Hi,
A regular 2 ND filter will cut the light in half.
Ben
On Thu, Jun 24, 2021 at 2:25 PM Bartsch, DIRK-UWE <dbartsch@xxxxxxxxxxxxxxx>
wrote:
1% is the correct transmission for a 2.0 ND filter.
Here is a handy web reference from Edmund Optics
https://www.edmundoptics.com/knowledge-center/application-notes/optics/understanding-neutral-density-filters/
<https://www.edmundoptics.com/knowledge-center/application-notes/optics/understanding-neutral-density-filters/>
Understanding Neutral Density Filters | Edmund Optics
<https://www.edmundoptics.com/knowledge-center/application-notes/optics/understanding-neutral-density-filters/>
Neutral Density (ND) filters are designed to reduce transmission evenly
across a portion of a specific spectrum. ND filters are typically defined
by their Optical Density (OD) which describes the amount of energy blocked
by the filter. A high optical density value indicates very low
transmission, and low optical density indicates high transmission
(Equations 1 – 2).
www.edmundoptics.com
------------------------------
*From:* optimal-bounce@xxxxxxxxxxxxx <optimal-bounce@xxxxxxxxxxxxx> on
behalf of Laine <laine@xxxxxxxxxxxxxxxxxxxxx>
*Sent:* Thursday, June 24, 2021 2:16 PM
*To:* optimal@xxxxxxxxxxxxx <optimal@xxxxxxxxxxxxx>
*Subject:* [optimal] Re: Neutral density filter
Are you asking what the transmission % is? 1%
On Jun 24, 2021 4:09 PM, Kirsten G Locke <kglocke@xxxxxxxxxxxxxxxxxxxx>
wrote:
2.0 ND means that it cuts light by 10^2 (or 100) times.
Thanks,
Kirsten
*Kirsten Locke, CRA. OCT-C. RN. FOPS*
*Clinical Trials Manager*
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*From:* optimal-bounce@xxxxxxxxxxxxx [mailto:optimal-bounce@xxxxxxxxxxxxx]
*On Behalf Of *Eric Kegley
*Sent:* Thursday, June 24, 2021 3:40 PM
*To:* optimal@xxxxxxxxxxxxx
*Subject:* [optimal] Neutral density filter
Hello all,
This is the second time in a week that I am having to ask for help. What
is optical density of a 2.0 log unit neutral density filter?
Thank You,
*Eric Kegley, CRA, OCT-C, FOPS, COT*
Director of Imaging
Retina Consultants of Texas Research Centers
4460 Bissonnet St, Ste 200
Bellaire, TX 77401
O: 713.524.3434 ext. 4831
D: 713.394-7531
C: 281.236.0215
F: 713.795.4552
RetinaConsultantsTexas.com
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