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Patrick Fee

Member Since 12 Aug 2015
Offline Last Active Feb 21 2017 11:31 AM
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Posts I've Made

In Topic: Chimera ring adapter

21 February 2017 - 11:21 AM

 

The outer diameter is 7.5" and 7" inner diameter.

 

Thanks for the info.


In Topic: First follow focus - bumpy operation. Help!

18 February 2017 - 09:10 AM

Gear pitch does not change with diametrical pitch or pitch diameter.  If the pitch changes than the gear is cut incorrectly.


In theory it shouldn't but since he's talking about a strap with gear teeth on it instead of a continuously geared surface it does. The teeth shape stays the same but the valleys between them is different depending on the diameter of the lens it's wrapped around. It may not be a whole lot but consider the difference between laying the strap completely flat vs wrapping it around something the size of a quarter. The distance between the teeth stretches out the smaller you go.

In Topic: First follow focus - bumpy operation. Help!

17 February 2017 - 11:24 AM

I agree with with Kyryll.  I used to work for Zacuto and I know their follow focus will pull in toward the lens gear when you tighten it down.  Try to leave like a half mm or so and watch the gap between the gears close when you tighten everything down.  

The strap type of gear could be a problem too if its cheap and bumpy.  Also, the pitch (distance between the peaks) will change slightly depending on what diameter the lens barrel is and could lead to some engagement issues.


In Topic: Chimera ring adapter

17 February 2017 - 10:46 AM

I actually just started working on a new design for a softbox speedring and we're planning on having it somewhat modular to work with different fixtures, stobes and constant lights.  Out of curiosity, what diameter ring would you need to fit the DeSisti light you mentioned?


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