Setting the parfocality
I have an LM DSLR adapter. How do I ensure that the image is in focus both in the eyepiece and on the camera at the same time?
All LM DSLR adapters are equipped
with an international standard C-mount connection. This C-mount
connection has a flange focal length of 17.52 mm. The flange focal
length describes the distance between the microscope’s C-mount
connection and the camera’s sensor chip level. If the microscope that
you are using also has an international standard C-mount connection
thread, then the image will be in focus in both the eyepiece and on the
camera display at the same time. If you notice a very large difference
between the focus settings, please check the C-mount connection on your
microscope. The C-mount connection must have a factor of 1x and may not
have any inbuilt optics.
If you determine that this is not the
case with your microscope, and it is not possible to refit it with a
standard C-mount connection, then photographs can be taken using an
ocular tube. For this purpose, one of your microscope’s eyepieces is
removed and an LM digital adapter with tube connection is used instead.
If the
difference in focus between the eyepiece and the camera display is only
very small, then the following optimization options are available:
If you possess a microscope with
focusable observation tubes, they can be used to align the focus. First
bring the image into focus on the camera display, then look through the
eyepiece and focus the image.
If your microscope is not equipped
with focusable observation tubes, but does have eyepieces with dioptre
adjustment, then the focus can be aligned using them. Bring the image
into focus on the camera display, then look through your eyepiece and
focus the image using the dioptre adjustment
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