Is one of these objectives considered optically better and why? Leitz PL 40/0.65 170/0.17 vs Leitz NPL 40/0.65 170/0.17.
Thanks,
henryr
objective comparison
Re: objective comparison
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Last edited by EYE C U on Sat Jan 23, 2021 2:16 am, edited 1 time in total.
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Re: objective comparison
Regular Leitz achromats: Planar to 18 mm field of view.
NPL = Normal Plan: Planar to 20 mm? field of view, e.g. SM-LUX.
Pl: Planar to 28 mm field of view, e.g. Orthoplan.
NPL = Normal Plan: Planar to 20 mm? field of view, e.g. SM-LUX.
Pl: Planar to 28 mm field of view, e.g. Orthoplan.
Re: objective comparison
Hi together,
I think the Leitz standards of "planar" have changed over the years so the genereation of objective has to be taken into account. The first planar objective series from about 1960 consisted of fairly plain looking objectives with highly reflective chrome. This was pre-Orthoplan, so no need for extremely wide fields. I think when the Orthoplan came out there still were objectives in this look but for wide fields. The later objectives had a rotatable collar with the objective label. I'm not able to give exact values for every objective but for some types:
NPL means near planar, but by Orthoplan standards! This was plan over 24mm field. But it didn't mean fluorite. But there were NPL Fluotars, which were fluorites.
PLAN means planar by Orthoplan standards, 28mm
The objectives of the last finity type were available in 170mm and 160mm labeling. I have a pair of these ant they are the same in this case.
Bob
I think the Leitz standards of "planar" have changed over the years so the genereation of objective has to be taken into account. The first planar objective series from about 1960 consisted of fairly plain looking objectives with highly reflective chrome. This was pre-Orthoplan, so no need for extremely wide fields. I think when the Orthoplan came out there still were objectives in this look but for wide fields. The later objectives had a rotatable collar with the objective label. I'm not able to give exact values for every objective but for some types:
NPL means near planar, but by Orthoplan standards! This was plan over 24mm field. But it didn't mean fluorite. But there were NPL Fluotars, which were fluorites.
PLAN means planar by Orthoplan standards, 28mm
The objectives of the last finity type were available in 170mm and 160mm labeling. I have a pair of these ant they are the same in this case.
Bob