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//globalassets/knowledge-center/app-notes/thumbnails/understanding-nuetral-density.jpg]<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
Retina Foundation of the Southwest
9600 N. Central Expressway, Suite 200
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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
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