brennanphotoguy
Well-known
Love my Maxwell screen. Made the shooting experience of my Rollei much better.
TLR focus screen samples
- Thread starter Dan Daniel
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Ron (Netherlands)
Well-known
I doubt it comes from Japan...the seller is based in China. Also it does look exactly like the Jinfinance screen which go for about USD 25.
Further before buying one should ask for the exact dimensions since the 2.8f and 3.5f use bigger screens than the other Rolleiflexes.
rgraphex
Established
I did mention to the seller that older rollei's measure 56mm x 64mm seller offered to cut down. Looking at the center of screen I did not see any resemblance to the jinfinance. He's statement of manufactured in Japan is probably a lie. So has any one tried this one?
Dan Daniel
Well-known
Did you mention this specific screen to Rick Oleson? He told me that the Seagull people had new molds made for screens. But that he had some problems with them- the focal length was off or something? I don't want to mis-represent the issues, so best to ask him directly.
I would send Rick a link to the screen on Ebay and ask if he knows anything. I see that there are at least three other sellers with similar screens, two of which have different names but the exact same page format as the link you gave. One of the screens shown has a straight split, not 45 degrees, and has three dots on one edge, probably for meter lights? I don't know where Rollei gets its screens these days, either TLR or SLR, or if that dot pattern might be for one of its cameras? The recent Rollei screens I have seen are excellent.
I would send Rick a link to the screen on Ebay and ask if he knows anything. I see that there are at least three other sellers with similar screens, two of which have different names but the exact same page format as the link you gave. One of the screens shown has a straight split, not 45 degrees, and has three dots on one edge, probably for meter lights? I don't know where Rollei gets its screens these days, either TLR or SLR, or if that dot pattern might be for one of its cameras? The recent Rollei screens I have seen are excellent.
rgraphex
Established
Dan the mamyia b split sounds interesting to me. Since the screen is from a 6x7 would the split rangefinder be off? And yours is $90 installed? Is the thickness the same or do you shim it?
rgraphex
Established
You know what works well for me is a plain Keiv 88 screen its bright and easy to focus at least for me. Too bad they only measure 55m x 55mm There not expensive maybe these would work in other tlr's for other people.
Dan Daniel
Well-known
If you like plain screens, the Mamiya 'A' plain screen is nice. Actually a touch brighter than the B split screen. Do you think you could handle a screen swap yourself? The shipping is the killer.
What model camera do you have? There are ways to shim to compensate for the screen thickness differences.
I will center the split, microprism, or plain area when cutting one down. As will Rick Oleson. I will assume that the Chinese seller(s) understand this but I would be certain to confirm.
The last time I talked to Bil Maxwell he was getting $255 a screen; Fleenor's $274 might be the present price from Bill, also.
What model camera do you have? There are ways to shim to compensate for the screen thickness differences.
I will center the split, microprism, or plain area when cutting one down. As will Rick Oleson. I will assume that the Chinese seller(s) understand this but I would be certain to confirm.
The last time I talked to Bil Maxwell he was getting $255 a screen; Fleenor's $274 might be the present price from Bill, also.
rgraphex
Established
I'm still window shopping all the options. What material are you using to shim with? I have a micrometer. I have removed and cleaned screens in the past. I have 2.8b 2.8d models. Fleenor cleaned both and the 2.8d had the lens re-coated so there's some money wrapped in them. I may have to wait awhile. I'm looking for the best bang for the buck.
Evanjoe610
Established
Good Morning Dan,
I don't log in as often, but did see your message.
Based on my conversation with the widow of BrightScreen's Jim Lakey, she has enough screens to last awhile.
These Mamiya RB67 screens were made to specifications for a Brighter alternate Replacement Screen for the Mamiya RB67. For those that knew the late Jim Lakey, he along with Bill Maxwell and Beattie Screens were the pioneers of Third Party Bright Screens.
These screens were to be the start of his custom screen business, but he passed away before realizing his dream.
I went back & forth between Rick and her, as she was in mourning. Asa gesture to a good man,I tried to help her along with bills by testing these screens.
With Rick helping out by cutting & etching my choice of grid patterns, I discovered that these screens was as close as possible to the Maxwell screens, but being harder in its screens for any scratching due to softness. Bill's screens are the Brightest BUT also the Softest.
Consider it a compromise of the two screens. I'm glad to had help out both involved parties to keep the cost as low as possible with enough margin for both to recoup initial investment.
I'm plan to send 2 Rolleiflex 2.8 models overseas (D & E respectively) for a complete overhaul of the camera. Re-polishing & Re-coating of one camera and a New Bellows for the other.
I see where it will lead me to! Now if you had a service available for the members here, I might re-consider!
I don't log in as often, but did see your message.
Based on my conversation with the widow of BrightScreen's Jim Lakey, she has enough screens to last awhile.
These Mamiya RB67 screens were made to specifications for a Brighter alternate Replacement Screen for the Mamiya RB67. For those that knew the late Jim Lakey, he along with Bill Maxwell and Beattie Screens were the pioneers of Third Party Bright Screens.
These screens were to be the start of his custom screen business, but he passed away before realizing his dream.
I went back & forth between Rick and her, as she was in mourning. Asa gesture to a good man,I tried to help her along with bills by testing these screens.
With Rick helping out by cutting & etching my choice of grid patterns, I discovered that these screens was as close as possible to the Maxwell screens, but being harder in its screens for any scratching due to softness. Bill's screens are the Brightest BUT also the Softest.
Consider it a compromise of the two screens. I'm glad to had help out both involved parties to keep the cost as low as possible with enough margin for both to recoup initial investment.
I'm plan to send 2 Rolleiflex 2.8 models overseas (D & E respectively) for a complete overhaul of the camera. Re-polishing & Re-coating of one camera and a New Bellows for the other.
I see where it will lead me to! Now if you had a service available for the members here, I might re-consider!
rgraphex
Established
Can I ask what material is used to build up the thickness of the screen to match the ground glass? I don't want to attempt to readjust the viewing lens since I'm not sure how to Collimate the lens? I'm thinking maybe sticky back printing press mylar might work.
Dan Daniel
Well-known
Evan, thanks for the information.
rgraphex, the shimming needed is usually very small. In the range of .004-.015 inches. The adhesive layer on most materials is .002" or more in and of itself before you even deal with the material. In conversation with Bill Maxwell, he recommended Scotchtape.
You need to measure the thickness of the existing screen and the new screen. Usually the new screen will be thicker so you will be shimming the focus hood along its outer flanges to raise it up. If the new screen is thinner you will need to shim the focus hood inner flange where the screen sits in order to push it forward (closer to the viewing lens).
I would suggest taking a measurement of the existing screen and the new screen. Note the difference. Now start laying up layers of your shosen shim material on a clean hard plate. Measure the plate without any shim material, then keep measuring as you add shim material. The difference between plain plate and plate plus shim is obviously the number you want.
This is the best way I know of to measure material with adhesive on it.
Rollei's tolerance for lens to film plane alignment is .05mm, or .002" basically. This should give you an idea of the range you need to hit in such adjustments. It's not nanometer level tolerances.
rgraphex, the shimming needed is usually very small. In the range of .004-.015 inches. The adhesive layer on most materials is .002" or more in and of itself before you even deal with the material. In conversation with Bill Maxwell, he recommended Scotchtape.
You need to measure the thickness of the existing screen and the new screen. Usually the new screen will be thicker so you will be shimming the focus hood along its outer flanges to raise it up. If the new screen is thinner you will need to shim the focus hood inner flange where the screen sits in order to push it forward (closer to the viewing lens).
I would suggest taking a measurement of the existing screen and the new screen. Note the difference. Now start laying up layers of your shosen shim material on a clean hard plate. Measure the plate without any shim material, then keep measuring as you add shim material. The difference between plain plate and plate plus shim is obviously the number you want.
This is the best way I know of to measure material with adhesive on it.
Rollei's tolerance for lens to film plane alignment is .05mm, or .002" basically. This should give you an idea of the range you need to hit in such adjustments. It's not nanometer level tolerances.
rgraphex
Established
Thanks. I would like to learn how to adjust the focus. But I would settle for shimming right now. Harry Fleenor set the focus for this camera so I dont want to screw it up. I have some more questions.
I have an older Rick Oleson screen with 2 thin strips of tape. I measure this one at .055 inch with the tape
My new screen measures .056 in
Original ground glass measure's .050 in but this camera also has the extra Fresnel screen on top of the ground glass. I don't think this would effect the focus since it is on top of the ground glass. Correct me if I'm wrong?
I have an older Rick Oleson screen with 2 thin strips of tape. I measure this one at .055 inch with the tape
My new screen measures .056 in
Original ground glass measure's .050 in but this camera also has the extra Fresnel screen on top of the ground glass. I don't think this would effect the focus since it is on top of the ground glass. Correct me if I'm wrong?
rgraphex
Established
I have washers (shims) from old yashicamat hood that measure .005 inch I think this would make a good shim I just have to file down an edge so the hood could set flush. that would put me in the +- .002 tolerance.
Evanjoe610
Established
Do you have the old Dynamo Labelmaker with the roll of self adhesive tape? That is the correct thickness for the shim. At one point Bill Maxwell supplied that for the non-removable focusing screen & WLF model.
rgraphex
Established
I did have some dynamo labelmaker around here. But I settled Offset press packing sheets. These sheets can withstand pressure and are perfectly flat I choose a piece measured to .006 . This would be a good choice for someone if you can find it in single sheets.
rgraphex
Established
I went with the JIEYING screen it is much better the JinFinance or older Oleson screen. Although I have no idea how it would compare to a Maxwell since I never had one. The screen is fine not coarse like the JinFinance bright easy to focus.
I see some items are made for professional large format equipment by this company. I'll by another.
I see some items are made for professional large format equipment by this company. I'll by another.
Attachments
rgraphex
Established
First photo is the new screen the second is the original ground glass with Fresnel screen.
baachitraka
Established
May I have like to JIEYING shop?
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