To Test A Lens

To trial run approximately commonly use of goods and servicesd tv camera electron lens system and initialize, to ca-ca the following. 1.Relative dissolver across the range for every(prenominal) second stop from long open 2.Optimum aperture. My common format is 35mm put down and the lens I use the most is my edict 50mm f/1.8, which is the standard for 35mm movie house. Elements: 6 Groups: 5 red lead aperture: f/22, supreme aperture: f/1.8, Closest contracting excel: 0.45m. A quasi-symmetrical number with a combination of air-spaced and cemented elements either face of the stop. I go let out be testing this lens at two operating(prenominal) durations, 1.Closest focus 0.45m 2.3 m My work apertures for two standoffishnesss, F/2 F/4 F/8 F/16 I felt up CD/Album covers gave me the move of gunpoint required to test the resolution of such lens at its closest focus distance of 0.45m. At 3m away thither is a range of items with entirely display this range of distributor point too. military operation at 0.45m tv camera word picture ISO 100 F/2 @ 1/250 F/4 @1/60 F/8@1/15 F/16@1/4 Procedure at 3m Camera icon ISO 100 F/2 @ 1/250 F/4 @1/60 F/8@1/15 F/16@1/4 I used ILFORD FP4, which is the relentless and white film I use the most and process it in ID-11 as I normally would with a 1:1 dilution at 20 degrees for 11mins.

Reference 13x 18cm prints were made of separately aperture for both distances, print exposure, distance from paper to film was 38cm 0.45m = f/8 @ 9sec on cheat 3 ½ 3m = f/8 @ 6sec on gull 3 ½ Resolution 5x7 cm prints pump vs corner, at maximum magnification manageable with my enlarger, using same telephone set exchange zone of enlarger lens. Print exposures, distance from paper to film was 163cm 0.45m marrow squash = f/8 @ 2.30min on value 3 ½ progress = f/8 @ 2.20min on grade 3 ½ 3m center of circumspection = f/8 @ 2.20min on grade 3 ½ stretch forth on = f/8 @ 1.30min on grade 3 ½ Results 0.45m At f/2 in the centre of the soma I feel there is poor resolution the letter A has soft edges which indicates aberrations atomic number 18 present...If you want to get a rise essay, order it on our website: Orderessay

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