Reef Central Online Community

Home Forum Here you can view your subscribed threads, work with private messages and edit your profile and preferences View New Posts View Today's Posts

Find other members Frequently Asked Questions Search Reefkeeping ...an online magazine for marine aquarists Support our sponsors and mention Reef Central

Go Back   Reef Central Online Community > Special Interest Group (SIG) Forums > Photography
Register Blogs FAQ Calendar Mark Forums Read

Notices

User Tag List

Reply
Thread Tools
Old 03/29/2006, 02:39 AM   #1
richfavinger
Premium Member
 
richfavinger's Avatar
 
Join Date: Aug 2004
Location: Pottstown, PA
Posts: 866
Lightbulb Exposure, Compensation and the Histogram

Understanding Exposure

Why Is Exposure Compensation Necessary?
A camera's exposure meter is always calibrated at the so-called middle gray level, which means the gray color that is in the middle between complete white and complete black and reflects 18% of the incoming light. When you point your camera at your subject and take a meter reading, the meter will consider the intensity of light being read as middle gray. This creates problems!

Suppose most areas in your scene is white, say snow covered. The exposure meter will treat that white area as middle gray. When you take your shot, the white area looks grayish. The image below shows a snow covered area, and, as a result, the camera exposure meter considers this white area being middle gray if no compensation is applied. So, the snow covered area looks grayish.

More About Exposure Compensation

Remember, most people forget, using or shooting digital is more like using SLIDE FILM, in this you have very little room to play with in error +/- bad exposure. You can have as much as 3 or even 4 stops of exposure in negative film. In Digital and slide, you only have about 1.5.

In your reef tank using your spot meter on your camera can help a lot.
Also understanding your cameras Histogram is key...

Understanding the Histogram

If you nail your exposure, remember it's just less work you need to do in Photoshop!
It also makes you a better photographer...
Rich


richfavinger is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -6. The time now is 03:35 AM.


TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2021 Axivo Inc.
Use of this web site is subject to the terms and conditions described in the user agreement.
Reef CentralTM Reef Central, LLC. Copyright 1999-2014
User Alert System provided by Advanced User Tagging v3.3.0 (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.