I’m going to be testing the following macro lenses over the next couple of weeks: Sony 90mm f/2.8 FE Macro Leica 100mm f/2.8 Apo Macro-Elmarit-R Zeiss 100mm f/2 Makro-Planar ZF Nikon 105mm f/2.8 Micro-Nikkor G VR and, added as the test progresses, the Coastal Optical 60mm f/4 UV-VIS-IR To see all of the posts in this… [Read More]
Restricting yourself to one lens vendor
Those of you who have been reading this blog for a while have probably figured out that I have a catholic attitude towards lens selection. Yesterday on DPR there was an opportunity for me to bloviate on the subject. Here’s what I had to say to someone who wanted to use only one brand of… [Read More]
Towards a macro MTF test protocol
I’m thinking about doing a report comparing several 100ish mm macro lenses, and I need a protocol to do modulation transfer function (MTF) and longitudinal chromatic aberration (LoCA) testing. I find it much more fun to devise new protocols than perform the old ones, so I jumped at the chance. I can’t use any of… [Read More]
Sensor MTF with a perfect lens
To a first approximation, the modulation transfer function (MTF) curve for a given lens and a given sensor is the product of the MTF curve for the lens alone times the MTF for the sensor alone. But how do you measure the MTF of a sensor with a perfect lens? You don’t. You simulate it…. [Read More]
A book report — varnish options
This is a continuation of a series of posts that I started what seems like a long time ago about getting a book designed and published. The series starts here. We’ve agreed that we’re taking the page stock from 100 pound text to 65 pound cover, which will, we hope, pull the book flatter, and… [Read More]
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