The
quality of your enlarging lens
will lead to better and sharper results at greater magnification. The aperture
( low number = large opening, high number = small opening) you set not only
affects the amount of light it lets through but the depth of field as well. A
good average aperture is F/5.6 in most cases. If the exposure times are to
short a larger F number is needed, this will give you a chance to hold back
shadow areas that may become to dark to show any detail. But don't get carried
away and close down the lens by too many
F numbers as this may over heat the negative causing it to buckle, making the
picture loose sharpness.
Showing posts with label magnifiaction. Show all posts
Showing posts with label magnifiaction. Show all posts
Friday, 27 January 2012
Saturday, 31 December 2011
Magnification on your enlarger
This
is going to get a bit technical, so
bear with me! This is the ratio between the print and the negative. It is
calculated using the linear rule. To make things easy, lets say we are going to
enlarge a thirty-five mm negative (24 x 36 mm) by a factor of ten this will
give us a print size of 240 x 360 millimeters ( about 9" x 14") in
size.
Magnification
is related to the distance the negative is from the enlarging lens and the lens
from the baseboard. So as the latter distance increases the former decreases.
In other words the higher the enlarging head is from the baseboard the closer
the lens gets to the negative when it is being focused and vice versa. It
stands to reason that the larger the print the longer the exposure time will
need to be. There will also need to be a change in paper grade to a harder one
as there is a softening in the contrast.
Labels:
35mm,
contrast,
enlarger,
len,
magnifiaction,
negative,
photography,
size,
traditional
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