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camera lens question
landroverkeith:
minty if youve got the kit with you m8 bring it to the billing bash my dad will be there at sum point he is camera mad if its got lots of twisty bits and little numbers on the side he is bound to know, we used to take the mick about him taking more time adjusting the camera that he missed the shot lol
minty:
i wanted to find out first before i got them keith :wink:
Terranosaurus:
--- Quote from: "minty" ---](*,) ](*,) ](*,) yes thay screw in and yes for the perpus of the posting iv choosen x2 diffrent type lens but both type come in 1.45 or .22x and all i need to know is which one will give a bigger picture (wide or fish eyed) dossent matter i getting both is there more picture in 1.45 or .22x ???????????
--- End quote ---
How many times the .22 is a wide angle adaptor the 1.45 is a tele (zoom) adaptor.
Therefore the 0.22 will give a "bigger picture"
JumboBeef:
--- Quote from: "barny" ---if someting optical is written as 22x, that effectively is 22x the power of the naked eye, e.g. a pair of binoculars marked as 10x40mm is ten times the power of the naked eye with a 40mm lens. A rifle scope marked as 3-9x50 will be three times the naked eye on its lowest setting zooming through to nines time power on its highest setting, looking through a 50mm lens.
--- End quote ---
Not right old chap, I'm afraid.
Your eye sees the world roughly the same as a 50mm lens.
The size of a lens (ie: 20mm) is the focal length ~ the distance from the lens to the film plate. The shorter this distance, the wider the angle of view, hence a wide angle lens.
The 'zoom' of a lens is the max focal lenght of the lens, based on the widest angle. So, to say '20x' zoom means nothing, you need to know 20x what, such as 20 x 20mm. This means the widest is 20mm and the tighest (telephoto) is 400mm, and you can zoom from 20mm to 400mm.
30 x 40mm is tighter (more of a zoom) than a 40 X 20mm, for example, even though the first is 'only' a 30x and the second a 40x.
I guessing the two lenses talked about, 1.45 and .22, are both old lenses and are in inches.
Mudlark:
--- Quote from: "JumboBeef" ---
--- Quote from: "barny" ---if someting optical is written as 22x, that effectively is 22x the power of the naked eye, e.g. a pair of binoculars marked as 10x40mm is ten times the power of the naked eye with a 40mm lens. A rifle scope marked as 3-9x50 will be three times the naked eye on its lowest setting zooming through to nines time power on its highest setting, looking through a 50mm lens.
--- End quote ---
Your eye sees the world roughly the same as a 50mm lens.
--- End quote ---
No not really it all depends on the size of the film or plate
You are right in as much as 35mm film cameras but if you use 120 film 65 x 65 mm then the standard lens is 80mm.
If you go the other way to digital cameras then you are looking around 38mm for a standard lens.
Now minty's explained that they are adapters it makes sense.
Adapters do not have a focal length as a lens does they adapt the focal length of the lens that they are put on by a set multiple - hence the x on the end of the size
So using a 50mm lens, putting a .22x adapter on make the lens a 11mm lens ((fish eye) wide angle), putting a 1.45x adapter on makes the lens a 72.5mm (short telephoto)
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