Hello Richard:
The SL66 is not like a View Camera, it only allows to
tilt the lens like you could tilt a cardboard as John explained; the
purpose is to increase or to diminish the DOF beyond the limits you could
reach playing with the f stops keeping in mind it's a MF camera with
advantages and disadvantages regarding a View Camera. The function is very
useful to photograph a group of items keeping their depth and sharpness,
but you couldn't correct perspective distortions like a building or a
church vertical lines, you need a View Camera (or PS) for that purpose. I
think this SL66 function is aimed at commercial photography mainly, but it
can be used for other purposes too, BTW.
I I hope a quick improvement for your carpal tunnel problem.
Carlos
2017-03-26 22:25 GMT-03:00 `Richard Knoppow <dickburk@xxxxxxxxxxxxx>:
I think it helps to visualize the image plane. Moving either the front
or back of the camera is like extending the image beyond the normal limits
of the film. You select the part of the image you want. This is where the
lens and film planes remain parallel. When the lens or film is tilted it
really changes the direction the camera is pointing. When either the image
plane or lens plane is tilted it really also tilts the object plane. The
plane of focus really remains the same but is tilted in space to the film
plane cuts through it. The effects become obvious if you have a good, wide
coverage, lens on a camera with adequate movements and play with them. I
am not sure what movements are available on the SL-66 (I don't have one).
Tilting the lens or film plane have different effects than moving them in
parallel. The effect of either on illumination becomes clearer when one
pictures how the image, object and lens plane interact.
I really MUST get my carpal tunnel problem fixed. I can hardly type
any more. UGH!!!
On 3/26/2017 5:33 PM, CarlosMFreaza wrote:
Yes John, I called it the Scheimpflug angle in my post, they are really
the angles of the Scheimpflug principle, the Scheimpflug intersection is
where the angles of the subject plane, the lens plane and the image plane
have an intersection.
I watch the DOF effect whilst tilting the lens in the focusing screen
directly, however you could lose some details sometimes because the screen
loses luminosity for some areas according you tilt the lens, the
Scheimpflug indicator cards can help for a better planning, I don't have
the original transparent, it would be nice to have the 80mm lens indicator
at least, I'll write you off list tomorrow, thank you very much John.
Carlos
2017-03-26 20:11 GMT-03:00 John Wild <jwild@xxxxxxxxxxxxxxxxxxxxxx>:
Carlos, that's a nice collection.--
I'm sure you know that with the Scheimpflug principle, when tilting the
lens with respect to the film plane, the plane of focus is no longer
parallel to the film but, with respect to the SL66, it
leans forward like a piece of cardboard.
With the focus hood, being taller than the rest of the items it goes
above the plane of focus, a bit like the items being tilted and
submerged underwater but the top of the camera is above the surface and so
it is no longer in focus.
Do you have the Scheimpflug calculation cards for the SL66? I think I
have a spare if you would like one.
John
------------------------------
*From:* rollei_list-bounce@xxxxxxxxxxxxx <rollei_list-bounce@freelists.
org> on behalf of CarlosMFreaza <cmfreaza@xxxxxxxxx>
*Sent:* 26 March 2017 12:35
*To:* rollei_list@xxxxxxxxxxxxx
*Subject:* [rollei_list] Rollei SL66 Distagon 4/80
I took yesterday a photograph about the equipment my father often used
when he had photography as a hobby;it's from the '50s and I'm still using
it. The Rolleiflex 2,8C Xenotar and the Gossen Sixtomat and the Walter Voss
Diax IIb are in perfect working order.
The image was taken with the Rolleiflex SL66 CZ Distagon 4/80, Kodak Tmax
100 developed with Romek PQ7 1:3. I used the camera capability to tilt the
lens, the 2,8C viewfinder hood is out of focus slightly and its Xenotar
lens is in focus, it happens due to the Scheimpflug angle, I need a bit
more of practice:
Richard Knoppowdickburk@xxxxxxxxxxxxx
WB6KBL
