Posted 04/23/2013 5:00 pm
The 3xMM was the standard objective that came with the Nikon Measurescope MM20. You could also get a 1x, a 5x, 10x, 20x, and 50x. They were parfocal so you could swap them out and stay reasonably close in focus. I purchased a 1x on ebay a while back but had to return it due to undescribed scratches and coating problems. I own a 5x and use it for variety shots, and a 10x which I have not even tried yet. I can highly recommend the 3x and 5x for variety imaging. Their working distance is as much as the 75ARD1 (!!) which makes lighting super easy. Usually lighting is starting to be a problem at 5x, but not for these objectives.
As the 'Cap says, they are also telecentric. When stacking in CZP, the program notes the scale and xy offset values for each pair of images in the depth map. When using the 3x or 5x MM objectives, the scale factor is always 1.000 because the magnification does not change vs focal plane adjustment. This eliminates the need for the program to scale the images to line them up. This in itself may be an explanation as to why this objective is so sharp compared with technically-superior competitors. The rescaling/resampling process causes sharpness reduction in the final image.
As the 'Cap says, they are also telecentric. When stacking in CZP, the program notes the scale and xy offset values for each pair of images in the depth map. When using the 3x or 5x MM objectives, the scale factor is always 1.000 because the magnification does not change vs focal plane adjustment. This eliminates the need for the program to scale the images to line them up. This in itself may be an explanation as to why this objective is so sharp compared with technically-superior competitors. The rescaling/resampling process causes sharpness reduction in the final image.
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