ND filters
PhotoCamel: Your friendly photo community, with free discussion forums, digital photography reviews, photo sharing, galleries, downloads, blogs, photography contests, and prizes.
 

Go Back   PhotoCamel - Your Friendly Photography Forum > Tools Of the Trade > Camera Accessories

Reply
 
LinkBack Thread Tools Display Modes
Old 02-03-2013   #1
Llama
 
photodoc1's Avatar
 
Location: Cincinnati
Posts: 667
CamelKarma: 486555
Editing OK?: Yes
Constructive Critique?: Yes
Default ND filters

So I learned today that I need to get some filters....specifically ND filters. I was out hiking around and wanted to take some creek/water shots with the snow...impossible. Best I could get was 1/13 @ f/22 & ISO 50 and this didn't give me what I was looking for.

I don't know a whole lot about ND filters and was looking for some input. Does anyone have some good articles/links on ND filters? Also, what are the advantages to a screw on type vs the square/rectangular type (not entirely sure of the name)? Where should I start? I have both a 77mm and 67mm filter size lens so it sure would be nice to be able to use one filter on both.

__________________
Members don't see ads in threads. Register for your free account today and become a member of PhotoCamel to open up the site's many benefits and features.
__________________
Canon 5D mkII | 70-200 f/4L IS | 17-40 f/4L | 24-105 f/4L | 100 f/2.8L | 85 f/1.8 | Lee Filters |

Critique encouraged.
photodoc1 is offline   Reply With Quote
Old 02-03-2013   #2
F1 Camel
 
blumesan's Avatar
 
Posts: 3,040
CamelKarma: 661924
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: ND filters

If you don't require any graduated nd filters then you can stick with just the round (screw on) type. The cheaper off brands may have a tendency to impart a color cast so avoid those. Buy a 77mm filter and a 77 to 67mm step down ring so you can use one filter on all lenses. Get a good idea of about how much you wish to increase the exposure time before you go shopping. ND filters come in a wide variety of densities.
__________________
My Gallery
blumesan is offline   Reply With Quote
Old 02-04-2013   #3
Llama
 
photodoc1's Avatar
 
Location: Cincinnati
Posts: 667
CamelKarma: 486555
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: ND filters

I like the idea on the square filters that only part of the image frame can be covered. They just seem much more versatile. I feel this would work great for landscapes. what are the quality differences with the different materials?
__________________
Canon 5D mkII | 70-200 f/4L IS | 17-40 f/4L | 24-105 f/4L | 100 f/2.8L | 85 f/1.8 | Lee Filters |

Critique encouraged.
photodoc1 is offline   Reply With Quote
Old 02-05-2013   #4
Llama
 
scootermcq's Avatar
 
Posts: 617
CamelKarma: 340977
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: ND filters

Get the filter for the larger size and use a step up ring
scootermcq is offline   Reply With Quote
Old 02-05-2013   #5
PhotoCamel Supporter DONATED
Camel Breath
 
Location: South Yorkshire, UK
Posts: 42,959
CamelKarma: 44269892
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: ND filters

Square filters are certainly more versatile. For covering only part of the frame graduated ND filters would be better. Cokin P system (84mm filters) or equivalent size from other manufacturers should be OK for your lenses. You would need adapter for each thread size but the same filter holder and filters will go on all lenses.
__________________
gautam
Gautam is online now   Reply With Quote
Old 02-12-2013   #6
Alpaca
 
patpap25's Avatar
 
Location: Cocoa Beach, Florida
Posts: 38
CamelKarma: 53094
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: ND filters

You might want to take a look at the Genustech Eclipse, it is a variable ND filter. I have had some fun with mine.
www.genustech.tv/home/eclipse-nd-fader-77mm
patpap25 is offline   Reply With Quote
Old 02-13-2013   #7
Llama
 
photodoc1's Avatar
 
Location: Cincinnati
Posts: 667
CamelKarma: 486555
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: ND filters

Quote:
Originally Posted by patpap25 View Post
You might want to take a look at the Genustech Eclipse, it is a variable ND filter. I have had some fun with mine.
www.genustech.tv/home/eclipse-nd-fader-77mm
That is interesting. It doesn't allow for any gradients though so you have to do the whole scene. The price doesn't seem that bad either.
__________________
Canon 5D mkII | 70-200 f/4L IS | 17-40 f/4L | 24-105 f/4L | 100 f/2.8L | 85 f/1.8 | Lee Filters |

Critique encouraged.
photodoc1 is offline   Reply With Quote
Old 02-13-2013   #8
F1 Camel
 
blumesan's Avatar
 
Posts: 3,040
CamelKarma: 661924
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: ND filters

Quote:
Originally Posted by photodoc1 View Post
That is interesting. It doesn't allow for any gradients though so you have to do the whole scene. The price doesn't seem that bad either.
The graduated ND filters cannot be designed as variable density filters. The two concepts are not compatible.
__________________
My Gallery
blumesan is offline   Reply With Quote
Old 02-13-2013   #9
Llama
 
photodoc1's Avatar
 
Location: Cincinnati
Posts: 667
CamelKarma: 486555
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: ND filters

Quote:
Originally Posted by blumesan View Post
The graduated ND filters cannot be designed as variable density filters. The two concepts are not compatible.
Yeah that is obvious, I was just stating it has limitations.
__________________
Canon 5D mkII | 70-200 f/4L IS | 17-40 f/4L | 24-105 f/4L | 100 f/2.8L | 85 f/1.8 | Lee Filters |

Critique encouraged.
photodoc1 is offline   Reply With Quote
Old 02-13-2013   #10
F1 Camel
 
Sailor Blue's Avatar
 
Location: Bangkok, Thailand
Posts: 4,140
CamelKarma: 227845
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: ND filters

You can use a square ND filter as a variable density ND filter. Just hold it in front of the lens and bob it up and down during a long exposure. The top will in effect be darker than the bottom or vice versa depending on whether you bob from the top or the bottom.

Many ND filters add a color cast. You can pretty well correct for this is you use a WB card but you will get the most accurate colors if you use a Color Checker card. I recommend the X-Rite ColorChecker Passport.

Robin Myers Imaging: Digital Gray Card

X-Rite ColorChecker Passport – X-Rite Photo – X-Rite Passport

With a strong ND filter you can get light leaking in through the viewfinder and spoiling your image. Be sure to block the viewfinder with long exposures. I think Nikon cameras have a viewfinder shutter while Canon includes a crappy piece of rubber that you attach to your camera strap and which fits into the viewfinder.

You can simulate a long exposure by combining multiple shorter exposures. One perfect example would be for your flowing water. Take sufficient exposures to equal the long exposure you want then use a program like Photoshop to stack them (turn off the remove ghosts functionality). The moving water will smooth out nicely. You might even wind up with an image that has less noise than from a single very long exposure.

If you want you can even use different exposures and create a HDR image. Whether or not you use different exposures the resulting file from stacking is a 32-bit one. This 32-bit image also allows you to do some amazing exposure modifications without banding.

If I remember correctly the stacked images are all on separate layers so you can do things like mask out sections of all but one layer. You would do this to leave the limbs of the trees still while allowing the water in all the layers to blur together. You can also do this to make a moving person disappear by removing them from each layer.


__________________
Members don't see ads in threads. Register for your free account today and become a member of PhotoCamel to open up the site's many benefits and features.
__________________
--Don--

Canon 7D, Canon EF-S 18-55mm f/3.5-5.6 IS II, Tamron SP AF28-75mm F/2.8 XR Di, Canon EF 70-200mm f/4L IS USM, Tamron SP 90MM F/2.8 Di 1:1 Macro
Nissin Di866, Electra CLASSIC Plus studio strobes & modifiers
Sekonic L-358 Flash Meter, Yongnuo RF-602 Transmitters & Receivers
Dell 20" 2001F (1200x1800) IPS monitor, Samsung SyncMaster 23" F2380 (1920x1280) PVA monitor, Datacolor Spyder3Elite for monitor calibration
Sailor Blue is offline   Reply With Quote
Reply

« PhotoCamel - Your Friendly Photography Forum > Tools Of the Trade > Camera Accessories »


Share this topic:

Thread Tools
Display Modes

Similar Threads
Thread Thread Starter Forum Replies Last Post
Filters Linda G Kids & Family 10 09-15-2011 10:14 PM
Filters boristhemoggy Camera Accessories 3 05-09-2011 05:17 AM
UV Filters Vs. Clear Filters Ken-L Photography Talk 39 01-23-2011 02:01 PM
WTT: My 58 filters for a couple 52mm UV filters glockman99 Marketplace / Buy-Sell 0 03-06-2009 10:35 AM
screw on filters vs. cokin filters on388 Nikon 18 10-30-2007 06:01 PM