I am an experienced 35mm user, and have switched to digital (Nikon D70s). Please can someone explain to me the change in focal lengths - ie. what are the digital equivalents of the classic 28mm 35mm 50mm 70mm 85mm 135mm and 210mm lenses for 35mm cameras - I know it is to do with the size of the sensor ?
2006-12-18 21:09:45 · 6 answers · asked by misbehave4me 4 in Consumer Electronics ➔ Cameras
d70 has a 1.5x factor... 50mm looks like a 75mm but has the depth of field of a 50mm still.... so your getting a bigger depth of field for what the focal length looks like
thats why point and shoots with there mall sensors are good for macro...huge depth of field even with a small aperture
2006-12-19 00:20:32 · answer #1 · answered by GUNN3R17 4 · 0⤊ 0⤋
well, i'm an olympus user, 30 years of 35mm & 21/4, now i use an E500...
the focal length seems to have doubled. they say my 17-45 is really 34mm to 90mm and my 45-150 is actually a 90-300...
and you can use your old 35mm lenses, but you lose the auto settings, and have to stop the lens down yourself...adapters availiable on eBay.
the Cmos sensor controls how much data is squished into the file. the best analogy is... HP5 or Fp4... one gives you grain, the other doesnt.... larger filesizes mean you can adjust the parameters withoput sacrificing quality. i use 2350x3250 8 megs. displayed on a projector, or a 40 odd inch plasma TV they look incredible. even printed, they look great..but im only printing at A4. and to be honest its like printing off a full plate negative. the acutance is phenomenal.
one thing i have noticed is that 17mm (wide) has no obvious visual distortion like on 35mm, with a similar focal length, also, the DOF doesnt work properly! at F1.8 youd expect the background to be out of focus, as DOF is only around a couple of inches... it doesnt seem to work like that anymore, to throw the background out you need a longer lens, or use the macro settings, (macro seems to extend to around 6 feet) i use it with great effect for portraits... and you can also use an off camera flash, i use a metz ct45.. just plug it in... i can adjust the power output on both the Olympus and the Metz, so ive got 3 flash heads if i want.
and the Cmos sensor is what gives the photo its clarity and accompanying filesize... 50 megs RAW.. smaller sensor, less data, more grain... (actually its image degredation)
good luck.
i teach creative digital photography. (alongside 35mm 6x6 & 6x4.5)
2006-12-18 21:26:01 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I have a canon 350d - due to the size of the sensor or something the focal length of the lense in infact 1.6X the stated value. To have the same feel as a 35mm camera you would have to get a camera with a 35mm sensor
2006-12-18 21:34:35 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Digital camers vary a bit in focal length. However, most of them also have a zoom lens so the focal length will be somewhere between 28 and 85 in most cases.
The sensor size and sensitivity will change the f rating.
2006-12-18 21:21:55 · answer #4 · answered by Robert W 5 · 0⤊ 3⤋
Just take the focal length and multiply by 1.5. The aperture stays the same.
2006-12-18 22:03:58 · answer #5 · answered by Brian Ramsey 6 · 0⤊ 0⤋
The most likely reason is that the CCD sensor is not the same size/form factor as the (now old-fashioned) 35mm film frame.
2016-03-13 08:27:46 · answer #6 · answered by ? 3 · 0⤊ 0⤋
Multiply everything by 1.6
Example; 85mm * 1.6 = 136mm
2006-12-18 22:59:38 · answer #7 · answered by thesuper 3 · 0⤊ 0⤋