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Old October 15th, 2002, 10:12 AM   #1
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The Pappas Lens System

Hello all...

We are trying to achieve a very shallow depth of field similar to that of an 85mm prime lens for 16mm/ 35mm cameras. Basically, we want to have our subject 10-15 feet away, & have background fall off to mush, just like a 85mm prime. Per the Pappas System article on the Watchdog site, we have the EF lens adapter, a 15mm EOS lens, and what we thought would work for a .6x wide angle adapter. After assembling these components together, we are finding that we have no more or less depth of field than what we can achieve with the 16x standard lens. Looking at the pictures of the Pappas system, we seem to have all of the "same" components - Except for the .42x wide angle adapter. Our .6x adapter is a Century Optics wide angle add-on glass element, whereas in the pictures of the Pappas system, the .42x adapter appears to be yet ANOTHER LENS barrel. What is that lens adapter and more importantly, does this system allow for a shallow depth of field?

The moonkp guys
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Old October 15th, 2002, 04:05 PM   #2
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Please read this thread I started recently

If you have questions reguarding DoF and how it applies to your particular set-up, post on either thread and I'll be happy to answer any questions. the following threads may be of interest also

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Old October 15th, 2002, 08:33 PM   #3
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Michael's lens set up was a way to allow for true manual focus for pull and rack focus effects. His system does not affect DOF as it has little to do with the lens and more to do with the size of the CCD. Read Jeff's threads and it will explain it all.
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Old October 18th, 2002, 05:09 AM   #4
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I should probably make a note on that page (about Michael's set-up) that it was written early in 1998, prior to the availability of the Canon 14x lens. No doubt about it, that article is way out of date now and is still online only as a matter of historical record.

After re-reading the article, it's important to note that it makes no claims at all about depth-of-field. It's strictly about precise focus control.

The Watchdog is going to be updated and taken out of frames shortly, and I suppose that would be a good time to go back through and add dates to the articles... plus, it looks like I'll need to add a disclaimer to that particular article, about how it's been outdated since the introduction of the first Canon manual lens back in the Fall of 1998. Hope this helps,

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Chris Hurd is offline   Reply With Quote
Old October 19th, 2002, 04:31 AM   #5
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Whatever lens you use, whatever shooting distance you choose, for a given CCD size and F-number, DOF will not change if the (filmed) size of the objects remains fixed. Other optical means have been posted in the past.
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