Click On The Icons To See Our Pages

Get Updates Straight To Your EMail!


LENS HACK: Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount


Olympus F.Zuiko Auto-S 50mm f/1.8
Olympus F.Zuiko Auto-S 50mm f/1.8



23 May 2017

Today, I found myself this beautiful Olympus F.Zuiko Auto-S 50mm f/1.8. Very lovely mini pancake lens. It's so tiny, it's just about half the size and weight of my other 50mm's!

This is my first ever Olympus lens. The reason I really bought it was to study its anatomy and convert it into a Nikon mount. The great thing about OM mount is that it only has a difference of 0.5mm in flange distance from Nikon's (OM=46.00mm, Nikon=46.50mm). I shouldn't have any problems with the rear part getting too far from the sensor.

Nikon has the longest flange distance registration of current DSLR mounts. That's why, all other SLR mount lenses (Canon EF, Canon FD, Minolta/Sony A mount, Minolta MD, Pentax K, M42, Konica AR) won't be able to focus to infinity on Nikon SLRs, it becomes near-sighted.

While Canon DSLRs can use adapters for OM, P/K, M42 and Nikon F without problem, Nikon needs an adapter with an optical glass to compensate. The problem with adding optical glass is that it can introduce a little softness (not discernible, from my experience), darken the lens by one stop (when you're at f/2, the lens darkens to f/2.8), and also slightly make the focal length tighter (eg. 28mm becomes 35mm).

Which is why I do these lens conversions in the first place -- no optical glass, no effect on image quality.

The Olympus F.Zuiko Auto-S 50mm f/1.8 is my first ever Olympus lens, I have no idea what the parts inside look like and how they operate. It was a gamble and a risk. Good thing is, the design was pretty straightforward so one can easily figure things out (in comparison, the Canon FD's are my worst nightmare!).

From my experience, I can tell you that this one of the easiest lenses to convert. It only took me 3 hours, not being familiar with its design!


Please check out my photo album here:


========================================

The first step was to clean up some of the fungus and haze inside. In order to remove the metal part that holds the glass, I had to remove the name ring first using a spanner wrench.

Olympus F.Zuiko Auto-S 50mm f/1.8



Once that is out, I can now take out the part that holds the aperture ring in place. Be careful, there's a tiny ball bearing that makes the aperture ring to click. Don't lose it! Just put it on the rear cap of the lens to keep it from flying away.

Afterward, I also took out the focus ring rubber and the focus ring itself. I can now brush the focus ring, aperture ring, and name ring with detergent to remove the gummed up dust on the surface and also to whiten the markings.

Now put them all back together after drying, so we can proceed further. Take off the mount of the lens. Place the screw on the rear cap to keep them from going somewhere.

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount



Inside, you can see the focusing helicoid. It was very tight and could use some lube. After wiping off original gummed up lube and replacing it, the focusing helicoid is now smooth as new.

You will see that there is a lever that depends on the original mount's 'Depth of Field Preview Button'. This is what makes the blade to close to its preset value. In its current position, and without the original OM mount, it will always stay open.

You will need something to keep it locked. This where your resourcefulness comes in. You don't need any special material, just anything that can hold it in place. I have one defective spring which I've stored for emergencies like this. That spring helped to keep that lever in place.

Afterward, I also put a drop of superglue under that lever to permanently keep it in place. Be careful not to let that glue seep in to other parts, or else you'll end up with unnecessarily stuck up mechanisms. In case you do, just grab a cotton bud, dab it with acetone and wipe it off.

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount



Our next problem is to put a plastic Nikon mount as a replacement to the original OM mount. The positioning of the screws are not the same, so you will need to locate the exact position and drill a hole on the Nikon mount. It won't be the most pleasant look, but this will get the project done.

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount



Next to the last step. Get the original OM mount again and put if back, don't screw it. Now take it off and put the Nikon mount. Can you measure how many millimeters the Nikon mount adds? Do you remember the flange distance difference? (OM is 46.00mm, Nikon is 46.50mm) Once you've taken the precise measurement, we can now move to the final steps.

Remember the measurement you made? Take for example, if the Nikon mount adds 1mm to the total height compared to the original OM mount, add to that the 0.5mm difference in flange distance. This will give you 1.50mm to adjust.

That means, you will have to unscrew the rear group of glass so that it will raise up and be closer to the sensor when mounted, in order to achieve infinity. Keep rotating the group until you can measure that it has moved up by 1.50mm.

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount



Mount the newly converted lens to your Nikon camera. Point your camera toward the clouds in the sky. Turn the ring to infinity. Are the clouds in precise focus? If not, adjust the glass again accordingly. If it is precise, you can add a drop of super glue to the pitch of the rear glass so it will stay in place.

Now you have an Olympus F.Zuiko Auto-S 50mm f/1.8 lens in Nikon mount. I hope that by sharing my studies here, you can also learn. (I'd appreciate if you can subscribe to www.youtube.com/RattusChoki) Enjoy your new lens! =)

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount



========================================

Samples


Nikon D5200
Picture Profile - Standard, Portrait (my selfies)
White Balance - Cloudy


Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount
f/1.8

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount
f/1.8

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount
f/11

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount
f/1.8

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount
f/4



Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount
f/1.8

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount
f/11

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount
f/11



These samples are unedited and you can see
the consistent quality from f/1.8 to f/16

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount

Olympus F.Zuiko Auto-S 50mm f/1.8... Converting OM To Nikon Mount



Please check out my photo album here:




# # # E N D # # #



0 comments :

Post a Comment

 

About me

The Nikon D5200 as my weapon of choice.

Vintage lenses are my poison.

Kindly hit on the blue CONTACT button at the lower right corner of this page to get in touch for collaboration.


Google+ Followers

FB Feed

Blog Archive

Contact Form

Name

Email *

Message *