SeldomPerched
Well-known member
A general set of questions and so no special reason to put them in the Zeiss forum except it was a Zeiss binocular I was just reading about: the 54 HTs, which received a lukewarm reception compared with its 56mm FL predecessors some years ago. On the other hand that has reminded me that I have a Leica binocular that might fit the question also.
Often mention is made of sample variation in binoculars and reviewers and users will talk of cherry samples and lemon samples - no idea why lemon is used to mean bad but there you go; that's another question.
We know that tolerances exist because absolutely identical assembly is presumably impossible or not cost-effective. My questions are:
-with so-called lemon samples, what are the aspects that bring about the undesirable reduction in quality? Is it faulty assembly, is it defects in the dimensions of the glass surfaces, could it be poorly ground glass {I would assume that glass production even of aspherical surfaces is computer-controlled and/or blank press technology (is this right?)}, is it simply sometimes insufficently clean glass surfaces, or are packaging and transport responsible for a loss of accurate adjustment in transport?
-can a poor sample always be brought up to standard by return to the factory for adjustment and reassembly?
-is a weaker sample usually capable of being 'cherrified' by recollimation?
Of course I am not talking here of generally inferior designs but of designs that are represented by excellent samples as well as some not so good.
Thank you,
Tom
Often mention is made of sample variation in binoculars and reviewers and users will talk of cherry samples and lemon samples - no idea why lemon is used to mean bad but there you go; that's another question.
We know that tolerances exist because absolutely identical assembly is presumably impossible or not cost-effective. My questions are:
-with so-called lemon samples, what are the aspects that bring about the undesirable reduction in quality? Is it faulty assembly, is it defects in the dimensions of the glass surfaces, could it be poorly ground glass {I would assume that glass production even of aspherical surfaces is computer-controlled and/or blank press technology (is this right?)}, is it simply sometimes insufficently clean glass surfaces, or are packaging and transport responsible for a loss of accurate adjustment in transport?
-can a poor sample always be brought up to standard by return to the factory for adjustment and reassembly?
-is a weaker sample usually capable of being 'cherrified' by recollimation?
Of course I am not talking here of generally inferior designs but of designs that are represented by excellent samples as well as some not so good.
Thank you,
Tom