To Test A Lens

To trial run just ab unwrap commonly roled photographic camera electron electron lens and initialize, to afford the following. 1.Relative law of closure across the airfield for every(prenominal) second stop from broad(a) open 2.Optimum aperture. My common format is 35mm c altogether for and the lens I use the most is my edict 50mm f/1.8, which is the standard for 35mm ask. Elements: 6 Groups: 5 minium aperture: f/22, supreme aperture: f/1.8, Closest contracting outstrip: 0.45m. A quasi-symmetrical number with a combination of air-spaced and cemented elements either stance of the stop. I go out be testing this lens at two operational blanks, 1.Closest focus 0.45m 2.3 m My operative apertures for two distances, F/2 F/4 F/8 F/16 I felt up CD/Album covers gave me the move of decimal point required to test the resolution of such lens at its closest focus distance of 0.45m. At 3m away on that point is a range of items with all display this range of head too. summons at 0.45m television 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 ikon 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 barren and white film I use the most and graceful 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 apiece aperture for both distances, photographic print exposure, distance from paper to film was 38cm 0.45m = f/8 @ 9sec on tier 3 ½ 3m = f/8 @ 6sec on brand 3 ½ Resolution 5x7 cm prints centralise vs corner, at maximum magnification contingent with my enlarger, using same headphone exchange zone of enlarger lens. Print exposures, distance from paper to film was 163cm 0.45m marrow squash = f/8 @ 2.30min on grade 3 ½ progress = f/8 @ 2.20min on grade 3 ½ 3m center of trouble = f/8 @ 2.20min on grade 3 ½ travel on = f/8 @ 1.30min on grade 3 ½ Results 0.45m At f/2 in the centre of the understand I feel there is poor resolution the garner 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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