs

http://www.teamworkphoto.com/hitech-neutral-density-three-filter-p-10427.html

The filters are excellent (hard to differentiate from Lee filters).

I would advise getting the Lee filter holder though (they fit it exactly) as the Hitech filter holder isn't as good IMHO.
Rgds,  Mike

Mike

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Re: ND filters
« Reply #2 on: August 27, 2013, 10:45:07 PM »
I think the pink may be to do with the filters as I don't get that with the Hitechs.

From memory, using the sunny 16 rule, a sunny day at ISO 100 is 1/100sec at f/16, which is round about EV15.

1 sec at f/16 is about EV8 so you need to block about 7 stops of light that would be 2 x 0.6 filters and a 0.9 filter (0.6 is 2 stops and 0.9 is 3 stops)

If I've screwed up the maths then sorry.

Edit:  You could always stack the 0.3, 0.6 and 0.9 to give 6 stops and then play with the exposure a bit.

PS If you do decide to buy them I can sell you a Hitech filter holder cheap ;)
« Last Edit: August 28, 2013, 05:28:13 PM by Mike »
Rgds,  Mike

Mike

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Re: ND filters
« Reply #3 on: August 29, 2013, 10:29:25 PM »
that info any use or....
Rgds,  Mike

G1ZmO

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Re: ND filters
« Reply #4 on: August 29, 2013, 10:39:48 PM »
Sorry Mike I didn't see your replies until now. Great info, thanks. I kinda thought that the pinkness was due to the quality of the filters so I think I'll have to invest in some better ones but not for a while.
We've had quite a run of failures at home which is swallowing my budget lol. Shower went on the blink, central heating too, microwave blew up, washing machine sprung a leak this morning then the glass door of the oven shattered tonight! Bonkers!

Thanks again for the info and I'll have a think about the filter holder if I can minimise our repairs expenditure lol

Cheers

Paul

P.s. I also need to try to read up on all those calculations you mentioned. Didn't occur to me that I could work out what I needed. I usually use the trial and error method :-)
« Last Edit: August 29, 2013, 10:43:12 PM by G1ZmO »
Paul

Mike

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Re: ND filters
« Reply #5 on: August 29, 2013, 11:31:04 PM »
No probs :)

You can see a chart of EV values here:

http://en.wikipedia.org/wiki/Exposure_value#EV_as_an_indicator_of_camera_settings

very handy
 PS scroll down slightly and you can see that any EV value can be accomplished by diffferent combinations of f/number and shutter speed
« Last Edit: August 29, 2013, 11:47:51 PM by Mike »
Rgds,  Mike

GrantR

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Re: ND filters
« Reply #6 on: August 29, 2013, 11:35:35 PM »
To lose that pink you'll need at least a set of Hitech 100x150's or a set of Lee grads. The Lee foundation kit is the holder you want, 60. You'll need the Lee adapter ring for the lens, get the size of your biggest lens and use setup rings for the rest, about 20. A set of Lee grads will set you back around 180, a set of Hitech's around 140. You'll never use the 0.3 so could try to shift it on Ebay to get some of the cost back. I've used a 0.6 and 0.9 Hitech 150x100 stacked for ages and never had a colour cast except against a flat grey sky. I'm looking for a set of Lee's just now but they are not exactly easy to find in stock anywhere.


If you want to do real long exposure stuff get a Heliopan screw in ND3.0 ten stopper. It's fantastic. About 90 for a 77mm but as it's a screw in, no light leak problems and you can stack 2 grads in front with the Lee holder. Whatever you do, do NOT buy the new Hitech IRND 10 stopper, it's absolute crap. I've also got an older Hitech 10 stopper and it's only good for mono work as it colour casts so bad.

G1ZmO

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Re: ND filters
« Reply #7 on: August 30, 2013, 07:28:19 AM »
Thanks Mike and Grant for the info and advice. I'll bear all that in mind and maybe look for a set later in the year once our expenses settle down. Ignoring the fact that the wedding is on the horizon lol

Paul

Sent from my Nexus 7 using Tapatalk 2

Paul

Mike

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Re: ND filters
« Reply #8 on: August 30, 2013, 02:01:31 PM »
I have the following stuff sitting in a cupboard, boxed and barely used:

Hitech Filter Holder: http://www.teamworkphoto.com/hitech-metal-modular-holder-105mm-front-ring-p-16436.html 55 new

58mm adapter http://www.teamworkphoto.com/hitech-standard-adapter-ring-p-10436.html 14.50 new
77mm adapter 14.50 new
77mm WA adapter http://www.teamworkphoto.com/hitech-wide-angle-adapter-ring-p-10437.html 29.00 new

Filter Case  http://www.teamworkphoto.com/hitech-filter-pouch-p-16543.html 18.95 new

Total 131.95

I would do the lot for 50 - they have hardly been used as my parents gave me the Lee set for Xmas.

They aren't going anywhere fast so happy to hang onto them while you get the important things in life sorted (weddings etc).

If you aren't interested or feel it is too much then no probs.
Rgds,  Mike

G1ZmO

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Re: ND filters
« Reply #9 on: August 30, 2013, 06:36:40 PM »
I'll bear that in mind Mike. Tempting :) but my main lens is an 82mm dia so I guess I'd need another adapter
Paul

Mike

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Re: ND filters
« Reply #10 on: August 30, 2013, 08:15:57 PM »
You can always buy some stuff from me and then just get the adapter ring you need from teamwork.  I'm open to negotiation as the stuff is just lying in a cupboard doing nothing.  As I said, no rush.
Rgds,  Mike