- Location
- Switzerland
- Name
- Matt
Enjoy
M.
Again, it's nothing more than a mathematical joke because I simply couldn't think about anything sensible to say about day 17. It's Gauss's hand-constructed heptadecacon (only ruler and compass) - which he considered his greatest achievement; today, it's considered maths trivia ... Funny that a letters guy like me can only think of maths in this context ... well, it's a number.A seventeen-bladed aperture, what lens is that?
The 7artisans 25mm f1.8 has 12 blades.However, the question is valid. I don't know when they would last have used something as sophisticated as that - I only own some older lenses with 9- and 10-bladed apertures, but I've definitely read about higher counts ...
I'll have to let it rest here, but maybe someone else can chime in
M.
Again, it's nothing more than a mathematical joke because I simply couldn't think about anything sensible to say about day 17. It's Gauss's hand-constructed heptadecacon (only ruler and compass) - which he considered his greatest achievement; today, it's considered maths trivia ... Funny that a letters guy like me can only think of maths in this context ... well, it's a number.
However, the question is valid. I don't know when they would last have used something as sophisticated as that - I only own some older lenses with 9- and 10-bladed apertures, but I've definitely read about higher counts ... Though in even earlier times, the apertures were inserted as boards with circular holes, it seems. In fact, my Agfa Isola II (a super-simple and cheap 6x6 tube camera - a proto-Holga) still works that way: f/11 is just a mask with a hole in it that's flipped into the light path:
View attachment 219294
(Just a quick and dirty attempt to show it, you can just about begin to see the aperture; *not* today's entry by any stretch ...)
I'll have to let it rest here, but maybe someone else can chime in
M.
Really cool, looks like it's getting invaded by UFOs.Day 17: post-midnight nocturnal view of my street
The old house (built in 1902) where I live is on the rural outskirts of what used to be a small Oregon farming town - and even before the silence of the corona virus quarantine, it's always been a quiet place - even more so, at night. But on clear-ish spring nights, I sometimes step outside and just stare up at the stars which, in spite of the ambient light from the nearby town, are usually quite visible. I was doing exactly that, tonight, when it struck me --- why not attempt a photograph.
But it's a very windy night, and though I put the Pen F on a tripod, everything was blowing around tonight - although, looking at the results, it almost seems like the stars are what are being blown about.
View attachment 219301
for being off-topic. So I went through my collection of older bellows and enlarger lenses and alas, I didn't find a lens with 17 aperture blades. Got lenses with 15, 16, 18 blades and my highest count is for the Schneider Xenar 4.5/135mm with 19 blades.Again, it's nothing more than a mathematical joke because I simply couldn't think about anything sensible to say about day 17. It's Gauss's hand-constructed heptatecacon (only ruler and compass) - which he considered his greatest achievement; today, it's considered maths trivia ... Funny that a letters guy like me can only think of maths in this context ... well, it's a number.
However, the question is valid. I don't know when they would last have used something as sophisticated as that - I only own some older lenses with 9- and 10-bladed apertures, but I've definitely read about higher counts ... Though in even earlier times, the apertures were inserted as boards with circular holes, it seems. In fact, my Agfa Isola II (a super-simple and cheap 6x6 tube camera - a proto-Holga) still works that way: f/11 is just a mask with a hole in it that's flipped into the light path:
View attachment 219294
(Just a quick and dirty attempt to show it, you can just about begin to see the aperture; *not* today's entry by any stretch ...)
I'll have to let it rest here, but maybe someone else can chime in
M.
Thanks, I'll use that (the day after tomorrow ...)for being off-topic. So I went through my collection of older bellows and enlarger lenses and alas, I didn't find a lens with 17 aperture blades. Got lenses with 15, 16, 18 blades and my highest count is for the Schneider Xenar 4.5/135mm with 19 blades.
View attachment 219310
View attachment 219311
Image gallery
You can (usually) tell when someone uses a real macro lens. The 60 is a marvel of size, weight, and price.