Re: Extension Tubes

From: Ryan Marino (email suppressed)
Date: Mon Mar 31 2008 - 04:15:40 PDT

Thanks for the information.

My interest in extension tubes actually stems from reading an interview with Nathaniel Dorsky. I think it might be interesting to experiment with them once I get the formulas down. Seeing the side of a quarter or your finger take up the full size of a frame seems insane!

"k. a.r." <email suppressed> wrote: .hmmessage P { margin:0px; padding:0px } body.hmmessage { FONT-SIZE: 10pt; FONT-FAMILY:Tahoma } Also see the Lenny Lipton bible for a very easy to use mathematical formula for changing your fStop.
Glad to see someone is still interested in this very analog stuff.

(I love the extension tubes, you can make anything, even your thumb look HUGE!!!!!!
that's pretty weird to see, BTW, your thumb projected 30feet wide.)

Kristie Reinders, B.F.A.
Director of Cinematography, Electric Visions
Curator and Head Projectionist, Electric Mural Project
The Mission, San Francisco, CA

'A first class technician should work best under pressure.'
- - - Issac Asimov

Date: Sun, 30 Mar 2008 20:18:30 -0400
From: email suppressed
Subject: Re: [FRAMEWORKS] Extension Tubes
To: email suppressed


There are various sets of extension tubes for sale at Chambless, and they're reasonably inexpensive. They do allow you to focus right up on something, so that the edge of a quarter (for ex.) fills the frame. They're pretty great fun. One word of caution: make sure to adjust your exposure to compensate for the extension tubes. They take a big bite. Here's one place where you can find an explanation of the exposure compensation you'll need to do:

Good luck!

On Mar 30, 2008, at 10:52 AM, Ryan Marino wrote:
Anyone know where one might be able to obtain extension tubes for c-mount lenses?

I've never used them, but understanding is that when using extension tubes on a lens you can focus the lens in more closely?


-Ryan Marino

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