Homemade 35mm Adapter

Bob Hart · January 7th, 2004, 04:34 AM

Spencer. Thanks for taking the time and trouble of grabbing the frames and posting them. Looks like you have the corner problems solved. If you find a 58mm mount 10x with wider glass I'd be interested to know the details. Regards.

Simon Fenton · January 7th, 2004, 04:46 AM

In my search for finding UK suppliers of optical parts I came across this great company, http://www.knightoptical.co.uk

Although they don't sell holographic diffusers, they do sell Acrylic focus screens which appear to have favourable properties for this kind of project, an extract from their web page reads...

"These Plastic Screens have still greater diffusion than ground glass types, allowing an image to be back-projected on a large screen without `hot spot’

They also sell a large range of various prisms and optical mirrors, although I can't seem to find Roof PentaPrisms on their list...?

Peter Sciretta · January 7th, 2004, 07:00 AM

Spencer... where did you find your Samigon +10 adapter... I just bought a century optics +7 which still can't zoom the black edges out of the frame (even with a widescreen cropped image.)

Also why do you use a frensel lens... what does this do for you?

Spencer Houck · January 7th, 2004, 08:50 AM

The Samigon +10 was found at a local camera store called "Campus Camera" at Kent State in North Eastern, Ohio. Their phone number is (330) 678-1297 if you wish to get the same one. (I don't know how they deal with shipping of orders though) Devin, on the other hand, is trying to find if a +10 with a larger glass will reduce the distortion without having to bring his camera closer to the GG like I did. He ordered a +10 with full glass, no large black ring like mine has, on ebay a few days ago; they seem to be quite common for the 58mm thread.

People seem to be quite skeptical about the fresnel for some reason, I'm not quite sure who instated that, but I think it's a necessary step in the adapter. We've found that the distance that it is positioned away from the GG is not all that crucial, just go with what works. It helps to increase the overall brightness, or more evenness of brightness in the edges of the projection on the spinning CD, which allows you to have to zoom less in order to get passed vignetting.

And yes, it's a personal "credit card" magnifier that you can find just about anywhere, I got mine from Office Max for $1.99 or so.

Spencer Houck

Peter Sciretta · January 7th, 2004, 01:25 PM

every test i do with the fresnel steps down a notch of light....

Danny Tan · January 7th, 2004, 05:04 PM

can someone link me to a +7 or +10 macro lense on ebay? i dont know wat to search for

Isaiah Kraus · January 7th, 2004, 08:16 PM

Danny,

On Ebay, try searching for "+10 macro filter" or...
Go to B & H Photo ( bhphotovideo.com ) and search for "NL10" for B+W +10 macro lenses of different diameters.
Search with NL1, NL2, and NL4 for +1, +2, and +4 power filters.

Isaiah

Danny Tan · January 7th, 2004, 09:43 PM

hey thanks. if i get a +1 +2 +4 macro filter set, could i stack them together to make a +7? and how do i know how many mm to choose? i have a gl1

Bob Hart · January 8th, 2004, 12:45 AM

Danny. Addition to note below. I did not remember you were using a GL1 and not a PD150 so comments below may be invalid.

Danny. If you look at some of the .jpg stuff I have posted here, most was shot with stack of 58mm Hoya lenses 1x + 2x + 4x. These are fairly commonly available through camera shops as a set of three in a little wallet.

For a larger than 35mm still camera frame you should be okay with a bit of darkening on the corners. For the smaller motion picture 35mm or 35mm widescreen gate you may not be able to zoom close enough to cleanly frame it.

In my posted images there are some rough and ready captioned images of test patterns for the Hoyas and a telescope eyepiece lens set. Image file "---- testpnew0+5.JPG ----" demonstrates with a testpattern, the Hoyas stacked through the AGUS35 with rotating groundglass in hostile lighting conditions layered under the image direct into the PD150.

Agus Casse · January 8th, 2004, 01:15 AM

Bob you are getting too much vigneting, are you zooming in ? you could try to close up more the GG to the dv camera to solve this.

Bob Hart · January 8th, 2004, 05:48 AM

Agus. Yes. The issue is when I zoom in closer, the focus collapses. Same goes for moving the cam closer. It seems the 10x lens as wide a diameter we can get inside the 58mm mount is what is needed for the PD150 version.

The telescope eyepiece frames a much smaller target and ceases to vignette when the image target is about 16mm diagonal across 4:3 frame corners. It will enable focus to hold on a widescreen frame 27mm across corners if the image plane is brought closer to the camera than my current adaptor allows (about 52mm from front of camera). This also does not have wide enough lenses but will zoom through to clearance about half the way through

Stewart McDonald · January 8th, 2004, 07:17 AM

I am currently trying to find connectors that I can attach to my adapter which alow me to 'plug' in my 50mm lens, and at the other end 'plug' in my GL2. Any ideas please?

Kevin Maistros · January 8th, 2004, 07:57 AM

Hey Spencer, you and I live very close to each other I'd imagine. I would be very, very interested in getting in contact with you about some things and ideas. It's suprising and refreshing all in one to find a local, AND knowledgable/good videographer around here.

I'll probably get an email out to you too, in case you see that first.

Kevin Maistros · January 8th, 2004, 08:06 AM

Also, I havn't been able to read through all of this thread yet.. but has anyone completed an adapter for the XL-1s? Would anyone be willing to make one to sell?

Luke Andrews · January 8th, 2004, 09:39 AM

Hey everyone, I just got my +10 macro in, it should compleate my XL-1 adapter. I built it about 3 weeks ago base on a project box. I'm working on a system to attach it to the XL-1 then I'll post pics and footage.

Hey shout out to all the other Ohio guys I'm based out of Medina, let me know if a get together is planned.

Luke

January 7th, 2004, 04:46 AM	#722
Simon Fenton New Boot Join Date: Jan 2004 Location: London, UK. Posts: 20	UK users looking for 35mm Adapter parts... In my search for finding UK suppliers of optical parts I came across this great company, http://www.knightoptical.co.uk Although they don't sell holographic diffusers, they do sell Acrylic focus screens which appear to have favourable properties for this kind of project, an extract from their web page reads... "These Plastic Screens have still greater diffusion than ground glass types, allowing an image to be back-projected on a large screen without `hot spot’ They also sell a large range of various prisms and optical mirrors, although I can't seem to find Roof PentaPrisms on their list...?

January 7th, 2004, 08:50 AM	#724
Spencer Houck Regular Crew Join Date: Jun 2003 Location: Akron, Ohio Posts: 65	The Samigon +10 was found at a local camera store called "Campus Camera" at Kent State in North Eastern, Ohio. Their phone number is (330) 678-1297 if you wish to get the same one. (I don't know how they deal with shipping of orders though) Devin, on the other hand, is trying to find if a +10 with a larger glass will reduce the distortion without having to bring his camera closer to the GG like I did. He ordered a +10 with full glass, no large black ring like mine has, on ebay a few days ago; they seem to be quite common for the 58mm thread. People seem to be quite skeptical about the fresnel for some reason, I'm not quite sure who instated that, but I think it's a necessary step in the adapter. We've found that the distance that it is positioned away from the GG is not all that crucial, just go with what works. It helps to increase the overall brightness, or more evenness of brightness in the edges of the projection on the spinning CD, which allows you to have to zoom less in order to get passed vignetting. And yes, it's a personal "credit card" magnifier that you can find just about anywhere, I got mine from Office Max for $1.99 or so. Spencer Houck __________________ www.par-t-com.net > C'mon, you know you wanna click it.

January 8th, 2004, 01:15 AM	#730
Agus Casse Major Player Join Date: Jul 2003 Location: Guatemala Posts: 322	Bob you are getting too much vigneting, are you zooming in ? you could try to close up more the GG to the dv camera to solve this. __________________ Agus35 - the ultimate tool for indie DV filmakers -

January 7th, 2004, 04:34 AM	#721
Bob Hart Inner Circle Join Date: Dec 2003 Location: PERTH. W.A. AUSTRALIA. Posts: 4,477	Spencer. Thanks for taking the time and trouble of grabbing the frames and posting them. Looks like you have the corner problems solved. If you find a 58mm mount 10x with wider glass I'd be interested to know the details. Regards.

January 7th, 2004, 07:00 AM	#723
Peter Sciretta Regular Crew Join Date: Nov 2003 Posts: 72	Spencer... where did you find your Samigon +10 adapter... I just bought a century optics +7 which still can't zoom the black edges out of the frame (even with a widescreen cropped image.) Also why do you use a frensel lens... what does this do for you?

January 7th, 2004, 01:25 PM	#725
Peter Sciretta Regular Crew Join Date: Nov 2003 Posts: 72	every test i do with the fresnel steps down a notch of light....

January 7th, 2004, 05:04 PM	#726
Danny Tan Regular Crew Join Date: Dec 2003 Location: Rowland Heights, CA Posts: 62	can someone link me to a +7 or +10 macro lense on ebay? i dont know wat to search for

January 7th, 2004, 08:16 PM	#727
Isaiah Kraus New Boot Join Date: May 2003 Location: Columbus, Ohio Posts: 7	Danny, On Ebay, try searching for "+10 macro filter" or... Go to B & H Photo ( bhphotovideo.com ) and search for "NL10" for B+W +10 macro lenses of different diameters. Search with NL1, NL2, and NL4 for +1, +2, and +4 power filters. Isaiah

January 7th, 2004, 09:43 PM	#728
Danny Tan Regular Crew Join Date: Dec 2003 Location: Rowland Heights, CA Posts: 62	hey thanks. if i get a +1 +2 +4 macro filter set, could i stack them together to make a +7? and how do i know how many mm to choose? i have a gl1

January 8th, 2004, 12:45 AM	#729
Bob Hart Inner Circle Join Date: Dec 2003 Location: PERTH. W.A. AUSTRALIA. Posts: 4,477	Danny. Addition to note below. I did not remember you were using a GL1 and not a PD150 so comments below may be invalid. Danny. If you look at some of the .jpg stuff I have posted here, most was shot with stack of 58mm Hoya lenses 1x + 2x + 4x. These are fairly commonly available through camera shops as a set of three in a little wallet. For a larger than 35mm still camera frame you should be okay with a bit of darkening on the corners. For the smaller motion picture 35mm or 35mm widescreen gate you may not be able to zoom close enough to cleanly frame it. In my posted images there are some rough and ready captioned images of test patterns for the Hoyas and a telescope eyepiece lens set. Image file "---- testpnew0+5.JPG ----" demonstrates with a testpattern, the Hoyas stacked through the AGUS35 with rotating groundglass in hostile lighting conditions layered under the image direct into the PD150.

January 8th, 2004, 05:48 AM	#731
Bob Hart Inner Circle Join Date: Dec 2003 Location: PERTH. W.A. AUSTRALIA. Posts: 4,477	Agus. Yes. The issue is when I zoom in closer, the focus collapses. Same goes for moving the cam closer. It seems the 10x lens as wide a diameter we can get inside the 58mm mount is what is needed for the PD150 version. The telescope eyepiece frames a much smaller target and ceases to vignette when the image target is about 16mm diagonal across 4:3 frame corners. It will enable focus to hold on a widescreen frame 27mm across corners if the image plane is brought closer to the camera than my current adaptor allows (about 52mm from front of camera). This also does not have wide enough lenses but will zoom through to clearance about half the way through

January 8th, 2004, 07:17 AM	#732
Stewart McDonald Regular Crew Join Date: Feb 2003 Location: UK Posts: 130	I am currently trying to find connectors that I can attach to my adapter which alow me to 'plug' in my 50mm lens, and at the other end 'plug' in my GL2. Any ideas please?

January 8th, 2004, 07:57 AM	#733
Kevin Maistros Regular Crew Join Date: May 2003 Location: Cleveland, OH Posts: 129	Hey Spencer, you and I live very close to each other I'd imagine. I would be very, very interested in getting in contact with you about some things and ideas. It's suprising and refreshing all in one to find a local, AND knowledgable/good videographer around here. I'll probably get an email out to you too, in case you see that first.

January 8th, 2004, 08:06 AM	#734
Kevin Maistros Regular Crew Join Date: May 2003 Location: Cleveland, OH Posts: 129	Also, I havn't been able to read through all of this thread yet.. but has anyone completed an adapter for the XL-1s? Would anyone be willing to make one to sell?

January 8th, 2004, 09:39 AM	#735
Luke Andrews New Boot Join Date: Jun 2003 Location: Medina, OH Posts: 13	Hey everyone, I just got my +10 macro in, it should compleate my XL-1 adapter. I built it about 3 weeks ago base on a project box. I'm working on a system to attach it to the XL-1 then I'll post pics and footage. Hey shout out to all the other Ohio guys I'm based out of Medina, let me know if a get together is planned. Luke