Need help deciding: 240mm Symmar S or 250mm Fuji W. Discussion in. My 150mm is a Symmar S and other than the smallish 210mm image circle, it's very sharp and has great saturation. Other than having that. Mark, but I'm looking at a couple of 250mm Fujis from a reputable dealer that have good glass and an accurate shutter but with ugly. . 240mm is a tele/portrait-angle of view lens on 4X5 cameras (similar to a 100mm lens on 35mm cameras). This lens is used, tested and working as it should. Cosmetically, this lens shows minor/normal signs of use. Clean glass. No fungus, haze, scratches or other major issues to note.
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These years, we all through focus on being a professional tempered glass processing industry company by technology study, production skill improvement, excellent management & engineer team work, strict quality control, and precision production machine. From past time till today, GL always insists of our business philosophy of 'Innovation Engineering, Win-Win Cooperation, Integrity and Efficiency', to provide professional skill, good quality product and the best service to our customer. That is the reason why we have highly confidence of our customer's and to be the approved supplier of top 500 enterprise in the world. Security: When the glass is external damage, Debris will become very small obtuse angle grains and difficult to cause harm to humans. Tempered glass cut to size High strength: the impact strength tempered glass of the same thickness of ordinary glass 3 to 5 times more than the ordinary glass,bending strength 3-5 times. Tempered instruments glass Thermal stability: Tempered glass has good thermal stability, can withstand the temperature is more than 3 times that of ordinary glass, can withstand 200 °C temperature changes.
![240mm glass circle design 240mm glass circle design](/uploads/1/2/5/6/125634356/885846604.png)
![240mm Glass Circle 240mm Glass Circle](/uploads/1/2/5/6/125634356/773899513.jpg)
SEMI) f ) Integrated production processes that meet ISO 9001:2000 requirements and standards l Technology parameters: a) Material: BOROFLOAT ® 33, PYREX 7740, Quartz glass, b) T hickness: 0.3mm, 0.5mm, 0.6mm, 0.7mm, 1.0mm, 1.5mm ( Tolerance ±0.02mm ) c) Round ize: Φ2 ', Φ3 ', Φ4 ', Φ5 ', Φ6 ', Φ8 ', Φ12 'ect. D) MIL: 60/40 e) Roughness (Ra) Less 1.5 nm f) TTV Less 0.01mm g) Chamfer C0.05 0.2mm h) Edge collapse Less 0.2mm i) Surface cleaning, There shall be no marks and stains, Packed in clean room, Using special boxes. L BOROFLOAT 33 ® basic performance: Technical parameters: Density (25 ℃ ) 2.2g/cm 2 Expansion coefficient (ISO 7991) 3.25 ´ 10 -6k-1 Transmittance 91% Softening point 820 ℃ Short time use less 10h 550 ℃ Long time use more 10h 450 ℃ Refractive index ( 587.6nm ) 1.47140 Knoop hardness 480 Standard Sizes Thicknesses Packing 1150 x 850 mm 0.7 - 25.4 Small wooden case or Triwall 1700 x 1300 mm 16.0 - 21.0 mm Large wooden case 2300 x 1700 mm 3.3 - 15.0 mm Large wooden case Max. Tempered Glass Circle Description of tempered glass circle Tempered glass is a type of glass with evenly distributed compressive stresses on the surface which is made by heating float glass to nearly softening point and then cooling it down rapidly by air. During the instant cooling process, the glass exterior is solidified due to rapid cooling while the interior of glass is cooled down relatively slowly. This process will improve the glass exterior compressive stress and interior tensile stress resistance which can improve the overall mechanical strength of glass by gemination and result in good thermal stability. Circle stepped lighting glass During the instant cooling process, the glass exterior is solidified due to rapid cooling while the interior of glass is cooled down relatively slowly.
This process will improve the glass exterior compressive stress and interior tensile stress resistance which can improve the overall mechanical strength of glass by gemination and result in good thermal stability. Professional team of engineers to create high-precision instrument products, and to undertake glass mirror, as the glass mirror, such as non-standard products such as custom processing. About product and suppliers:Alibaba.com offers 780 flat clear glass circles products. About 75% of these are building glass, 2% are glass, and 1% are glass processing machinery.A wide variety of flat clear glass circles options are available to you,There are 780 flat clear glass circles suppliers, mainly located in Asia. The top supplying country or region is United States, which supply 1% of flat clear glass circles respectively.Flat clear glass circles products are most popular in United States, Mexico, and South Korea.