Sometimes you get plain lucky in multiple ways, enabling you to complete a hack that would otherwise have seemed improbable. [Mario Nagano] managed to attach a vintage 1950’s lens to a modern mirrorless camera (translated from Portuguese).
Photographers tend to collect a lot of gear and [Mario] is no exception. At a local fair in Sao Paolo, he managed to pick up a Voigtlander Bessa I – a bellows camera (or folding camera). It came cheap, and the seller warned him as much, commenting on the bad external shape it was in. But [Mario] had a sharp eye, and noticed that this was a camera that would have remained closed most of the time, due to its construction.
Inspection showed that the bellows was intact. What excited and surprised him was the excellent Color-Skopar objective mounted on a Prontor-S trigger, which is considered premium compared to the entry level Vaskar lens. His plan was to pick up another Voigtlander Bessa-I with a better preserved body, but the cheaper lens and do a simple swap. He never did find another replacement though. Instead, he decided to fix the excellent vintage lens to a DSLR body.
He’d read about a few other similar hacks, but they all involved a lot of complicated adapters which was beyond his skills. Removing the lens from the vintage camera was straightforward. It was held to the body by a simple threaded ring nut and could not only be removed easily, but the operation was reversible and didn’t cause any damage to the old camera body. The vintage lens has a 31.5mm mounting thread while his Olympus DSLR body had a standard 42mm thread. Fabricating a custom adapter from scratch would have cost him a lot in terms of time and money. That’s when he got lucky again. He had recently purchased a Fotodiox Spotmatic camera body cap. It’s made of aluminium and just needed a hole bored through its center to match the vintage lens. There’s no dearth of machine shops in Sao Paolo and it took him a few bucks to get it accurately machined. The new adapter could now be easily fixed to the old lens using the original 31.5mm ring nut.
The lens has a 105mm focal length, so the final assembly must ensure that this distance is maintained. And he got lucky once again. He managed to dig up a VEB Pentacom M42 macro bellows from an old damaged camera. Was it worth all the effort ? Take a look at these pictures here, here and here.
[Robb] has had a little experience making lenses from scratch. His first attempt was for a DIY projector, and while the lens was a little blurry, it did work rather well for something carved out of a block of acrylic. Now he’s taking his experiments with lenses even further with DIY optics that turn everything into a funhouse mirror.
There were two techniques tested while making these lenses. The first was the old standby, CNC milling. A piece of acrylic was put in a CNC and carved with a 1/2″ ball mill. The second technique was 3D printing on a very fancy and very expensive Objet Connex 500. Neither of these methods produce a ready to use lens; to get a finished lens out of the machined or printed objects, [Robb] had to wet sand with 240, 320, 400, 600, 1000, 1500, and 2000 grit sandpaper. After a few hours worth of sanding, the parts were polished with a scratch remover.
Making a lens like this isn’t really that novel – it’s basically the same way lenses have been made for 500 years. The real trick here is making funhouse mirror style lenses. These lenses were created by raytracing in Rhino and Neon. It’s tricky; the index of refraction for acrylic is a little lower than glass, and the refraction for 3D photoresin is a bit higher than glass.
With those models in hand, it’s a relatively simple matter of making some very cool and very strange lenses.
Lumographic images are those patterns you see at the bottom of swimming pools. When water works as a lens, the light patterns of bright and dark are random and wandering based on the waves above. [Matthew] figured out a way to create fixed images from lens shape alone. The images only morph into view clearly when light shines at the proper angle. At near angles an eerie fun-house mirror effect appears, but too far off and it scatters unrecognisably.
The exact method for designing the optics is not explained, though we are sure someone in our readership could figure it out. The artist claims it to be a hundred year old million-variable math problem. The lenses are often quite thick and do not resemble much of anything. The effect however, is sharp, clear and detailed.
At first he suspected he needed astronomically-expensive military-grade 50 nanometer (0.000002″) precision machining for the lenses, but some friends in the autobody industry gave him a few tips to squeeze good enough accuracy from more affordable industrial machines. The technique also allows for images to appear from mirrors and internal reflections. It is probably not something you can 3D print or machine yourself, but it would be interesting to see someone try.
[Matthew]’s work is on display in the “Composite” gallery at the National Museum of Math in New York (MoMath). See the video after the break for a peak at the machinery he uses to manipulate the lenses to enhance the visuals in the exhibit.
Continue reading “Lumographic Images Created With Lens Only”
There are some types of projects that we see quite often here on Hackaday; 3D Printers, Development Boards and Video Game Hardware to name a few. Once in a while we see an optics-based project but those use pre-made lenses. [Peter] felt it was time to give home lens manufacturing a shot and sent in a tip about his experience.
The typical lens manufacturing process starts off by taking a piece of glass and manipulating it into a rough lens shape, either by removing material or heating the glass and forming it in a mold. These lens blanks are then lapped using progressively finer grits of abrasives until the final lens shape and surface finish are achieved. The tool used to lap the lens is very specialized and specific to one lens contour shape. This lapping process can be very time consuming (and therefore expensive) depending on the quality and size of the lens being made.
Continue reading “One Small Step For Magnification, One Giant Leap For Home Lens Manufacturing”
We can’t see much without our glasses (which is why our habit of shaving in the shower often ends badly). Our glasses cost a bundle, but we wear them every waking moment so it’s worth it. But only recently did we break down and spring for prescription sunglasses. However, when it comes to sports we don’t pony up the dough for dedicated specs. Here’s a hack that will change that. If you’ve still got your last set of glasses on hand hack up the lenses for swimming goggles or other applications.
In this case [Dashlb’s] lenses were already small enough to fit in the goggles. He simply added a bead of Sugru around the edges to hold the lenses in place. But if you do need to cut them to size aligning the lenses with your eyes is important, so we suggest the following: have a buddy stand in front of you and mark the center of your pupil on the glasses, as well as the goggles. If you need to cut down the lenses (which are probably a type of polycarbonate) just make sure the marks match up before doing any cutting.
We might give this a try with some wrap-around sunglasses to make an inexpensive pair of prescription cycling shades.
[Chris Gammell] tipped us off that he’s building an online training program for learning electronics. The ten session course will cost money to take but you can get the goods for free if you’re one of the beta testers. We love to listen to The Amp Hour podcast which is just one of [Chris’] many endeavors.
Did you buy a Chromecast this week? We did, but we don’t have it in hand yet (ordered through Amazon). You can still get a look inside from the iFixit teardown.
Practice your Processing skills by using it to code a game of Pong.
A bit of lighter fluid and a hacked insert will get you a flaming wallet. We guess this is a different type of an anti-pickpocket device. [Thanks Stephen]
[Brain] used a $1.50 magnifying lens to help his Raspberry Pi camera module read QR codes better.
We really like [Aaron Christophel’s] LED matrix clock (translated). He started from a marquee that must be at least a decade old. He stripped it down and figured out how to drive it using a Sanguino as a controller.
Glass work is always a feast for the eyes, especially when it is hot glass. Watch as a Nikkor lens is made from beginning to end. It is wonderful to see the care taken to search by eye for defects, refraction issues, clarity etc. It may just be for the video, but it seems that the workers truly do take pride in their product.
What I found somewhat surprising was the amount of work that went into refining the glass BEFORE it was even put into a lens mold. I would have assumed that much of the work would have come after.