Build your own 35mm Follow Focus Gear at DVinfo.net

Go Back   DV Info Net > Special Interest Areas > Alternative Imaging Methods

Alternative Imaging Methods
DV Info Net is the birthplace of all 35mm adapters.


Reply
 
Thread Tools Search this Thread
Old April 17th, 2006, 07:22 AM   #1
Regular Crew
 
Join Date: Oct 2004
Location: las vegas
Posts: 30
Images: 5
Build your own 35mm Follow Focus Gear

Quick and painless way to build a 35mm Follow focus gear.

Step #1
go to your local hobby shop and buy a 70mm Helicoptor gear.

Step #2

Clip to fit.

Step #3

Place it on your 35mm lens!
Shane Valdez is offline   Reply With Quote
Old April 17th, 2006, 07:25 AM   #2
Regular Crew
 
Join Date: Oct 2004
Location: las vegas
Posts: 30
Images: 5
Also, i'm using the Chrosziel 202-16 Focus Gear Drive - Canon 16x Manual Lens.
Shane Valdez is offline   Reply With Quote
Old April 17th, 2006, 10:50 AM   #3
Trustee
 
Join Date: Jun 2005
Location: Hollywood, CA
Posts: 1,675
Images: 1
The gear is available online for purchase here:
http://www2.towerhobbies.com/cgi-bin...&I=LXLBN7&P=FR

I just ordered three. I will post if this is cine-pitch gearing. If it is, I plan on keeping mine. If they aren't, I'll probably sell them.
__________________
BenWinter.com
Ben Winter is offline   Reply With Quote
Old April 17th, 2006, 06:20 PM   #4
Regular Crew
 
Join Date: Mar 2005
Location: Perth WA
Posts: 103
Where's a good place to buy the gear drive and what is the cost? I searched for Chrosziel 202-16, seems to be 64 euros, is that item number all you need? The full unit was over $1000.
Andy Gordon is offline   Reply With Quote
Old April 17th, 2006, 10:49 PM   #5
Trustee
 
Join Date: Feb 2006
Location: Niagara Ontario Canada
Posts: 1,121
That's the main problem - once you get the gear to go on the lens, you need the gear to turn the lens. Like a chicken in the egg I suppose. Dan was selling one, IndiFocus has one, they just aren't cheap.
David Delaney is offline   Reply With Quote
Old April 20th, 2006, 01:50 AM   #6
Regular Crew
 
Join Date: Oct 2004
Location: las vegas
Posts: 30
Images: 5
Sorry the link was removed, here is the new link:

http://www.dvinfo.net/gallery/browse...3&userid=13126
Shane Valdez is offline   Reply With Quote
Old April 20th, 2006, 09:51 AM   #7
Major Player
 
Join Date: Dec 2003
Location: Brooklyn, NY
Posts: 636
No, the IndiFocus is cheap, at $299. Dan's follow focus is an entirely different product, and almost twice as much, IIRC.
__________________
Realism, anyway, is never exactly the same as reality, and in the cinema it is of necessity faked. -- J-L G
Jim Lafferty is offline   Reply With Quote
Old April 20th, 2006, 01:17 PM   #8
Major Player
 
Join Date: Mar 2005
Location: Ventura, California, USA
Posts: 751
Quote:
Originally Posted by Ben Winter
The gear is available online for purchase here:
http://www2.towerhobbies.com/cgi-bin...&I=LXLBN7&P=FR

I just ordered three. I will post if this is cine-pitch gearing. If it is, I plan on keeping mine. If they aren't, I'll probably sell them.
I don't know what your reasons are for wanting cine-pitch (e.g., maybe you already have a FF with gears that are cine-pitch), but pitch is irrelevant if one uses the same tooth profile on all gears. It won't matter whether your gears are helicopter, cine-pitch, or otherwise. (assuming there's no lash!)

Also, you can simply find out what the pitch is without buying any gears. For that gear for example, you could call or email Helimax.
Bill Porter is offline   Reply With Quote
Old April 20th, 2006, 03:50 PM   #9
Major Player
 
Join Date: Mar 2005
Location: Atwater, CA
Posts: 246
Im not sure if anybody ever thought of this.. but remember when everyone was trying to find good metal 90 degree gear box. you know, one shaft is 90 degree to the other and they both turn inside a gear box. very important peice for follow focus unit. well the problem was they are made, but they are always really expenisive for a metal one and not plastic.

well...how many people use a drill press in here? then youve probally used a chuck key alot also. and did you know that that key is a 90 degree gear also? and what happens if you take 2 chuck keys, and fit them in a little box holder? you get a 90 degree gear box. and it will cost you about 3 bucks
http://www.lowes.com/lowes/lkn?actio...95302-70-U1533

i thouhght of this a week ago as i was working with my drill press. How easy is this!??

eh, eh? do i get a kiss?
Forrest Schultz is offline   Reply With Quote
Old April 20th, 2006, 04:00 PM   #10
Major Player
 
Join Date: Mar 2005
Location: Ventura, California, USA
Posts: 751
Wow, I wish I'd been following the threads about that because I could have helped give something back to the forums. I know a lot more about mechanical stuff than I do cameras.

Those sorts of gears are called miter gears.

http://www.mcmaster.com/catalog/112/...e/6529kp1l.gif

They are available in plastic (molded nylon usually) for about $2-3 a piece in a variety of shaft diameters, tooth counts, diameters, and so on.

Check out mcmaster.com. You could build everything from a follow focus to a space shuttle from that place. Super inexpensively, too. McMaster Carr is heaven on earth.

Have fun!
Bill Porter is offline   Reply With Quote
Old April 20th, 2006, 04:05 PM   #11
Major Player
 
Join Date: Mar 2005
Location: Atwater, CA
Posts: 246
thanx Bill that will help people find alot of gear parts.

The problem with the miter gears on their site is that the nylon ones are cheap. but their steel ones are over 20 and going up. that price sucks, and is not as nearly as cheap as the lowes replacement chuck keys. nylon could be fine, but isnt as durable as steel.

I also have a question. its something that i cant seem figure out.

from what i see on most follow focus's is the handle/wheel, (the wheel with the whiteboard attached) that is linked by a shaft which goes into a 90 degree gear box. The shaft that comes out of the box is attached to a smaller sized toothed gear (usually plastic) which interlocks to the SLR lens plastic toothed gear which is about as big as the diametter of the lens. and then you turn your wheel as it simultaniously turns the 35mm lens. since the slr lens gear(helicopter gear in this case) is large compared the the smaller gear that is on the 90 degree box shaft. How is the gear ratio still 1:1. wouldnt you need 2 gears the same size to get a 1:1 ratio.

or is there another gear involved somewhere that i missed. (note, i know that on professional FF's they have an adjustable extension peice that is pulley driven, that way you can swivel your gear back and forth for differnt size lenses. But i assume that pulley driven extender is 1:1 in itself. so i left it out of my question. to keep things simple)
Forrest Schultz is offline   Reply With Quote
Old April 20th, 2006, 04:18 PM   #12
Major Player
 
Join Date: Mar 2005
Location: Ventura, California, USA
Posts: 751
Nylon isn't as durable as steel, nor does it need to be in this application. You won't ever wear out a Nylon gear in a follow focus since Nylon is a hell of a lot stronger than you even need. In a follow focus it will go through a very low number of rotations in its lifetime, at very low pressure, and very low speed.

Nylon is cheaper, lighter, and easier to work with (in case you want to drill a set screw hole, etc) than steel, and these are things you do want in this application.
Bill Porter is offline   Reply With Quote
Old April 20th, 2006, 04:24 PM   #13
Major Player
 
Join Date: Mar 2005
Location: Atwater, CA
Posts: 246
You are right Bill, that makes alot of sense since steel is a pain to drill or dremel and work with for that matter. thanks
Forrest Schultz is offline   Reply With Quote
Old April 20th, 2006, 04:26 PM   #14
Major Player
 
Join Date: Mar 2005
Location: Ventura, California, USA
Posts: 751
Happy to help!

This place rocks
Bill Porter is offline   Reply With Quote
Old May 2nd, 2006, 10:58 PM   #15
Trustee
 
Join Date: Sep 2003
Posts: 1,435
How's this for a remote-controlled follow focus:

http://www.cameraturret.com/focus.htm
Alex Raskin is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Special Interest Areas > Alternative Imaging Methods

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 03:15 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network