Author Topic: Adventures in Macro-Land with a broken 25/1.4 C-mount lens (Read 1154 times)

Jason C · « **on:** December 07, 2011, 12:58:12 PM »

Equipment: Run-of-the-mill cheap 25mm f/1.4 C-mount lens.
Issue: Very tight focus twist.
Action taken: Dis-assemble lens and carefully Dremel some interior surfaces of lens barrel.
Action result: Did the trick.
Action side-effect: Lens does NOT re-assemble to original state.
New Role: The focus portion of the lens barrel will un-twist 7mm, thus creating a 7mm extension.
Result of new role: My new Mu43 Macro lens...sort of.

Examples:
Not intended to be a crispy macro, but only to illustrate the closer focusing of this lens extended 7mm.

Regular focus, MFD...about .35/meter

7mm extension, MFD...closer than .35/meter

The lens in normal state:

The lens at maximum extension:

"Real" images to come later...

Jason C

voyager · « **Reply #1 on:** December 10, 2011, 04:37:46 PM »

Leads to an interesting effect, I must say. I like the photos.

cosinaphile · « **Reply #2 on:** December 10, 2011, 10:09:16 PM »

you may find wonderful , unusual uses for your 'mod '

cool

Jason C · « **Reply #3 on:** December 13, 2011, 09:43:56 PM »

I do plan on trying this out in actual macro territory, just been really busy at the moment. Also, I need to rig a tube to slap on the gaping center.

Jason C

Jason C · « **Reply #4 on:** December 27, 2011, 07:59:02 PM »

Not particularly quality macro, but it is rather cheap...

E-P1
Fujian 25/1.4, modified
1/40th sec
f/5.6
iso 400

total extension, 7mm

Jason C

Adventures in Macro-Land with a broken 25/1.4 C-mount lens