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Author Topic: 20mm f/4 AI conversion  (Read 3874 times)

brent_e

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20mm f/4 AI conversion
« on: September 24, 2016, 02:54:08 »
hey folks,
new here.  thought I'd throw this up as I see a few more similar threads. 
I found this lens for what I thought was a decent price locally.  First I swapped aperture rings with a 24mm 2.8, but the fit wasn't great and I always had to adjust exposure comp.  I finally decided to do a proper job on this.  It's become one of my favourite lenses. 


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richardHaw

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Re: 20mm f/4 AI conversion
« Reply #1 on: September 24, 2016, 03:52:28 »
i love your machine :o :o :o
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richardHaw

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Re: 20mm f/4 AI conversion
« Reply #2 on: September 24, 2016, 03:53:32 »
Nice job, by the way. very clean cut :o :o :o
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Hugh_3170

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Re: 20mm f/4 AI conversion
« Reply #3 on: September 24, 2016, 05:41:08 »
Ah, a proper milling spindle!  Nice to see the aperture ring being machined with the best choice of gear.  Is the three jaw on a rotary table?

Once you learn how to do the Ai conversions for oneself, a whole lot of interesting lens choices from the pre-Ai world become convenient.   ;D   Not quite so good for your bank account however.   ;)
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Hugh Gunn

John Geerts

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Re: 20mm f/4 AI conversion
« Reply #4 on: September 24, 2016, 07:37:10 »
Cool job and impressive detailed photo's.
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Jakov Minić

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Re: 20mm f/4 AI conversion
« Reply #5 on: September 24, 2016, 09:23:57 »
Brent, welcome to NG!
Something tells me from your first post that you will fit in here nicely :)
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Mongo

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Re: 20mm f/4 AI conversion
« Reply #6 on: September 24, 2016, 11:21:08 »
There are a few ways of doing this job but yours  is by far the best Mongo has seen. Nice work, machinery and instructive images.Thanks.
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richardHaw

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Re: 20mm f/4 AI conversion
« Reply #7 on: September 24, 2016, 18:24:19 »
can you please show us a full picture of your milling machine :o :o :o
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brent_e

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Re: 20mm f/4 AI conversion
« Reply #8 on: October 06, 2016, 03:53:37 »
Hey Folks,
thanks for the kind words! 
The three jaw chuck is on a rotary table.  I'll have to look a bit further (or just take one tomorrow) for a photo of the mill.  It's a Gorton tracemaster from 50-60 years ago!  The original CNC!   haha!


thanks again

Brent
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brent_e

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Re: 20mm f/4 AI conversion
« Reply #9 on: October 06, 2016, 23:11:24 »
There's the old mill and lathe. 
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