The distance between the outermost surface of the lens mount and the film/sensor plane is known as the flange focal distance. SLRs typically have longer distances to acommodate the mirror, which results in larger lenses. Rangefinders and mirrorless cameras which do not require a mirror box tend to have smaller lenses and more compact dimensions.
Showing posts with label Reference. Show all posts
Showing posts with label Reference. Show all posts
Monday, October 31, 2011
Saturday, October 29, 2011
Sensor Size Comparison
Confused by how sensor sizes are designated? You’re not alone.
Sensor sizes smaller than small format are expressed in a ratio that describes the diagonal measurement of the frame. For example, a 1/1.7" sensor is 1 ÷ 1.7 = .588", and a 2/3" sensor is 2 ÷ 3 = .666". This gives a rough means of comparison, but doesn’t take into consideration the aspect ratio.
Sensor sizes smaller than small format are expressed in a ratio that describes the diagonal measurement of the frame. For example, a 1/1.7" sensor is 1 ÷ 1.7 = .588", and a 2/3" sensor is 2 ÷ 3 = .666". This gives a rough means of comparison, but doesn’t take into consideration the aspect ratio.
Thursday, October 6, 2011
F-Mount Lens Formulae Comparison
The other day I decided to do a quick comparison between Nikon F-Mount lens formulae from Nikon and third party manufacturers. Here are the results…
Monday, January 3, 2011
Flange Focal Distances
| Mount | Flange focal distance |
|---|---|
| Pentax Q mount | 9.20 mm |
| C-mount (Bolex, Eclair and Bell & Howell) | 17.52 mm |
| Sony E-mount | 18.00 mm |
| Micro Four Thirds System | 20.00 mm |
| Samsung NX mount | 25.50 mm |
| RED ONE interchangeable mount | 27.30 mm |
| Leica M mount | 27.80 mm |
| M39 (Leica) Screwmount | 28.80 mm |
| Contax G | 29.00 mm |
| Olympus Four Thirds System | 38.67 mm |
| Konica AR | 40.70 mm |
| Canon FL | 42.00 mm |
| Canon FD mount | 42.00 mm |
| Start (Soviet SLR) | 42.00 mm |
| Minolta SR mount | 43.50 mm |
| Fujica X bayonet | 43.50 mm |
| Canon EF mount | 44.00 mm |
| Canon EF-S mount | 44.00 mm |
| Praktica B mount | 44.00 mm |
| Sigma's SA mount | 44.00 mm |
| Minolta/Sony A mount | 44.50 mm |
| Pentax K mount | 45.46 mm |
| M42 | 45.46 mm |
| Contax C/Y Mount | 45.50 mm |
| Olympus OM mount | 46.00 mm |
| Nikon F-mount | 46.50 mm |
| Leica R mount | 47.00 mm |
| Arri PL | 52.00 mm |
| T mount | 55.00 mm |
| OCT-19 | 61.00 mm |
| Mamiya 654 | 63.30 mm |
Sensor Sizes
| Sensor (mm) | |||||
| Type | Aspect Ratio | Dia. (mm) | Diagonal | Width | Height |
| 1/3.6" | 4:3 | 7.056 | 5.000 | 4.000 | 3.000 |
| 1/3.2" | 4:3 | 7.938 | 5.680 | 4.536 | 3.416 |
| 1/3" | 4:3 | 8.467 | 6.000 | 4.800 | 3.600 |
| 1/2.7" | 4:3 | 9.407 | 6.721 | 5.371 | 4.035 |
| 1/2.5" | 4:3 | 10.160 | 7.182 | 5.760 | 4.290 |
| 1/2.3" | 4:3 | 11.044 | 7.70 | 6.16 | 4.62 |
| 1/2" | 4:3 | 12.700 | 8.000 | 6.400 | 4.800 |
| 1/1.8" | 4:3 | 14.111 | 8.933 | 7.176 | 5.319 |
| 1/1.7" | 4:3 | 14.941 | 9.500 | 7.600 | 5.700 |
| 2/3" | 4:3 | 16.933 | 11.000 | 8.800 | 6.600 |
| 1" | 4:3 | 25.400 | 16.000 | 12.800 | 9.600 |
| 4/3" | 4:3 | 33.867 | 22.500 | 18.000 | 13.500 |
| 1.8" (*) | 3:2 | 45.720 | 28.400 | 23.700 | 15.700 |
| 35 mm film | 3:2 | n/a | 43.300 | 36.000 | 24.000 |
Tuesday, November 23, 2010
Nikkor 16-85mm f/3.5-4.5G: Six Primes in One
The AF-S DX Nikkor 16-85mm f/3.5-4.5G ED VR has six ideal focal length designations on the barrel, which are my go-to numbers. Although DSLR zoom lenses are continuously variable, I find myself going straight to these numbers first, depending on the subject matter.
Canon Powershot SD780 IS: Seven Primes in One
The Canon has seven steps as opposed to the Nikon P5100’s nine, and they’re pretty similar. Starting from the short end:
| Canon Powershot SD780 IS | 35mm equivalent | f-stop |
|---|---|---|
| 5.9mm | 33mm | f/3.2 |
| 7.2mm | 40mm | f/3.5 |
| 8.7mm | 49mm | f/4.0 |
| 10.6mm | 60mm | f/4.5 |
| 12.5mm | 70mm | f/4.5 |
| 14.8mm | 83mm | f/4.8 |
| 17.9mm | 100mm | f/5.8 |
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