วีดีโอ

It should. If you have any friends and family with prescription glasses (unable to see far away), you can try and test by holding them in front of the lens to see if it gets you closer to infinity focus. It is obviously a little bit of trial and error. My brother joked that I should take my camera to the optometrist, which to be honest would actually get you the best result with each lens if they are open to helping you.

I made this video hoping someone else would find the details useful about the 35mm f2. There are not many teardown videos of these lenses, and it is nice to see what you are getting yourself into before attempting. I had to go in blind and hope I could get the thing back together. Whoever originally puts the oil in these lenses probably needs to watch. I imagine the blades work like a sponge once the oil from the other moving parts gets too hot (like in a delivery truck during the summer).

I used an inexpensive UV filter and just a small strip of electrical tape to attach the glass. UV filters are widely available at any size. You may even have one in the attic of a family members house that did film photography.

When mine was stuck, I could at least hear a small clicking noise of the lens attempting to open/close the aperture. This was the gear motor turning but unable to move the blades as the were all gummed up and stuck together. Mine was stuck all the way open. If by chance it is stuck all the way closed with no visible oil on the blades, it may be broken.

It is fun to put on some closeup lenses or a macro adapter to get some macro footage of insects at 120 fps!

I am definitely not a professional, I just enjoy taking things apart. 😁

I had trouble finding videos and was ready to toss my 35mm. So as a last ditch effort when I attempted the repair, I thought I would film it since not much is available. I am not familiar with the 85mm lens, so I am not sure if that repair is similar. Mine was a victim of excess oil causing the blades to stick together. After researching, this is a common problem if the lens has been in a hot environment.

GoPro 10. I have been rather happy with it as it is super stable.

@@thefunofphotography wow, would of never guessed !

I tried some experiments a 135mm f2.8 lens and managed to get one to work. However the images were soft at infinity focus. When it comes to telephoto lenses I think it is more challenging for this to work. It is possible with the right focal lengths but may require some experimentations. The results may not be worth the effort.

@@thefunofphotography Thank you

Much appreciated!

That should work, but I think it would slightly reduce the effective f stop of the lens by a small percentage. Ideally you want a step down ring to prevent applying tape directly to your lens. It is easier to damage a ring than your lens. Also be aware that different focal lengths may require different strengths of a double concave lens. So some experimentation is required if you want infinite focus. A telephoto lens may only focus to infinity if the double concave lens is mounted far away from the front element if it is not strong enough. Macro focusing should still be achievable. Just get a cheap set of double concave lenses to try it out and see what works before finding an expensive set (small ones will work but lower the f-stop for learning what focal distance of the double concave lens works best). I almost wanted to buy a set of cheap lenses used by an optometrist to do further experimentation with this!

@@thefunofphotography thank you for helping me. I loved the photos you took with this set.

Much appreciated!

indeed!!!

Using a GoPro, I found an adapter that allows me to put my 58mm diopters (usually for my Canon lenses) to get some nice 4K 120 fps close ups of the bees!

Sombrero is a good idea! 🙂

It has been a fun lens, and the flange distance on a Canon (or Nikon) would limit it to close up photography. I am hoping to get a mirrorless in the future that will allow this lens to have native infinite focus (I tried it on a friend's Sony and it worked great).

Thanks!

I have been enjoying the Minolta MD lenses. One day I hope to get a mirrorless camera so I can adapt them better!

Get it. Or the Celtic version. Amazing lens for the price. About 40 bucks. Of course, the right ebay seller and the right lens. Be sure to find out just how good it is on a tripod.

@@sclogse1 There's a Celtic MD I purchased for $30 because of a fungus problem, which'll be real easy to clean out once it arrives. May be not the most ideal, but hey, I'm getting this amazing lens for much cheaper than the current listed prices. Am a huge fan of the Rokkor-X 200mm f/4, just hate carrying around something that isn't light or compact (since mine is also a Q version).

I believe it was a small phillips (+) screwdriver. Before removing the screws you will likely have to remove some glue that fills in the top of each screw if this is the first time the lens has been opened. Here is another video that shows someone doing that with a razor blade: th-cam.com/video/fjVr0IwJyd8/w-d-xo.html

@@thefunofphotography Tks for the tips

The science lenses I ordered using www.amazon.com/gp/product/B07Z3CVFMB/ and I taped it to a UV filter with electrical tape.

@@thefunofphotography Thank you! is there any size you advise me to buy?

@@Tensai0 You will want to pay attention to the filter size of whatever lens you want to do this experiment. The Minolta lens I first tried this on has a filter size of 50mm, so I got a 50mm set of science lenses. I later tried it on a lens that has a 58mm filter size using a step down ring, and it still worked just fine.

Thanks for taking a look!

lucky to see you here wow!