homemade optical lens adapter?

John Hudson · November 13th, 2003, 01:52 PM

I own a DVX100. Also own a non-reflex Bolex16 that also has a telephoto lens that is separate from the bolex and you attach it to the lens mount.

I wonder if there is anyway to tinker with the bolex stuff to enhance my DVX?

Agus Casse · November 14th, 2003, 02:38 AM

Ok, i just finish up my box ...

in one side i got a 50mm lens from a minolta camera... in the other side i got the homemade ground glass... (with is made from a DV case with some scotch tape... just for testing) ... now when i test it... i found that i have too much vigneting and the light only is strong in the center of the ground glass... is there a way to correct this and light up all the ground glass... ?

i thought that if i put mirrors in all the interior faces that would help to light up a little.. but duno... any sugestions ?

Brandt Wilson · November 14th, 2003, 08:05 AM

This is what the fresnel does. You can get cheap ones at office supply stores. However, you are going to be able to see the rings. There is always a tradeoff.

Agus Casse · November 17th, 2003, 01:32 AM

Ok... we made the adapter... but we have problems cause even the ground glass works fine.. you still see the round shape light that comes up strong from the lens and that screw up the quality of the image.... we are still looking for the solution.. but now.. all i can said that it is all about the ground glass... if you get a good one... from there it is all piece of cake...

Noah Posnick · November 23rd, 2003, 12:37 PM

Angus: where did you get your ground glass?
Also just a general question... how do you figure out where to place the ground glass in relationship to the dvcamera and 35mm lense?

Agus Casse · November 23rd, 2003, 09:37 PM

I made the ground glass using one of those fake cds check out this post... i am putting allt he news about the adapter here

http://www.dvinfo.net/conf/showthrea...622#post116622

Josh Brusin · November 24th, 2003, 10:56 PM

OK... I've been following this pretty closely. (or trying to) I think to avoid the vignetting perhaps you can bounce the light to avoid the majority of the lens light... in this case using a mini CD in the existing spindle and funnel the light over it and then back onto it (shifting the mounting of the spindle up and connecting the additional lens slightly above the camera lens)... ((like the mini35)) this would mean closing off the center of the spindle (container) reducing the amount of "ambient" (I guess) light that causes the vignetting thus having a more detrimental effect on the available image light hence additional stop loss...
actually I am going to sleep on this and hopefully be more coherent in the morning. Very interesting Agus.

Agus Casse · November 25th, 2003, 12:27 AM

I have no vigneting at all with my adapter...

Josh Brusin · November 25th, 2003, 10:11 AM

sorry... saw your jaguar spot and was wondering if the vignetting there was just a zoom issue.... the spot spot looked great - how'd you fix it?

Josh

Agus Casse · November 25th, 2003, 02:07 PM

That video is really the old, that is the first test... check on this link

http://www.dvinfo.net/conf/showthrea...threadid=17195

November 23rd, 2003, 12:37 PM	#20
Noah Posnick Regular Crew Join Date: Sep 2003 Location: New York, NY Posts: 64	Angus: where did you get your ground glass? Also just a general question... how do you figure out where to place the ground glass in relationship to the dvcamera and 35mm lense? __________________ Noah Posnick http://www.posnick.com

November 24th, 2003, 10:56 PM	#22
Josh Brusin Major Player Join Date: Nov 2003 Location: Chicago, IL Posts: 439	mirrors? OK... I've been following this pretty closely. (or trying to) I think to avoid the vignetting perhaps you can bounce the light to avoid the majority of the lens light... in this case using a mini CD in the existing spindle and funnel the light over it and then back onto it (shifting the mounting of the spindle up and connecting the additional lens slightly above the camera lens)... ((like the mini35)) this would mean closing off the center of the spindle (container) reducing the amount of "ambient" (I guess) light that causes the vignetting thus having a more detrimental effect on the available image light hence additional stop loss... actually I am going to sleep on this and hopefully be more coherent in the morning. Very interesting Agus.

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November 13th, 2003, 01:52 PM	#16
John Hudson Major Player Join Date: Sep 2003 Location: 32° 44' N 117° 10' W Posts: 820	I own a DVX100. Also own a non-reflex Bolex16 that also has a telephoto lens that is separate from the bolex and you attach it to the lens mount. I wonder if there is anyway to tinker with the bolex stuff to enhance my DVX?

November 14th, 2003, 02:38 AM	#17
Agus Casse Major Player Join Date: Jul 2003 Location: Guatemala Posts: 322	Ok, i just finish up my box ... in one side i got a 50mm lens from a minolta camera... in the other side i got the homemade ground glass... (with is made from a DV case with some scotch tape... just for testing) ... now when i test it... i found that i have too much vigneting and the light only is strong in the center of the ground glass... is there a way to correct this and light up all the ground glass... ? i thought that if i put mirrors in all the interior faces that would help to light up a little.. but duno... any sugestions ?

November 14th, 2003, 08:05 AM	#18
Brandt Wilson Major Player Join Date: Jan 2003 Location: Portland, OR Posts: 220	This is what the fresnel does. You can get cheap ones at office supply stores. However, you are going to be able to see the rings. There is always a tradeoff.

November 17th, 2003, 01:32 AM	#19
Agus Casse Major Player Join Date: Jul 2003 Location: Guatemala Posts: 322	Ok... we made the adapter... but we have problems cause even the ground glass works fine.. you still see the round shape light that comes up strong from the lens and that screw up the quality of the image.... we are still looking for the solution.. but now.. all i can said that it is all about the ground glass... if you get a good one... from there it is all piece of cake...

November 23rd, 2003, 09:37 PM	#21
Agus Casse Major Player Join Date: Jul 2003 Location: Guatemala Posts: 322	I made the ground glass using one of those fake cds check out this post... i am putting allt he news about the adapter here http://www.dvinfo.net/conf/showthrea...622#post116622

November 25th, 2003, 12:27 AM	#23
Agus Casse Major Player Join Date: Jul 2003 Location: Guatemala Posts: 322	I have no vigneting at all with my adapter...

November 25th, 2003, 10:11 AM	#24
Josh Brusin Major Player Join Date: Nov 2003 Location: Chicago, IL Posts: 439	sorry... saw your jaguar spot and was wondering if the vignetting there was just a zoom issue.... the spot spot looked great - how'd you fix it? Josh

November 25th, 2003, 02:07 PM	#25
Agus Casse Major Player Join Date: Jul 2003 Location: Guatemala Posts: 322	That video is really the old, that is the first test... check on this link http://www.dvinfo.net/conf/showthrea...threadid=17195