ProfHankD

Yup, I may be a senior Professor, but I can still have a senior moment. :-( All I can say is at least I quickly acknowledge when I say something stupid. ;-)

No, I'm not sure. I stated that incorrectly. That's what I get for posting at 1AM. :-( I actually did shots in both orientations to check, but I forgot to check. I just checked: it is rolling shutter.

My rule is Soligors are cr*p unless they are the C/D (computer designed) ones, in which case they're darn nice... I see the C/D marking on this lens.  :-) Looks a bit more contrasty than my old ...

I've just finished some fairly detailed tests with a variety of shutters... and I'd like to say for the record that mechanical shutters are evil. For example, here's a 1/10000s still from a ...

No, that's not normal at all , although it probably isn't a lens defect -- it's an occlusion artifact. There are infinitely many viewpoints through an aperture, not just two or three or four ...

guyfawkes: Actually, in many ways, ordinary PLA behaves a lot like aluminum. It's quite strong. The catches are:

1. PLA is not naturally opaque. Either pick your color very carefully (ideally, a...

Interesting look to these shots. The bokeh look really nice, except I'm seeing strong double-like artifacting in some places... odd.

How good ergonomics of any well-designed product (and Sony spends a lot on engineering -- they only make well-designed products) are... is always very much a personal judgement call. It also tends ...

As soon as I have a Z lens + body to take dimensions from and check fit, I'm sure it'll be easy -- I've published dozens of free 3D-printable adapter designs. It would be really great if Nikon...

All correct. The 3D-printed adapter I designed has you mount the Kiev 10/15 lens normally, but it twists farther than you'd expect. As you mount it, the internal aperture control feeler engages a ...

Wrong way of thinking about this. A focal reducer basically makes a larger fraction of the total resolution of a lens become useful for a smaller sensor format. It really wouldn't be wrong to think ...

Tough call. Here's my overview of the Vivitar , and it's quite a nice little lens. I don't have the Minolta MD 28/2.0, but I love my MC Rokkor 28mm f/2.5... and, honestly, my MD 28mm f/2.8 is darn ...

Actually, this has been done before primarily for a wide view angle with multiple cameras looking at parts of the sphere. There are better ways to get a fisheye view... although we'll see; perhaps ...

I've done plenty of things reflecting off a shiny ball, but nothing with an optical glass ball. Where did you see one for cheap? Ah. I found them on eBay.  Ordered a 30mm and an 80mm... we'll see ...

Actually, from my experience, it's more build quality than IQ that shoots down for the later Vivitars in general. However, it is true that around the time the original Series 1 lenses were ...

I don't care unless it is severe enough to act like haze. Contrary to what folks say, even tiny bits of dust will show in the bokeh. If you look at the OOF PSF (image of an out-of-focus point light ...

I certainly haven't had any problem that way -- unless it's a macro that isn't generally well-corrected, but only tuned for close-up. Classic example would be the 100mm f/4 SMC Takumar; it's hard ...

For that, although I still think the Tamron 90mm macro is a great all-round choice, I'd probably lean toward a good old (or new) fast 85mm lens for you. The Jupiter 9 is a possibility, but you'd ...

Yeah, the Sandmar gives a pleasing rendering as long as you don't pixel-peep off axis. Then again, it's slow and makes old-looking images. Yup. The one I posted images from here . It's smallish, ...

Diffraction, no, not in the sense of limiting resolution. It does changes things a little in the OOF portions of the image.  Yet another thing to study along with the EFCS deformation of bokeh....