Completely Confused Nube

2 months 1 week ago #686850 by Rosco
OK, I picked up a Vivtar 35-70mm f2.8/3.8 lens in a pawn shop for $13. The lens is in near perfect condition with caps at both ends, clear
glass and smooth zoom & focus. What I expected (seeing the word ZOOM) was that
this lens would do just that… zoom in or magnify my subject. When I press zoom on my DSLR camera, that’s what happens. With this lens however, there is
essentially no magnification, but rather the opposite. With the zoom ring all
the way back the image is approximately that of the normal eye. As I extend the
ring forward the subject elements get smaller and the width of view increases
substantially.
Is this then the application for this lens?.. to reduce the size of the elements of the composition in exchange for broader field (wider
angle)?
I appreciate your input (other than comments regarding my total lack of understanding). Thanks


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2 months 1 week ago #686851 by Shadowfixer1
The zoom on your camera will only operate a "power zoom" lens. The lens you bought is a manually zoomed lens. This is the way the majority of zoom lenses work. There are not many power zoom lenses when compared to the number of normal zoom lenses. When you say the image looks approximately like the normal world you are most likely at 70 mm. When you manually zoom out to the 35mm setting, you increase the field of view. In other words you are taking in more of the scene before you. 
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2 months 6 days ago #686947 by garyrhook
I'll try to add a few words here.

70mm is essentially what the human eye sees (which is actually 50mm -ish). 35mm is "wide angle".

The relative zoom of that lens is 2x (70 / 35 = 2).

How the lens operates is a function of the lens. Some lenses have rotating controls, but the direction of rotation is up to the manufacturer. How that lens operates was up to Vivitar. So recommend you don't have any expectations on what should happen.

Finally, as a "noob", it's worth knowing that older lenses can be fun for their character. But keep in mind that focal lengths are consistently meaningful across all cameras: 50mm is 50mm.


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2 months 2 days ago #687384 by Rosco
Thank you both for taking the time to respond.
I’ve worked with the lens a bit and find it very suitablefor hikes or drives through the country, shooting subjects like old barns and
abandoned farm machinery. At 35mm, I get nice open pastoral scenes of rolling
fields and stones walls, though I find it could use a hood in some situations. 


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