Copyright 10-2016 Ken Wheeler
1. NEVER TRUST anyone’s images claiming they represent a lens. Wisdom necessitates you ask: Did the lens produce that image, or did you use that image from the lens to produce a radically different image?
2. ONLY 3 THINGS IN LENS DESIGN HAVE IMPROVED IN THE PAST 25 YEARS: 1. Wide-angle lens resolution & distortion improvements. 2. Autofocus speed tracking motors / design. 3. In-lens image stabilization.
3. Any fool who buys a lens based merely upon its resolution is no better than an alcoholic who buys a wine based merely upon its Alcohol content percentage. ALWAYS BUY A LENS based upon the highest / best output possible. This is no different than falling in love with a beautiful person who has deadly transmittable diseases.
4. ALL lenses are to be judged upon six criterion. R.P.G. & B.C.D. Resolution, Phase, Gain & Bandwidth, Construction, (AF) Drive.
5. Microcontrast is SET IN STONE at any an all apertures pertaining to a lens design. If it has bad microcontrast, it cannot be resurrected to look good especially for ALL B&W shooters
6. GLASS IS EVIL, regardless of its quality, design, coating, or chemical additives. Any FOOL who tells you that a quality 35mm (for example) with 9,10,11+ elements produces a “good as / better image” than a quality 35mm with 4,5,6 elements, is a LIAR, FOOL and has no ability to discern good from excellent.
7. GLASS IS BOTH Insulator & Capacitor. EVERYTHING in the Universe is ELECTRICAL & MAGNETIC by nature, including LIGHT itself & GLASS. ALL LENSES are designs with unique attributes of capacitance, resistance, permeability & permittivity of low-capacitance spectrum visible light (RED), and high-capacitance spectrum visible light (BLUE/GREEN), both of which behave radically different from each other passing thru ANY and ALL glass elements of any quality or design.
8. Perceived Depth & Saturation output from a lens design is either Optical, Electrical, or Both. Luminal depth /saturation. Spatial depth /saturation. Translation/Microcontrast depth /saturation. Rendered depth /saturation. Focal/compression depth /saturation. Compositional depth /saturation. Bokeh depth /saturation.
9. TIME IS MONEY, THEREFORE NEVER buy a lens based upon what you CAN DO WITH ITS IMAGE in Lightroom or Photoshop, rather what you CANNOT do with its image in-computer.
10. ALL LENS DESIGN is itself an ART, and there are (for example) 1000+ ways to design a 50mm lens. ALL LENS DESIGN is a tradeoff in output. You can make the lens output very sharp, with no CA at all, but with that will come SACRIFICES in other qualities which cannot be ADDED in-computer, such as microcontrast, bokeh qualities, etc. ALL LENSES have a limited spectrum of PURPOSE, and learn what that purpose is and never buy a lens OUTSIDE of its design spectrum of PURPOSE.
10 LAWS & FACTS OF PHOTOGRAPHY
Copyright 10-2016 Ken Wheeler
1. Exposure is Gain (aperture) & Time (shutter).
2. ISO is not part of the “exposure triangle”, it is APPLIED GAIN, not exposure! The TRUE “exposure triangle” is GAIN, TIME, & SNR (native noise).
3. Each & Every lens on earth ever made dumps out the SAME LIGHT regardless of what is underneath it.
4. Exposure is per UNIT AREA, not TOTAL AREA (i.e. ‘sensor size’)!
5. Bigger FX sensors do NOT capture MORE LIGHT ‘exposure’ using the same lens & same exposure as a DX CAMERA does. Neither does crossing the border into the larger state of Connecticut from Rhode Island result in “more light” falling on your head.
6. Less NATIVE Noise (SNR) captured on a FX sensor is due pixel pitch / photosite size (also sensor design & microlens design),…NOT sensor size! However many newer FX sensors have DX pixel pitch / photosite sizes!
7, NOISE (SNR) is defined by TWO things (with aperture, shutter speed & lens being equal across the board)…Native gain & Signal processing (AD converters & SNR firmware).
8. A camera is NOT a sensor, it’s an image processor!
9. What is CAPTURED, or native gain, ENDS AT THE SENSOR. What is PLACED on your SD card is what is PROCESSED.
10. Native exposure & processed exposure = CAMERA EXPOSURE
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ReplyDeleteVery useful and Interesting info Ken. Thanks for sharing !
ReplyDeleteThis comment has been removed by the author.
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