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#1
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Fresnal for Deardorff
Are there any Fresnal screens that will brighten the groundglass and
work well with a restored Deardorff both for 8x10 and the 4x5 reducing back. |
#2
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Fresnal for Deardorff
I bought a BosScreen for mine and it worked very well. The BosScreen isn't a
true "brightening" screen but it has much the same effect because it spreads the image evenly across the screen, eliminating the "hot spots" of a plain ground glass. It's also easier to focus with than a Fresnel. If you end up being the winning bidder for this camera I'd give the screen that's on it now a try, it may work fine for you. I used three screens on my Deardorff, the original non-Deardorff that came with the camera, a Deardorff screen I found later, and the BosScreen. While the BosScreen was an improvement over the other two, it wasn't like night and day better. I'm sure a Fresnel would have brightened things more but I've always found Fresnels not so easy to fine focus. "Dave Wallis" wrote in message om... Are there any Fresnal screens that will brighten the groundglass and work well with a restored Deardorff both for 8x10 and the 4x5 reducing back. |
#3
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Fresnal for Deardorff
Dave Wallis wrote:
Are there any Fresnal screens that will brighten the groundglass and work well with a restored Deardorff both for 8x10 and the 4x5 reducing back. I have found that with long lenses, a Fresnel is not really necessary. The trouble is with the short lenses (e.g., 90mm on 4x5). There, everything is great if the lens is on-axis, but if you use any shifts or rise or fall, the illumination tends to be worse than no Fresnel at all. So I no longer use them. Ron Wisner has easily removeable Fresnel screens for his camerae. Since I imagine they are moulded vinyl plastic, you could probably get one of his and cut it to fit (if necessary). You could probably call him and ask. -- .~. Jean-David Beyer Registered Linux User 85642. /V\ Registered Machine 73926. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 7:40am up 49 days, 19:01, 2 users, load average: 2.02, 2.09, 2.08 |
#4
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Fresnal for Deardorff
"Dave Wallis" wrote in message
om... Are there any Fresnal screens that will brighten the groundglass and work well with a restored Deardorff both for 8x10 and the 4x5 reducing back. I bought a very thin, cut to size fresnel from Jeanie, J.M. Sharkey . Apparently a photographer and a single person garage business. I'm happy with mine. Being a newbie, though, I don't know how well it compares to a "real" fresnel. It brightens the GG pretty evenly, I'm guessing about two stops. She (he?) claims the thickness is 0.016", but I didn't mic it. On the two test shots I made specifically for focus shift, it was certainly within my depth of focus, although I could have chosen a more critical test subject. There was a single hair from my yellow lab stuck to the side of a velvet lined case, running almost broadside to my line of view. I just don't recall which end I focused on. Works fine enough in real life, too. Cost was $55 for 4x5, bought through eBay. I suspect direct private sales are possible. I have no relationship with the seller except as a non-disgruntled customer. If I weren't curious how a "real" factory fresnel looks, I wouldn't hesitate in the future to buy a second one. |
#5
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Fresnal for Deardorff
Jos. Burke wrote:
I have Maxwell Screens (Maxwell Precision Optics) on both my Deardorff 4x5 Special and my 8x10 V8. My initial purchase was to aid in focus via his Brilliant Fresnel and gridded focus screen on my 4x5. The screen was such an improvement over the standard orig Deardorff GG on my 4x5 (Especially with my 90 mm Fuji) that I had Bill make one for my 8x10 as well. Brightness is not the only benefit as the image is rather much finer on his screen as opposed to the orig acid etched GG. A real pleasure to use and absolutely no "I wish I Had's!" on my part!! I've been tempted to try one of his screens on my 4X5, used them on medformat cameras and they are amazing. -- Stacey |
#6
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Fresnal for Deardorff
I have Maxwell Screens (Maxwell Precision Optics) on both my Deardorff
4x5 Special and my 8x10 V8. My initial purchase was to aid in focus via his Brilliant Fresnel and gridded focus screen on my 4x5. The screen was such an improvement over the standard orig Deardorff GG on my 4x5 (Especially with my 90 mm Fuji) that I had Bill make one for my 8x10 as well. Brightness is not the only benefit as the image is rather much finer on his screen as opposed to the orig acid etched GG. A real pleasure to use and absolutely no "I wish I Had's!" on my part!! Joseph Burke "Dave Wallis" wrote in message om... Are there any Fresnal screens that will brighten the groundglass and work well with a restored Deardorff both for 8x10 and the 4x5 reducing back. |
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