Marianne Oelund

What shape are eyeglass lenses, while they are being molded, ground or polished?  I am fairly sure that cutting to shape for fitting the chosen frame style must be a final step, as there are ...

Not a testing issue.  Focus doesn't matter. Regardless of how this lens is focused, it will not yield a sharp image across the frame.

The check only takes a minute or two.  If adjustment is needed, that will take a little longer, as you will need several checks. My usual shooting situation where I am checking AF, is skaters ...

I think this coating improvement comes rather close to revolutionary (AI 105/2.5 and AI-s 105/2.5): I should also mention that cut-in of SIC coating does not always coincide with changeover from AI ...

How close is your close-up work?  The 105/1.4E isn't what I would consider to be a close-up lens, and it doesn't like extension tubes, if you were considering that approach. What is it about your ...

Lens shape isn't strongly related to the shape of the captured image.  Along much of the optical path, there is no image focus and the shape of the lenses doesn't project onto the image plane (or ...

Optimum tuning would produce a value that is well centered within the condition-dependent error range. Sub-optimal tuning could end up with an FT value at one extreme end of the range, from which ...

It is challenging to write descriptions in manuals which are completely unambiguous to all readers. I've checked the independence from default setting for a number of cameras, including my D800E. ...

The default setting has no effect on lenses which have a fine-tune value entered specifically for them, as was the case for the OP.

Here we go again. Folks, you've got to understand: The best that you can derive from the most robust and controlled procedure, is to end up with a FT setting that reduces average AF errors in the ...

Since 2004, I've taken nearly 6 million frames with CF cards.  That involves literally thousands of insert/remove cycles, with cameras from D2Hs to D5. Not a single bent pin has occurred in my ...

It is definitely not performing normally, and needs service.  Something is seriously out of alignment.

That would be giving Ken far too much credit for linguistic flair.

Condensation would have to be extremely heavy, in order to leave any permanent effects, at least to the point of visible droplets appearing.  I've had some condensation in the past, but it cleared ...

At f/5.6 it would probably be hard to tell, but certainly at wider apertures, they are hardly similar.  The Voigtlander has strongly over-corrected SA while the 60D is typical of macro lenses and ...

It is design, not luck:  The first 70-200 to incorporate a fluorite element did not happen by chance. The goal for that lens was to incorporate VR and achieve more consistent IQ across the frame, ...

The size of the lens objective (front element) is important for light gathering, but in the case of zoom lenses, you only utilize the full objective size when zoomed to the longest focal length. ...

Nikon's MTF data is not from measurements.  They are calculated from the nominal design, for subject at infinity, thus the MTF curves truly represent what the lens design is capable of, without ...

In some respects yes, but condensation produces random scattering which lacks any direction. This severe aberration is quite directional, with a sharp edge to bokeh circles at the bottom and very ...

Before I saw this post, I was wondering if the issue you were describing in your opening post was associated with background blur. Although lenses are always linear in terms of the image brightness ...