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Hi Jim,
Thanks for your comment. Unfortunately the fish will vary in length
according to spp - I'm interested in fish from <50 mm to 500 mm. I guess
most fish will be ~300 mm. I thnk I'm going to go for SLR digital as I can
then use the same camera for microscope work and I can instantly play with
the images on screen.
I'm going to be dealing with dead fish, so I think I'll pin 'em out.
again thanks
Chris
-----Original Message-----
From: Scientific forum on fish and fisheries
[mailto:[log in to unmask]]On Behalf Of James H. Power
Sent: 09 February 2005 16:56
To: [log in to unmask]
Subject: Re: Photographing fish for morphometrics
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Chris: How big are your fish?
And a couple of suggestions from some work I did a while back. I used a
photographic copy stand with a Nikon camera mounted on a bellows (and the
Nikon lens mounted on the other end of the bellows, of course). The bellows
allows you to adjust image magn
ification to fill the frame. For lighting I used a ring flash which is like
a regular camera flash, except that the flash tube is formed in a ring that
surrounds the camera lens. The flash screws into the camera lens just as a
lens filter would. Use a
remote shutter release so the camera doesn't shake when you shoot the
picture.
My work was done before digital cameras became widely available. If you
have the budget, I'd suggest one of the professional grade digital cameras
based on a SLR camera body. The reason I suggest this is that by having a
standard (Nikon or other) lens m
ount you can then mate the camera to a bellows, your choice of lenses, or a
microscope. That's something you can't do with a low-end digital camera
that has a fixed lens.
I immersed the fish on their side in water so they'd have a natural body
conformation when photographed. I saw a paper a long time ago (I forget the
citation) where the investigator anesthetized the fish, and then used a
small tube (and syringe I think?)
to suck onto one side of the fish; he or she then used the tube holding the
fish by suction to position the fish in its normal swimming orientation, and
then photographed the fish from the opposite side of the tube.
Jim Power
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>
> Dear all,
> I'm involved in a project looking at variation in fish morphology & we
will
> be photographing fish and using geometric analysis to look at shape etc.
> I want to construct a frame to ensure all fish are photographed under the
> same conditions (light etc).
> Has anyone got any handy pointers regarding design, choice/intensity of
> lights etc?
>
> I have gone to google, but all my searches lead to pages describing the
> photography of fish in tanks or underwater!
>
> All the best
> Chris
>
>
> ><> ><> ><> ><> ><> ><> ><> ><> ><>
> Dr Chris Harrod
> Max Planck Institute of Limnology
> Dept Physiological Ecology
> Postfach 165
> D-24302 Plon
> Germany
>
> [log in to unmask]
> Tel: +49 (0)4522 763 283
> Fax: +49 (0)4522 763 310
>
> www.mpil-ploen.mpg.de/
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