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Dan Diaconu M

Member Since 17 Jul 2008
Offline Last Active Mar 14 2011 02:42 AM
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Posts I've Made

In Topic: M. David Mullen, DP of "Jennifer's Body"

22 September 2009 - 12:25 PM

With you (and Karl) at work, the picture looking good is no surprise David.
What lake was that in the scene?
Was the whole picture in or around Vancouver (or just parts).
Cheers,
Dan

In Topic: What is a "normal"

21 June 2009 - 03:19 PM

Why does this matter so much to you? Do you really choose a focal length by what's exactly "normal" or do you choose a focal length by what view and perspective it gives you and how it affects the subject?


No, it does not matter all that much, just a little bit. I choose a focal by "need" (space available, action, meaning of the dialog, etc) but I would like to have some sort of reference point.

All that matters to me is that I know a certain range of focal lengths have a relatively unforced or natural perspective, but that can be a range of 20mm or so. I'm not going to quibble over 5mm...


Agree.

I mean, technically the SLR full aperture may be the same as 8-perf VistaVision, 37.72 x 24.92, not 36 x 24, so the diagonal would be 45.21mm.


I agree again.

You'll note that the Wiki entry uses terms like "generally" or "about" so they know this is not an exact science either. I mean, if you showed someone a photo shot on an SLR at 43mm, 45mm, and 50mm and told them to pick the "normal" one, most people would say they all looked about the same.


I agree most people will hardly notice the difference, but if pointed out what to look for, they will order them from wide to tight.

The question I asked was related to smaller formats where the "diagonal" doesn't produce the "normal.
In my previous post I mentioned two different focal lengths for the same format (13.8X20.7mm).
The "normal" by frame diagonal turns to be a 25mm. That's a long way to go to the 70 that matches the eye view.
I don't fuss over 5mm (more or less) here David. Generally and about doest cut it either. We have almost three times the difference.
I suppose you have an SLR (film or digital) handy (a digital would actually be better).
What would you call "normal" between a 25 and a 70?
Thanks for contribution.

In Topic: pulling focus and markings

12 June 2009 - 11:39 PM

quote: The only focus reference that is worth anything is one that doesn't move. end quote.
more sound advice here:
http://www.cinematog...es/FOCUSING.HTM

In Topic: Split diopter or Tilt Shift?

03 June 2009 - 03:50 PM

Here is what I would try:
find a lens (acting as a diopter) and glue it centered on a UV filter on the camera lens. It should be roughly the diameter of the image you want to see (about 1/4???? of the filter??)

I know it takes some experimenting with different focal lengths but it provide you with just the shoot you need. You could also use it in combination with another lens (mimicking the scope)
You know better how much effort is worth the shoot.
Good luck anyway.
Dan Diaconu

In Topic: f stop and depth of field

30 April 2009 - 03:42 AM

Although answered already, for the "why" part is because any smaller section of the lens is closer to the design than the whole lens (hence the high price of fast lenses/primes and the less expensive digital zooms starting at 4/5.6).
But I have another question: from a practical point; how does one measure the confusion? Some people like to add a personal touch to their images http://fc01.devianta...by_pixel_ah.jpg
and those are far from circles. Daytime images (without lights) still show a fair amount of bokeh (confusion) in their natural shape (not necessarily circles)
Is there an apparatus (caliper or something) to measure the confusion?(charts aside) How do you do it?
The confusion grows with the projected screen size and distance (not only lens, aperture and originating format).
Help, I am diffused.

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New Pro Video - New and Used Equipment

Paralinx LLC

Willys Widgets

FJS International, LLC

Ritter Battery

Wooden Camera

Broadcast Solutions Inc

CineTape

Rig Wheels Passport

Glidecam

Media Blackout - Custom Cables and AKS

Gamma Ray Digital Inc

Aerial Filmworks

CineLab

Metropolis Post

The Slider

Abel Cine

Visual Products

rebotnix Technologies

Tai Audio

Technodolly