medium format ground glass??

[Andrew Todd]

http://www.intenscreen.com/products_...mat_mamiya.htm
#83340

are these medium format gg too heavy or large for the letus. i would like something bigger in mine .. and i found one cheap. thanks

[Carl Jakobsson]

I don't know if they fit Letus, but I got one Mamiya Beattie relatively cheap on eBay. The pciture was fantastic, but all hairy and grainy. So it's not a good solution for a static adapter. I've wanted to build a Letus-type adapter myself for the Beattie, so I'm a bit interested too. I haven't touched a D screen so I don't know anything about weight differences. I think the Beattie is so light that it feels like it doesn't weigh anything. The problem I can see using one in the Letus, would be its size.

[Francois Poitras]

Andrew, you should write to Reflexite to get the dimensions.

Many medium format Beattie are two part, the screen itself and the Fresnel. Some of them come with a metal frame, which appears to be the case of the 83340.

The Beattie Intenscreen I have is the one for the Contax RTS II (35mm format). It is pretty light. When I ordered it, I was sent a medium format Intenscreen for a Bronica model. It was two part, but with no frame. I think it would have been too heavy for my vibrating adapter (made after the Letus design).

[Andrew Todd]

56mm by 41mm are its dimensions

[Winston Vargas]

I am using a beattie screen on my unit (static) and if the lens is used between 5.6 and 2.8 wide open I have no problems with grain. The beattie is perfect for the adapters, but you have to pay 180.00 for one, and if your image is hairy it simply means that the groundglass is scratched or dirty, mine is perfect. I bought it new. the vibrators have to be a bit larger then the standard beeper or cell phone vibrator, because of the weight of the groundglass. I am using Mamiya 645 lenses on my unit. I will be posting some shots of the adapter, you can see them on the dvxuser site.

Originally Posted by Carl Jakobsson

I don't know if they fit Letus, but I got one Mamiya Beattie relatively cheap on eBay. The pciture was fantastic, but all hairy and grainy. So it's not a good solution for a static adapter. I've wanted to build a Letus-type adapter myself for the Beattie, so I'm a bit interested too. I haven't touched a D screen so I don't know anything about weight differences. I think the Beattie is so light that it feels like it doesn't weigh anything. The problem I can see using one in the Letus, would be its size.

[Winston Vargas]

I am using a medium format groundglass with the frenel lens and it's too heavy for the small vibrator so the solution is 2 vibrators. I am also using medium format lenses (Mamiya) I was going to use Hasselblad lenses but the focus ring is too tight on them. I hope to go into production of these units shorthly. Will post pictures in the very near future.

Originally Posted by Francois Poitras

Andrew, you should write to Reflexite to get the dimensions.

Many medium format Beattie are two part, the screen itself and the Fresnel. Some of them come with a metal frame, which appears to be the case of the 83340.

The Beattie Intenscreen I have is the one for the Contax RTS II (35mm format). It is pretty light. When I ordered it, I was sent a medium format Intenscreen for a Bronica model. It was two part, but with no frame. I think it would have been too heavy for my vibrating adapter (made after the Letus design).

[Winston Vargas]

The bigger groundglass is not going to do anything for you if you use 35mm lenses. The 35mm lenses are made to cover a 24x36mm area, in order to get the quality of the larger groundglass you have to use medium format lenses that are made to cover a larger area. I am using lenses made to cover 1 5/8x 2 1/4 inches. The bigger the grounglass the better the picture.

Originally Posted by Andrew Todd

http://www.intenscreen.com/products_...mat_mamiya.htm
#83340

are these medium format gg too heavy or large for the letus. i would like something bigger in mine .. and i found one cheap. thanks

[Francois Poitras]

Interesting, Winston. Are you using disk motors, like the Letus? I would have thought using a heavier GG (and two motors) would send a lot of vibration to the unit and camera.