Digital Camera Settings Used for Photography through the Microscope
MICROSCOPE CAMERA SETTINGS - CONTENTS: How to choose the best settings for a digital camera to take photographs through the microscope, Recommended camera adjustments and settings for use with a microscope
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Digital camera settings for microphotography:
This article explains the optimum settings to use when taking digital camera photographs through the microscope.
The purpose of this paper is to help microscopists photograph, store, and use digital microphotographs
using modern digital cameras and transmitted-light microscopes. Discussion focuses on selection of cameras adapt well
to microscope eyepieces or trinocular heads, and on camera settings and procedures to obtain best quality photographs. We also discuss image resolution and size settings and make recommendations. Cameras used as examples in this paper
include the Nikon Coolpix series 990, 995, and 4500.
Digital Camera Settings Used for Microscope Photography
[The photograph at page very top is one of our earliest attempts
at photographing Aspergillus sp. using lacto phenol cotton blue stain. Even a beginner can obtain very good
microphotographs with just a little care. The photograph shown here is of one of our stereoscopic microscopes
in use for making digital photographs.
The Nikon Coolpix 900-series and the 4500 camera can take wonderful photos on fully automatic, but to make
photomicrographs you may have more success if you make use of some of the manual camera settings as follows (for the
Coolpix 990. Find and make the comparable settings in the 850, 950 and 4500 menus). Most other digital cameras will
have a similar set of camera setting options but they may be organized around a different menu system. Find and
adjust the equivalent settings on your particular camera, using the guidelines listed below.
Automatic Settings for digital cameras with the microscope
In general the "automatic" settings of the camera work pretty well - it has general modes of "Automatic", Manual,
Program, and Shutter - set by holding Mode (Func 1) button on camera top and turning the thumb wheel - your camera
should start in "Automatic".
Image print size, resolution, and disk space
The camera has a number of image size (3:2, XGA, VGA, FINE) settings and within XGA and VGA you also specify the
resolution (Basic, Normal, Fine, and "HI" the last of which makes a huge TIFF file you don't normally want). Image
size refers to the intended final display or print size. Resolution refers to the level of data compression in the
stored image file. Larger size and higher resolution mean larger image files (and more disk space consumption).
We usually shoot at XGA-Fine which will let us print a high-resolution 8x10 photo if we want a printout, but keeps the
disk file sizes down to a manageable 200-300K bytes. You could shoot at XGA-Fine with good result but if you ever
want to crop and zoom in on a particle in your photo you may not like the quality. If you want to save disk space and
if you never plan to zoom in or enlarge your images, shoot at VGA-Fine which will produce excellent but smaller
photos. Remember however that often you may want to enlarge a portion of a photomicrograph to see detail or for
publication. You can't do much enlarging of a "VGA" image.
To email photos to someone you'll want to use a photo editing program to make a smaller, lower-resolution image to get
the file size down to about 30K. (Folks who have the CD-ROM from the Laurentides Spore Camp received down-sized
images which you'll see don't stand up to close scrutiny nor to any zooming.)
Some experts argue that one need not bother to keep images of higher resolution than the resolution capacity of the
printer to be used for final images. Because we use images for reference and identification (email-exchange) purposes,
often with images cropped and enlarged, and because we rarely print large images, the choice of image size is not
reduced to printer resolution.
In sum: for image library purposes and printing up to 8x10 you do not need to store high resolution, large image size
files - which wastes disk space. However if you need to crop and enlarge a portion of a photographic image you will
want to shoot at higher resolutions and perhaps sizes. If in the microscope we know in advance I'm going to want to
crop and enlarge we shoot at fine or high resolution image sizes. we have not required use of uncompressed TIFF type
images for these purposes.
Manual setting mode for Nikon Coolpix series Cameras with the microscope
Turn the camera on to "Manual" mode" Not to confuse with the "Automatic" overall MODE setting above, to use the
Coolpix through the microscope eyepiece we shoot with the ON-OFF DIAL in "Manual" mode (as opposed to fully Automatic)
- set the dial that turns the camera on to "M" rather than "A".
Access the camera settings menu for basic photo settings:
Press the "Menu" button on the back of the camera (above the display screen) and then using the round thumb button to
scroll and select, and the "picture taking" button to select each setting (there are shortcuts which I'm leaving out
for simplicity), choose the following settings:
For digital photos through the microscope - A (auto) will work, but better, mount and focus on one of your typical slides on the microscope stage. Move
the slide so that there are few particles in the field of view - mostly white space, or all white space. Then
use the camera's menu, at "White Balance" select "White Bal Preset,"then select "measure," and the camera will set
a reasonable white balance for your microscope and slide set-up. This should produce images with color very close to
what you see through the eyepiece. If this is not the case, you may have changed some microscope settings and you'll need
to repeat this process.
Metering - Matrix or Center Weighted
Continuous - S (single shot not continuous shooting)
Best Shot Selector - Off
Lens - Normal
*** Image Adjustment: either Auto or we prefer "More Contrast" but you should try "Auto" or "Normal" alternatives as
*** Image Sharpening: either Auto or we prefer "High" but you should try "Auto" or "Normal" alternatives as well.
The *** items are helpful for better photomicrographs but are not essential.
Set the camera to Macro Mode
On the back of the camera the bottom left button "M focus" press repeatedly until you see the little Tulip Flower in
the upper right display. Now on the upper right of the camera back adjust the zoom (Ranges between "wide angle" and
"telephoto") until you see the tulip flower turn yellow - which means you are in "Macro Lens" mode. (On the 850 just
turn the dial to "CSM" mode.)
Infinity as an alternative to Macro Mode
Macro mode and auto focus can often focus the camera to produce a better image than a human can do manually. However
if the object of interest lacks strong lines and contrast, the camera may have trouble focusing. Alternatively, you
may wish to be sure the focus concentrates on specific features or ornamentation. For these purposes, set the camera
to infinity mode, and then observing the image in the camera LCD, you can fine-tune the camera focus by adjusting the
microscope stage height slightly up or down as needed.
Turn off auto flash:
On the back of the camera bottom center button, press until you see a circle with a slash through the flash lightning icon.
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