Perfect distance between Sigma LSA and microscope lenses=?
Moderators: rjlittlefield, ChrisR, Chris S., Pau
Perfect distance between Sigma LSA and microscope lenses=?
Hello everyone,
Does anybody know the perfect distance between the Sigma Life-Size Attachment and the microscope lens?
Is it constant for all microscope lenses e.g. NIKON BE Plan 4x (RMS) and NIKON LU PLAN 5x (25mm) ?
BR, ADi
Does anybody know the perfect distance between the Sigma Life-Size Attachment and the microscope lens?
Is it constant for all microscope lenses e.g. NIKON BE Plan 4x (RMS) and NIKON LU PLAN 5x (25mm) ?
BR, ADi
I don't have experience with the Life Size Adapter, but I have played a bit with varying the distance between objective (or reversed prime) and tube lens, and I think there is no single right answer, and that it varies from lens to lens. What I have seen is that some kinds of aberrations are minimized by short separation distances, and others are minimized by long separation distances.
So I think we need to test it ourselves for our particular combinations of lenses.
So I think we need to test it ourselves for our particular combinations of lenses.
That distance is not critical: this is one the advantages of infinite systems over finite, because the rays are parallel the infinite system allows for more flexibility and to put flat optic elements at the infinite space without altering the properties of the system.
The best point for an specific objective and non official tube lens can only be established by careful tests.
In principle this distance would be the same for the same kind of objectives like in the microscope when you change them
I got the Sigma but still waiting the adapters to test it, don't expect much, I'm not a good tester like other members
The best point for an specific objective and non official tube lens can only be established by careful tests.
In principle this distance would be the same for the same kind of objectives like in the microscope when you change them
I got the Sigma but still waiting the adapters to test it, don't expect much, I'm not a good tester like other members
Pau
Hello Pau, hello Lou,
Many thanks for your hints!
Robert uses the Sigma LSA too but he hasn’t tested any LU PLAN up to now :-)
http://www.photomacrography.net/forum/v ... hp?t=36071
So, I have already tried with 50mm for the LU Plan 5x / 0.15 and with 100mm for the BE Plan 4x /0.10
BR, ADi
Many thanks for your hints!
Robert uses the Sigma LSA too but he hasn’t tested any LU PLAN up to now :-)
http://www.photomacrography.net/forum/v ... hp?t=36071
So, I have already tried with 50mm for the LU Plan 5x / 0.15 and with 100mm for the BE Plan 4x /0.10
BR, ADi
Last edited by Adalbert on Tue Jan 16, 2018 6:36 am, edited 2 times in total.
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Hi,
The distance does matter.
It can obviously be too long, leading to vignetting.
It can also be off (too short or too long) because of the complex interplay between objective and tube lens. Both are usually complex lens systems. So it would be better to say "distance doesn't matter within a specified range."
For example, for Nikon CFI60, the distance is 100-200 mm https://www.edmundoptics.com/images/catalog/7257.gif
Olympus UIS it's 50-170 mm www.olympusamerica.com/seg_industrial/f ... _guide.pdf
and Zeiss ICS has different tube lenses (different lens diameters!) for different setups.
The distance does matter.
It can obviously be too long, leading to vignetting.
It can also be off (too short or too long) because of the complex interplay between objective and tube lens. Both are usually complex lens systems. So it would be better to say "distance doesn't matter within a specified range."
For example, for Nikon CFI60, the distance is 100-200 mm https://www.edmundoptics.com/images/catalog/7257.gif
Olympus UIS it's 50-170 mm www.olympusamerica.com/seg_industrial/f ... _guide.pdf
and Zeiss ICS has different tube lenses (different lens diameters!) for different setups.
Hi,
I have taken some photographs with the distance of 50mm between the microscope-lens and the tube-lens:
http://www.photomacrography.net/forum/v ... highlight=
BTW, the distance between the sensor and the tube-lens can be a little bit different then 200mm but the tube-lens should be focused to the infinity.
BR, ADi
I have taken some photographs with the distance of 50mm between the microscope-lens and the tube-lens:
http://www.photomacrography.net/forum/v ... highlight=
BTW, the distance between the sensor and the tube-lens can be a little bit different then 200mm but the tube-lens should be focused to the infinity.
BR, ADi