how about a DOF tutorial??

Re: how about a DOF tutorial??

[quote author=Barry_Green link=board=news;num=1083366247;start=0#1 date=04/30/04 at 16:23:37]  35mm cameras usually use a lens in the range of 25-250mm, the DVX is only 4.5-45mm,
[/quote]

Barry,

I think 4.5mm in DVX isn't in the 35mm scale right ? I was reading about Century 0.6 wide lens that is around 22mm (35mm scale) in DVX, so I suppose 4.5 is around 38mm and 45 is around 360mm ??? Not sure...

Thanks,
Ulisses
 
Re: how about a DOF tutorial??

4.5mm is equivalent to about 32.5mm on a 35mm still camera, or about 18.9mm on a 35mm movie camera.

Using the Century 0.6 adapter gets you to about 2.7mm on the DVX, which equates to about 20mm on a 35mm still camera, and 11.5mm on a 35mm movie camera.
 
Re: how about a DOF tutorial??

So 45mm in DVX is about 280mm in 35mm still camera ?

Thanks Barry, merry xmas,
Ulisses
 
Re: how about a DOF tutorial??

I am interested in that SOFTSCREEN Barry mentioned on page 1. When I was out in LA on some shoots, in my downtime I went over to Hollywood Blvd. to watch a taping of the Jimmy Kimmel show and for the first part of the show they had this screen behind him. Is that screen worth $547? I saw the examples so I know it works but $547 for a 4' X 3' screen?
 
Re: how about a DOF tutorial??

That was a product I invented, and sold the product line to http://indietoolbox.com. I have no connection to them, they set all pricing and do all marketing and keep all revenues. As for whether $547 is an appropriate price... I guess the value of the product is up to the consumer to determine, just like $17,000 for the MovieTube... I can't imagine why someone would pay $17,000 for that, but I guess they've done their homework and established that they think that's a reasonable price for what they're offering, etc.
 
Re: how about a DOF tutorial??

i'm confused on the topic icons... how do you decide what a "sticky" topic is? apparently this thread is a "sticky" one........?
 
Re: how about a DOF tutorial??

look at the bottom of this page:

http://www.dvxuser.com/cgi-bin/DVX2/YaBB.pl?board=nws

there is a legend there expainling the icons- "sticky" means it stays in place and does not move down thw list but stays at the top of the section no matter how old it is or when the last post was..

"locked" means you are not allowed post a reply in that thread.
 
Re: how about a DOF tutorial??

yeah, i see that but.... who decides if a topic is sticky? is it when there is a debate going on or what? i'm just curious i guess.
 
Re: how about a DOF tutorial??

whoa, sorry... i didn't read your whole post, whoops.
 
Re: how about a DOF tutorial??

i get it now... i was thinking that a "sticky" topic was like a controversial one. heheh. oookay nevermind, void my last 4 posts.
 
Re: how about a DOF tutorial??

a moderator would decide whther to make a topic sticky or not.. generally topics are made sticky when they have important or really cool information that people feel is worth keeping at the top of the list  so it is easy to find that information  and not let it get lost in the myriad of old threads.

a topic is generally locked when no response is desired or needed to the post , or the post has gotten out of control and needs to be shut down. again, a moderator would make that decision. .. or someties its your friendly neighborhood spiderman.. one or the other.


you can click "remove" on the top right of your posts if you want to delete them ;)
 
Re: how about a DOF tutorial??

No, not exactly. What the diopters let you do is focus closer, so you can zoom in past the camera's minimum focus distance and get framing that's more akin to what you'd get from being further back and zooming all the way in, but accomplish it in a smaller room. You would again want to get as close as you can, while zooming in as much as possible. I found reasonable results by getting about 2' away and zooming in to about Z60, IIRC. But, that was with a DVX100 -- with the 100A you can focus closer so it may be less of a help. It may be a trick more appropriate for the original DVX100.
 
Re: how about a DOF tutorial??

so with a 100a, if you were constantly shooting in tight quarters, would the century 1.6x be a good choice?

Is there one definitive choice for "best way of achieving DOF physically" barring the 'get close, zoom in' method?
I like the P+S Technik adapter, but I really dislike how soft the images look. I want DOF and definition on what I have in focus :D
 
Re: how about a DOF tutorial??

You can't. That's a limitation of these cameras.

You can try zooming all the way out and getting really close, which will give you shallow DOF but it'll also exaggerate the perspective of the shot.

Or you can try using a close-up diopter lens, which will let you zoom in some while still getting close... but basically if you want shallow DOF in tight quarters, you'll need a bigger CCD so you can use more telephoto lenses and still have a wide field of view. And you can't get that on a DVX/FX1/XL2 or any 1/3" camera.
 
Re: how about a DOF tutorial??

How?

Shutter speed, by itself, has no effect whatsoever on depth of field.

Selecting a shorter shutter speed may mean that you need to open up the iris to get proper exposure, and opening up the iris will affect DOF. But changing shutter speed, in and of itself, has no effect on DOF whatsoever.
 
Re: how about a DOF tutorial??

Ok. So i've read all this but I have a question. Maybe I've missed the answer somewhere in the postings or linked pages... but I dont understand how changing your aperture will affect DoF. How does light affect things?
 
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