70mm Adapter

You're way too late, pal.
I've already got a 140mm adapter and its picture is so good, you can smell it.
The DOF on this ding-dong is so shallow that really obese people automatically blur.
 
I have built one using Mamiya 645 lenses. I don't have grain problems and so far it's not vibrating. I have tested it with 45 to 300mm lenses. I am using high quality groundglass, and have no problems. Using 35mm lenses is not the only answer. The larger the groundglass the better the image, same as the larger the negative the better the print. I have photos but being new to this site I have not figured out how to post the article and the photos. I also have built a viewfinder adapter for the screen of the DVX100. Hopefully I'll get some help and I will post it. You can see the pictures at http://www.bentonjohn.com/Adapter/Winston.html

Winston
 
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I have to disagree with you, you want inexpensive lenses for the medium format line.. Go to adorama.com They have the largest selection of used lenses in New York City. You can get very innexpensive lenses for 35mm, but quality has to do with everything from the lens to the groundglass, and people that are using close up lenses have to be concerned with the quality as well, every piece of glass that is placed in front of the lens has an effect on the image.

The adapter is now available for $695.00 with a 2-3 week for delivery, you can get more info at:
www.freewebs.co/wvargas/
 
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Winston Vargas said:
I have built one using Mamiya 645 lenses. I don't have grain problems and so far it's not vibrating. I have tested it with 45 to 300mm lenses. I am using high quality groundglass, and have no problems. Using 35mm lenses is not the only answer. The larger the groundglass the better the image, same as the larger the negative the better the print. I have photos but being new to this site I have not figured out how to post the article and the photos. I also have built a viewfinder adapter for the screen of the DVX100. Hopefully I'll get some help and I will post it. You can see the pictures at http://www.bentonjohn.com/Adapter/Winston.html

Winston
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Love your support system for the adapter. Looks just as effecient and probably much less expensive then the Cavision rods.


Marlene
 
Emanuel said:
Great device! Are you selling it? If yes, what's the cost to access it?

BTW, that John Benton is the same "our" Benton as dvxuser.com member? Nice guy! :)
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Nope,
Winston's just a brilliant guyy I had the fortune to meet. When we started talking about adapters and DVXuser and I volunteered to host his pictures...
I am as eager to learn as you, and what Winston is suggesting about having a larger Image to pull from is most interesting !

cheers,
J
 
Norbert said:
You don't lose any resolution with black bars on 16:9 footage, because there is no 2,35:1 tv that will stretch the image to get rid of the bars. If you output it at 720p you will still have to squeeze the image vertically and add bars if you're going to display it on a tv from a dvd. Correct me if I'm wrong. And then there is the upsampling. I would just back up a little with the camera and add black bars. That way I don't have to throw away any important information either. They black bared LOTR as well. ;)

If you would put the anamorphic adapter on a 16:9 camera and then use a DOF adapter, don't you think you would have to zoom in pretty far on the ground glass? I had problems with my 16:9 camera and my 35-adapter. However, maybe you will solve this problem with a medium format lense instead of a 35mm lens.
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The problem is that you have to be able to focus on the groundglass using the anamorphic adapter. I don't think the adapter can focus close enough to cover the frame with the groundglass. What you are trying to do is use a wide angle adapter as a macro it doesn't make sense. You're adding so much glass to the existing camera lens that no matter what you do the image will deteriorate.
 
Take it from someone has been in the photo and video business for over 40 years, the equipment is only a tool. I wish there wasn't so much emphasis placed on equipment, Let's place more emphasis on what we do with the equipment we have. I don't see anyone talking about composition or lighting ratio, or mike placement, but a lot of discussion on this and that adapter.. Oh well.
 
That's pretty much what I meant. I'm not using anything in front of my lens. :P I was talking about my native 16:9 camera (not DVX of course).
Using an anamorphic adapter before the DOF adapter means that you would have to zoom in further on the ground glass to get rid of the vignetting, and of course if you zoom in that far you will have trouble focusing as well.

EDIT: We are not talking about lightning or composition here because this is a DIY-thread.
 
Can you tell me how you're using the term 70mm? I made an adapter that uses one and 5/8 by two and 1/4 groundglass, and medium format lenses. The image is better than with a 35mm adapter because of the area that the camera lens has to film which is about twice as much as a 35mm frame. The adpater is not much larger than one made for 35mm lenses. Take a look at the adapter at... www.bentonjohn.com/Adapter/Winston.html

MORE INFO AND PHOTOS AVAILABE AT : www.freewebs.com/wvargas/
ADAPTER IS NOW AVAILABLE WITH A 2-3 WEEK FOR DELIVERY... $695.00

EMAIL : wvprod@yahoo.com
 
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The support is made by Bogen and modified on my kitchen table. It's the bogen 3420 dissected.

My 70mm adapter is now available with a 2-3 week for delivery for $695.00 check out further info at
www.freewebs.cm/wvargas/
 
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I am not selling it yet. I am trying to see how it can be produced at a reasonable price. The most expensive piece is the groundglass but it's also the most important.

The adapter is now available for $695.00 with 2-3 weeks for delivery, for further info check out www.freewebs.com/wvargas/
 
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nice

nice

yeah, i'm building something like that, but its gotten pretty involved.

i want to be able to augment the focus by pulling the lens farther from the GG, so i can use it for macro photography as well. thats an aspect of homemade lens set ups that people dont seem to be taking advantage of. Also, I'd like to be able to use interchangeable lenses.
 
I would build an adapter that will be able to focus to infinity, and then add some sort of removable ring that will make the distans between lens and GG larger for macro photo.
 
Norbert said:
I would build an adapter that will be able to focus to infinity, and then add some sort of removable ring that will make the distans between lens and GG larger for macro photo.
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Are macro rings not available for large format lenses? They are super cheap for 35mm stuff, and would eliminate the need to mess with the adapter.
 
Congrtaulations, you are the first one to comment on the viewfinder. I took the optics off a pro Panasonic camera viwfinder and built this housing ( removable of course) around the screen. I cannot work with a screen, specially outdoors and handheld. I originally designed the viewfinder about 5 years ago and been using it on my Gl1, then when I got the DVX I simply rebuilt it to size.. It's great. The screen has a magnet attached, very small and it works 100%. The viewfinder as I call it is supported by an aluminum bracket, so there is no stress at all on the screen. I shoot a lot of street stuff and a screen is nothing but a nuisance, I was a photojournalist in stills and 35 years ago started shooting video the same way and a screen is nothing but a nuisance, on a tripod is fine, but hand held is a no no for me.
 
Winston Vargas said:
Congrtaulations, you are the first one to comment on the viewfinder. I took the optics off a pro Panasonic camera viwfinder and built this housing ( removable of course) around the screen. I cannot work with a screen, specially outdoors and handheld. I originally designed the viewfinder about 5 years ago and been using it on my Gl1, then when I got the DVX I simply rebuilt it to size.. It's great. The screen has a magnet attached, very small and it works 100%. The viewfinder as I call it is supported by an aluminum bracket, so there is no stress at all on the screen. I shoot a lot of street stuff and a screen is nothing but a nuisance, I was a photojournalist in stills and 35 years ago started shooting video the same way and a screen is nothing but a nuisance, on a tripod is fine, but hand held is a no no for me.
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Thanks for the info. Could you share how you went about making that with the rest of us? Or are you going to have it available for purchase? You've got me interested...
 
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