On 7 Jan 2001, at 9:50, sayeth Gary Reese
> Hi Hans:
>
> << I would think the rule of focal length and lowest shutter speed for
> hand holding does not apply for macro lenses when their magnification is
> equal. Iow when both lenses are set at 1:2 the shorter focal length of
> the 50mm lens no longer gives you any advantage in shutter speed
> tolerance. >>
Why not? The angle covered is still in proportion to the focal
length. But at macro distances, the angle reduces significantly. At
1:1 it is half the angle ar infinity. So the shutter speed
requirement goes up proportionately.
>
> Perhaps you are right here - I never thought of it. But, the background
> bokeh is much futher away, thus a different subject magnification, ah?
> Camera movement will kill nice bokeh if it is combined with streaking
> from camera movement. How odd to be speaking of "blurry bokeh" - but
> it's real and something I was always aware of in nature photography.
> Even before I knew what to name it.
>
> With either lens, the X-sync speed of 1/60th makes it more difficult
> than it should be in eliminating ghost images in flash pictures. Outdoor
> flash shots, for example of flowers, are barely stronger than the
> ambient light. In open habitats, I always had to use a slowish film, an
> ND filter or diffuser on the T32 and an aperture between f/11 and f/22
> to do my synchro sunlight technique of having the flash 1 to 2 stops
> stronger than the ambient light. Shoot something in open shade and it
> required 1/30th sync speed to keep the background from going black. I
> always felt more comfortable with a 50mm macro lens in these situations.
Or keep that grey card handy as a background...
>
> Why use flash, some might ask? You can control modeling, get some degree
> of arresting subject movement, increase subject contrast and apparent
> sharpness and highlight subjects against their background. The trick
> isn't to overpower the subject with flash illumination. Let the ambient
> light fill in the shadows.
And/or use a reflector. More fiddliness.
Tom
-----------------------------------(no spam please)
Tom Trottier <TomATrottier@ home.com> ICQ: 57647974
Abacurial Information Technology Consulting
400 Slater St. Suite 415, Ottawa ON Canada K1R 7S7
__o +1 613 291-1168 fax:594-5412 (877)247-8796
_ \ < Vote for your favourite Olympus camera at
(+)/'(+) http://www.freevote.com/booth/fav_camera
Mensa Ottawa: http://www.egroups.com/MensaOttawa
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|