Bosscreen-more comments and experiences-

[andrea milano]

Dear Friends and contributors, as some of you know I am very much in favour of this unique focussing screen and keep on wondering why it isn't provided from camera producers as a wothy option to their , sometimes very poor, focussing screen. The only itch that anyone could find id that in extrime temperature conditions i t might the wax and paraffine layer might cristallize or bubble(several degree b elow 0 centigrades and above+ 60-70 degrees centigrades) in most cases all you have to do is protect you camera fron the sun if you are shooting in death valle y(you wouldn't go youself withot as much as a strw hat would you? Why do you lea ve the camera cooking in the sun in your Black car?). However every medal has its side and apart from this debateble point the screen is near perfect. I visit their factory every now and then and it is so nice to m eet people who take you seriously and are prepared to custom make products for y ou, the best thing is that they are prepared to think together with you like in realizing a bosscreem for my Rollei GX 2,8 Edition . I like to promote the use of this screen among large format aficionados and make it known to all those who don't. If you have ever used a screen with a Fresnel lens built in like Wista, you know that they are really badly though and are almost impossible to use with a loupe , try the Bosscreen and wouldn't want anything else. This is my third screen and I'll probably will buy more.

[Howard Slavitt]

Another great option is a fresnel screen made by Bill Maxwell of Maxwell Precision Optics. They are very easy to focus with a loupe and very brigh. A different story altogether than the manufacturer's fresnel that I had used previously. The camera shop owner who helps me customize aspects of my view camera told me he preferred the Maxwell screen to the Boss screens. The Maxwell screens really come into their own with very wide lenses and if you are going to have Bill make one for your widest lens and one for use with your other lens (which I did). Bill also will listen to you and is very patient in trying to satisfy your particular needs.

[Dave Anton]

Howard, does Bill have a website with pricing?

[andrea milano]

Thanks for your answers, I am naturally curious about this Maxwell's Otics focussing screen and would like the contributors who are familiar with it to elaborate on the way this ground glass is mad, infact the comment made about bosscreen being able to be used with a 7x loupe is crucial to explain the qualities of a good screenm any screen which is matted bya a mechanical proces is bound to be made of minute mat dots, bosscreen instead has a layer of uniform (at least for our purposes....) beewax and paraffine enclosed between two glasses (hence the problematic behaviour with extreme temperatures. If Maxwell is the product of a mechanical process or a chemical one this can radically change its performance. Plastics have been used very oftem but to my impression with very poor results. If Arca has a Fresnel towards the lens then its structure will be a part of the image formed on the ground glass , thereefore any loupe would enhance the fresnel lines making the precise focussing almost impossible. In my experience Bosscreen has no need for further fresnell, however maybe with extreme wideangle it might need it, up until 75mm I've never needed any! Getting in touch with Bosscreen can prove tricky. At present they have no Internet site, they are a small company with very few people working there, this is both their stength and their limitation. They will work for you and be flexible but orders might take some time to be fulfilled because of too big a workload. However, you can call them at +31 (0)70 3970061 or write at Stabilix B.V. BurgmeesterHofylaan 84 The Hague The Nehterlands. they sell to privates and they also sell surfave mirrors (for reflex cameras) and they will also polish or coat lenses.

[andrea milano]

My typing notoriously stinks and makes the weardest mistakes seem funny, I apologize.

[M.]

Wouldn't replacing the ground glass screen presently in my camera with a Boss Screen shift the focal plane rearward by the thickness of the front glass of the Boss Screen?

[Brian Ellis]

I suspect the reason camera manufacturers don't supply the Bosscreen as original equipment is at least partly a matter of economics. My 4x5 Bosscreens cost around $150 as I recall. I presently have an 8x10 on order and it cost around $220. With respect to focusing after installing a Bosscreen, I don't know for sure. However, I know that the Bosscreens vary from camera brand to camera brand and I've always assumed this was because they manufacture them so that no focus shift will occur as compared to the camera's original screen. In other words, you don't just order a 4x5 Bosscreen, you order a 4x5 Bosscreen for a Wisner, or a Technika, or a Canham, or whatever. Of course if you've replaced the original screen with something else, I guess they can't take that into account.

[andrea milano]

Brian, It is not exactly correct that camera manifacturers don't supply bosscreen as a standard feature of their camera because Walkers actually do. However the ground glass is positionded so that the wax layer is exactly where the mat glass would normally have been (They use a spacer stip with the same thickness of the layer to insure that, details might be obtained from the directly if you write to the address I gave previously). concerning the second glass it is very thin and smaller than the outside glass, so it is laying inside the camera and wouldn't shift the position of your ground glass. Prices: The price the importers normally charge about bosscreen is almost double of the original price a 4x5 would be around $75 at the souce and a 8"x10" around $120 (must include sending and taxes), in the U.S.A. I am aware of them being imported from Bromwell and I know that Cakume-KJP carrys them too (must check in their american catalogue, I've got it somewhere else).

[andrea milano]

It was Calumet-KJP.......1

[Mark Minard]

For ordering info on the boss screen go to bromwell.com No I am not affiliated with the company in any way - I'm shopping as well as you all are!!!