Backfocus Plug Revisited

[Joe Kocsis]

There was mention on someone starting to possibly sell these.. I've looked around and come up empty.. So I designed my own, both based on the design in the sticky thread...

Here are two prototypes that I built....

Built into the smallest and best looking plug I could find, to make it look it pro, make it sturdy, and keep it as out of the way as possible..

The two are based on a 1k pots.. 1 is a 20 turn pot which seems to be more accurate than necessary, and may be replaceable with something larger to get a wider range.. and the other is a 1k single turn pot. The insides are epoxied to insulate and keep the components safe from breakage. I was worried the 1K single turn might not be accurate enough it seems to work well. If there's interest I may build a few of these for resale..

I am using a Brevis, but I can custom build to meet a specific focus range on the HVX for other adapter..
Tx..

Joe

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[Jason Miller]

cool,can you take a few pics of it opened up?

 

[Joe Kocsis]

Once they're screwed together, they're sealed for life I'm afraid... The epoxy bonds to sleeve of the plug, I haven't bought extra parts yet... But it's just a resistor and a pot.. as in the sticky backfocus thread... not a lot of room in there, so I used a single 3K 1/8watt resistor.. Which unless I hear otherwise should be fine, since it wouldn't make any sense to have any kind of current running through it.. gives me a range of MF8 to MF12.. My setup is at the edge of MF9 and MF10...