How to use zoom and telephoto lenses on your digital SLR

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hi I'm Shawn Carruthers and welcome to

how do I am butterscotch calm in the

series were taking a look at digital SLR

lenses and how to use them this episode

specifically we're taking a look at the

zoom in telephoto lens now there's a few

reasons why you'd want to use a zoom

lens and the main one I think is

probably because you can't get close

enough to the subject that you're trying

to shoot for example you're at a

sporting event obviously you're not

going to climb right onto the field to

take a picture of someone on third base

for example so you'd want a lens that

will actually get you close up to the

action another reason is that you're

taking photography of wildlife so a bird

or a deer in the in the bush obviously

you're not gonna get right up in front

of them and do that because they'll run

away or the fly away and you won't have

a shot to take so you'll want to do that

from afar and it's always better to keep

a respectful distance anyways in that

situation now the main Pro to assume

lens of course is magnification when

you've got a 50 millimeter lens like

this you have a certain field of vision

zooming all the way in with 400 takes

you right into the action eight times in

fact what the 50 millimeter lens can do

the cons of this there's a few of them

and now the lens itself as you can tell

is there's a lot of glass in here to

achieve the magnification which means

it's very heavy so carrying this on your

shoulder for anything like the time can

be a real trial and if you have a few of

these in your kit it can weigh you down

quite a lot and the other thing is you

lose a lot of light in the zoom lens

like this there's a lot of a barrel of

the lens here and not as much light goes

from here as it does to the sensor

compare it to something that's this

small there's not a lot of distance here

for the light to be lost so this is 2.8

aperture this one right here starts at

4.5 and goes all the way down to 5.6

which is basically losing a lot of light

just by having the extra extra glass and

extra barrel of the lens here the other

thing is when you zoom out is you have

the potential to get really blurry shots

because you're zooming way weight into

something like this and every movement

of your hand like this essentially

magnifies the end

as you can see I'm not moving the the

camera all that much but the lens is

moving quite a great deal at the end and

that's where the image is coming in so

any Tyner motion that you have with your

hand is going to magnify when you go

through the the long lens like this now

in this case we have optical

stabilization on here to make up for


but with lenses that don't have optical

stabilization you may end up with really

blurry and shaky images when you're

zoomed all the way into an item the

other thing with something like this is

it really changes your perspective on

the shot itself so when you have a shot

taken with a 50 millimeter or wide-angle

lens you have a lot more of the the shot

in the background in there when you zoom

in from afar the background changes so

we're gonna take a look at two pictures

here the first one is taken with the 50

millimeter lens you can see the subjects

in relation to the background now when

you change to a telephoto lens in this

case you walk a long ways back and then

zoom in you'll notice that the

background actually changes in

comparison to the foreground so you have

a different sense of what you have in

addition the distance between the two

items in the foreground actually changes

as well so you have less of a distance

between them from the perspective of

your new shot so it's worth remembering

that walking back and zooming in is a

much different experience from a

photographic perspective than actually

getting right up close to it you'll end

up with a different effect altogether

anyways that's a look at zoom and

telephoto lenses don't forget to check

out the other parts in our series where

we take a look at some of the other

different types of lenses and how to use