Lee Filters ProGlass IRND User manual

Instruction booklet
10 0 mm SW150

Available in two, three, four, six, 10 and 15-stop strengths, ProGlass IRND
filters are designed to extend shutter speeds and allow for the creative
blurring of any area of the frame that is moving. Depending on the length of
shutter speed, subjects can become soft and ghost-like – or even disappear
entirely. Clouds, waterfalls, rivers and the sea are typical subjects, but the
filters can also be used in the urban environment to depict movement in
trac or crowds of people.

Composing the Image
Set up the camera on a tripod and
compose the image as normal
WITHOUT the filter. Switch your
camera from autofocus (AF) to
manual focus (M).
Exposure
Calculating the exposure is simple.
Take a meter reading as normal
WITHOUT the filter in place, then
choose and set your aperture. Then,
taking the metered shutter speed,
refer to the table to find out your
new shutter speed with your chosen
ProGlass IRND filter in place.
Each ProGlass IRND filter comes
with a card featuring a chart that
shows the shutter speed adjustments
required when using the filters. You
can also download the LEE Filters
ProGlass IRND Exposure Guide app
(free of charge, available for both
Apple and Android), so that you
have all the necessary information
on your smartphone.
Be aware of changing light levels.
If you are shooting at dusk, light
levels will reduce over the period of
your exposure, so you will have to
increase your shutter speed further.
Conversely, if you are shooting at
dawn, light levels will increase
and you will want to reduce the
length of the exposure. You will
need to experiment!
Remember, your aperture stays
the same, it is the TIME part of the
exposure you want to change.
Shooting the Image
Once you have composed the image,
focused in the normal way and
metered, place the filter into the
holder. The filter must be placed in
the rear filter slot, closest to the
holder backplate, with the foam seal
facing the backplate (the two, three
and four-stop versions of the ProGlass
IRND filters do not have foam seals).
This prevents any light getting behind
the filter and causing flare.

Before you press the shutter, cover
the viewfinder eyepiece. This prevents
light reaching the sensor through the
viewfinder and creating fogging or
flare that will spoil your image. Most
modern cameras have a small built-in
metal shutter or a plastic cap that can
be placed over the eyepiece, but a
piece of sticky tape is just as eective
– or you can simply hold your hand
over the eyepiece. However, be
careful not to touch the camera
during long exposures.
Electronic Noise
If your exposures are running to
several minutes, electronic noise
will increase and be visible in your
image. If this causes problems,
most photo-editing software has a
noise-reduction facility, and many
cameras have a long-exposure
noise-reduction feature.
Shooting with Film
When shooting long exposures
with film, you will encounter
reciprocity failure. In basic terms,
this means that beyond a certain
shutter speed, film will underexpose,
therefore your shutter speed will
need to be extended accordingly.
For example, if your shutter speed
with the ProGlass IRND filter in
place is 30 seconds, this may need
to be doubled to one minute if
shooting on film. It can vary from
emulsion to emulsion, however, so
check with the manufacturer of the
film you are using.

Normal
Shutter
Speed
0.6ND
(2 stop)
0.9ND
(3 stop)
1.2ND
(4 stop)
1.8ND
(6 stop)
3.0ND
(10 stop)
4.5ND
(15 stop)
1/2000sec 1/500sec 1/250 sec 1/125 sec 1/30 sec 1/2 sec 15 seconds
1/1000sec 1/250 sec 1/125 sec 1/60 sec 1/15 sec 1 second 30 seconds
1/500sec 1/125 sec 1/60 sec 1/30 sec 1/8 sec 2 seconds 1 minute
1/250sec 1/60 sec 1/30 sec 1/15 sec 1/4 sec 4 seconds 2 minutes
1/125sec 1/30 sec 1/15 sec 1/8 sec 1/2 sec 8 seconds 4 minutes
1/60sec 1/15 sec 1/8 sec 1/4 sec 1 second 15 seconds 8 minutes
1/30sec 1/8 sec 1/4 sec 1/2 sec 2 seconds 30 seconds 16 minutes
1/15sec 1/4 sec 1/2 sec 1 second 4 seconds 1 minute 32 minutes
1/8sec 1/2 sec 1 second 2 seconds 8 seconds 2 minutes 1 hr, 4 mins
1/4sec 1 second 2 seconds 4 seconds 15 seconds 4 minutes 2 hrs, 8 mins
1/2sec 2 seconds 4 seconds 8 seconds 30 seconds 8 minutes 4 hrs, 16 mins
1 seconds 4 seconds 8 seconds 15 seconds 1 minute 16 minutes 8 hrs, 32 mins
2 seconds 8 seconds 15 seconds 30 seconds 2 minutes 32 minutes 17 hrs, 4 mins
Exposure Guide

www.leefilters.com
Quick User Guide
> Step 1- Set the camera up on a tripod and compose the image as
normal WITHOUT the filter in place. Switch your camera from autofocus
(AF) to manual focus (M).
> Step 2 - Take a meter reading and calculate your exposure as normal
WITHOUT the filter in place, and set your preferred aperture for the shot.
Now adjust your shutter speed to allow for the density of the filter you
are using. Use the exposure card supplied or the ProGlass IRND Exposure
Guide app to calculate your shutter speed.
> Step 3 - Once you have composed the image, manually focus the lens,
then place the filter into the holder. The filter must be placed in the rear
filter slot, closest to the holder backplate, with the foam seal facing the
backplate. Attach a remote release to the camera. (Cover the viewfinder
eyepiece before releasing the shutter). Fire the shutter and lock it open for
the required time. At the end of the exposure, close the shutter.
The ProGlass IRND range can be used in conjunction with other filters
such as neutral-density graduated filters and a polariser. Other filters
should be set up and positioned in the holder before adding the ProGlass
IRND filter – remember to keep the slot in the filter holder nearest the
backplate free for the ProGlass IRND filter.