Why need adapter power at DVinfo.net

Cengiz Ozgok · February 5th, 2006, 10:30 AM

It's not clear to me why a adapter need power
Outher question is can you also be able to use your zoom option with the adapter.

Ben Winter · February 5th, 2006, 10:47 AM

*cracks knuckles* oh boy, here we go...

Cengiz, a 35mm adapter works by positioning a translucent focusing screen in front of the camera, between the 35mm manual lens and the camcorder. The purpose of the translucent focusing screen is to allow the image to be projected onto it. The camcorder then records what it sees is being projected onto this screen. But because the screen isn't totally free of imperfections, and will have what we call "grain" (tiny pits and/or bumps in the surface of the material) we need to vibrate/oscillate or rotate this focusing screen at a high enough speed so motion blur effectively eliminates this "grain". Movement like this usually requires a motor, and motors usually require power.

When you focus your camera on the focusing screen, you have to leave your camcorder's zoom and focus controls alone, because now the image is being controlled by the manual lens you're using on the front of the adapter. If you want zoom capabilities, you must purchase a manual zoom lens.

I hope you understand adapters more clearly--this sort of thing is why I vote for a sticky to be posted outlining general details like this.

It's ok though--I was just as confused as you are when I first found this site, believe me. :)

Mike Glover · February 5th, 2006, 02:18 PM

I vote for sticky as well.

Andrew Todd · February 5th, 2006, 02:59 PM

it can be quite confusing (and exciting) when you are just finding out about these. lots to learn

Justine Haupt · February 5th, 2006, 03:21 PM

Sticky! I don't remember how long it took me to learn just that much when I first found out about these.

Mike Teutsch · February 5th, 2006, 03:36 PM

Quote:

Originally Posted by Justin Haupt

Sticky! I don't remember how long it took me to learn just that much when I first found out about these.

I second that! I don't know how many posts I read, and how much research I did just to find out how they worked?!?!?!? I looked everywhere.

I want to build one when I get the time.

Mike

Andrew Todd · February 5th, 2006, 03:53 PM

mike.. i built a few of my own.. ended up just settling for buying a 2nd hand letus35.. it works amazing.. seems to be alot easier seeing how these people selling theirs have already down the legwork for you.. but if its something you want to try out on your own definately go for it .. its pretty fun.

Mike Teutsch · February 5th, 2006, 04:14 PM

Quote:

Originally Posted by Andrew Todd

mike.. i built a few of my own.. ended up just settling for buying a 2nd hand letus35.. it works amazing.. seems to be alot easier seeing how these people selling theirs have already down the legwork for you.. but if its something you want to try out on your own definately go for it .. its pretty fun.

Hi Andrew,

Ya, I know how that is. I would be doing it mostly for the fun of it. I used to own an industrial machine shop and just love designing and building things. I picked up a lathe recently to make bushings and stuff when I built my dolly, and I am getting ready to get a vertical mill. Just manual and not CNC, but I can’t stand not having my machines!

Have fun!

Mike

Michael OKeefe · February 5th, 2006, 04:28 PM

Quote:

Originally Posted by Ben Winter

I hope you understand adapters more clearly--this sort of thing is why I vote for a sticky to be posted outlining general details like this.

It's ok though--I was just as confused as you are when I first found this site, believe me. :)

Ben, i second that. When i first found this section of the site, i had no idea what they were talking about. After finding the Mini35, a lot of it was cleared up, but it was confusing before that.

Wayne Kinney · February 5th, 2006, 04:37 PM

http://en.wikipedia.org/wiki/Depth_of_field_adapter

Link above could perhaps be a sticky, as it details the 35mm adapter concept fairly well.

R.P. Cuenco · February 5th, 2006, 06:59 PM

very simple and concise article on 35mm adapters, i vote for sticky as well

February 5th, 2006, 10:30 AM	#1
Cengiz Ozgok Regular Crew Join Date: Feb 2006 Location: Delfzijl-Netherlands Posts: 33	Why need adapter power It's not clear to me why a adapter need power Outher question is can you also be able to use your zoom option with the adapter.

February 5th, 2006, 10:47 AM	#2
Ben Winter Trustee Join Date: Jun 2005 Location: Hollywood, CA Posts: 1,675 Images: 1	cracks knuckles oh boy, here we go... Cengiz, a 35mm adapter works by positioning a translucent focusing screen in front of the camera, between the 35mm manual lens and the camcorder. The purpose of the translucent focusing screen is to allow the image to be projected onto it. The camcorder then records what it sees is being projected onto this screen. But because the screen isn't totally free of imperfections, and will have what we call "grain" (tiny pits and/or bumps in the surface of the material) we need to vibrate/oscillate or rotate this focusing screen at a high enough speed so motion blur effectively eliminates this "grain". Movement like this usually requires a motor, and motors usually require power. When you focus your camera on the focusing screen, you have to leave your camcorder's zoom and focus controls alone, because now the image is being controlled by the manual lens you're using on the front of the adapter. If you want zoom capabilities, you must purchase a manual zoom lens. I hope you understand adapters more clearly--this sort of thing is why I vote for a sticky to be posted outlining general details like this. It's ok though--I was just as confused as you are when I first found this site, believe me. :) __________________ BenWinter.com

February 5th, 2006, 02:59 PM	#4
Andrew Todd Major Player Join Date: Oct 2005 Location: Saint John, CANADA Posts: 633	it can be quite confusing (and exciting) when you are just finding out about these. lots to learn __________________ video : xl2 / letus35xl / bogen 503 photo- canon 1dmkII - bronica etrsi

February 5th, 2006, 03:21 PM	#5
Justine Haupt Major Player Join Date: Oct 2005 Location: Long Island, NY Posts: 208	Sticky! I don't remember how long it took me to learn just that much when I first found out about these. __________________ ~Justine "We are the music makers, and we are the dreamers of dreams" -Arthur O'Shaunessey (as quoted by Willy Wonka)

February 5th, 2006, 03:53 PM	#7
Andrew Todd Major Player Join Date: Oct 2005 Location: Saint John, CANADA Posts: 633	mike.. i built a few of my own.. ended up just settling for buying a 2nd hand letus35.. it works amazing.. seems to be alot easier seeing how these people selling theirs have already down the legwork for you.. but if its something you want to try out on your own definately go for it .. its pretty fun. __________________ video : xl2 / letus35xl / bogen 503 photo- canon 1dmkII - bronica etrsi

February 5th, 2006, 02:18 PM	#3
Mike Glover New Boot Join Date: Nov 2005 Posts: 8	I vote for sticky as well.

February 5th, 2006, 04:37 PM	#10
Wayne Kinney Major Player Join Date: Jun 2005 Location: Brighton, East Sussex, UK Posts: 938	http://en.wikipedia.org/wiki/Depth_of_field_adapter Link above could perhaps be a sticky, as it details the 35mm adapter concept fairly well. __________________ Thanks, Wayne.

February 5th, 2006, 06:59 PM	#11
R.P. Cuenco Regular Crew Join Date: Nov 2005 Location: Concord, CA Posts: 118	very simple and concise article on 35mm adapters, i vote for sticky as well __________________ Letus35 Flip on HC1 FCP5 w/ Intel Mac Mini and Powerbook Ti G4