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Active Member
- Joined
- May 8, 2013
- Messages
- 274
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- Country
- Australia
After waiting so long for the Mobius "C" I ordered from Banggood to arrive that I thought it just might never show up it arrived on Saturday and I've been putting it through its paces.
I haven't been able to determine if it has any heat related focus issues as yet but compared to my other Mobi I was not happy with the apparent mechanical focus of the lens as delivered to me. I decided to do a standard manual focus adjust using the camera in web cam mode on my computer monitor so that I can be satisfied the focus is as sharp as possible before I do any further testing.
Immediately, I ran into the same problem others have reported here that once you loosen the hex set screw and try to turn the lens it just won't hardly budge. It takes quite a lot of force holding the lens between the thumb and the forefinger to twist the lens at all. The best I could determine was that the threads were not stripped or damaged and the set screw was not over-tightened, it's just a pretty tight fit. It seemed I could sort of twist to focus the lens this way but now my hand was in front of the lens so that I couldn't see anything on my monitor to focus on. Hmm, so what to do?
I know.....Pliers!....that's it! No wait, wait!.......that could really do a number on this thing. So after about 15 minutes of rummaging through various drawers, boxes and shelves in my studio, office, workshop, basement and kitchen I finally found exactly what I was looking for. It was the ribbed rubber insert from a handlebar type camera mount. It fit the mouth of the pliers perfectly without modification and it did an excellent job of securely, firmly and safely twisting the Mobius C lens for focusing. You know, it's a funny thing around here, if I dig deep enough I pretty much always come up with that obscure part I'm looking for to continue whatever harebrained scheme I'm into at the moment. This time I couldn't have found a more perfect part for the purpose if I had spent all day searching for the right thing online.
Anyway, the lens threads seem fine BTW and they loosened up a bit as I worked the focus back and forth. So far I am not a big fan of these composite FRP lens mounts but I can report that I am much happier now with the focus on my new Mobius C.
If you try anything like this just remember to be gentle and don't force anything......Well, maybe just a little.
I previously tried a similar method except with some nitrile sheet and all that happened for me was that the lens ring came undone.
Once I get the replacement module installed and verify that the "swarf" isn't an issue I'll try removing the lens ring completely and having another go.