What Lens for Beginner?
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What do you mean by constant? Example, 70-300mm/f2.8. this is constant? 70-300mm/f2.8-4.5 then not constant right? yeah already deciding to get a kit lens first, will also rent or borrow lens to test, as buying lens is not a joking matter.
f/1.8 and lower. the price gets higher! slower than primes? what do you mean? prime are the fastest lens?
Hmmm constant for example EF 24-70 f2.8 mean at 24mm the maximum apperture is f2.8 and at 70mm the maximum apperture is still f2.8. For a non-constant lens 55-200 f4.0-5.6 means at 55 the maximum apperture is f4.0 and the maximum at 200mm is f5.6. However constant f stop lens can be quite expensive. As a beginner and a student on budget go for a kit lens and upgrade as you go along. I had the 350D den the 400D and now the 40D. I also started off with the kit lens.
Prime lens are lens that cannot zoom. A 50mm lens is fix at 50mm. Usually prime lens are "brighter" (small f number). Prime lens are generally sharper than zoom lens however there are exceptions in the market ;p
xunjas
Senior Member
f/2.8 is indeed slower than primes.. no error on that. i am refering to f/2.8 of zoom lenses.
xunjas
Senior Member
yup.. bigger aperture more expensive..
Thanks for the info! I already knew all this, just that i'm not sure constant is what. ;p Saw your pm, and replied too!
xunjas
Senior Member
for 70-300mm f/2.8-4.5, means the aperture is f/2.8 @ 70mm and the aperture value gets bigger progressively as the focal length increases. @ 300mm, the aperture is f/4.5.
Seriously consider the 50mm F1.8 first. The 50mm 1.8 will take pictures that a P&S camera can never do and justifies to your parents the need for a DSLR. After that just ask more money from them to get better lens.
first? then i wont have a range to use with. but still i will get that lens, but not so soon.
The 350D is not a lens. It's a camera body.
Anyways, when we say lenses are fast, it's not referring to focusing speed. It refers to the maximum aperture of the lenses.
A f/2.8 lens is fast because it allows you to stop fast motion using a faster shutter speed than an f/5.6 lens, because at f/5.6, you will need to slow your shutter speed down to capture the same scene at the same exposure.
That's some useful information, was having the wrong idea that fast lens are lens then can shoot faster. Yes, faster. but is due to the aperture right?
xunjas
Senior Member
bigger aperture allows more light to pass and faster shutter speed can be used while maintain same exposure. =)
solasido
Senior Member
just to add in some info.. hope that it will be useful to you (were my questions when i was new lasttime):
perhaps, u got confused by thinking that a faster lense is the one with faster "auto focus" instead of "shooting with higher shutter speed with the same lighting condition without causing under-exposure" (this one can be helped by lower f-stop ie. bigger aperture). Wide open refers to the lowest f-stop (bigest aperture of the lense).
"L" grade lense normally has faster auto-focus, better glass material, and better physical built, but higher price.
USM refers to ultrasonic motor, the benefit is that it is not as noisy as non-USM (and faster, too, faster in term of auto-focusing).
IS refers to image stabilizer, which prevents image blurring due to hand-shake (it uses gyro sensor to detect the shake and tries to compensate it), but it does not prevent blurring because of moving objects. When you press the shutter button (unless you press it slowly) you can feel a shake on the camera, and this can potentially blur the image (this one sample case).
Wide lense refer to the wider field-of-view area (hence a shorter focal point, the shorter the wider).
perhaps, u got confused by thinking that a faster lense is the one with faster "auto focus" instead of "shooting with higher shutter speed with the same lighting condition without causing under-exposure" (this one can be helped by lower f-stop ie. bigger aperture). Wide open refers to the lowest f-stop (bigest aperture of the lense).
"L" grade lense normally has faster auto-focus, better glass material, and better physical built, but higher price.
USM refers to ultrasonic motor, the benefit is that it is not as noisy as non-USM (and faster, too, faster in term of auto-focusing).
IS refers to image stabilizer, which prevents image blurring due to hand-shake (it uses gyro sensor to detect the shake and tries to compensate it), but it does not prevent blurring because of moving objects. When you press the shutter button (unless you press it slowly) you can feel a shake on the camera, and this can potentially blur the image (this one sample case).
Wide lense refer to the wider field-of-view area (hence a shorter focal point, the shorter the wider).
Just one correction. Focal point refers to the point of focus. Focal length refers to the field of view a lens offers.
In this case, the correct term should be focal length, not focal point.
ConnorMcLeod
New Member
kit lens
Bigger Aperture - bigger hole - more light.
Therefore,lens with bigger aperture(as identified by the low f value) will function better during low light performance.Thats why most F/2.8 lens are expensive.
xunjas
Senior Member
kit lens would be below 100 for a 2nd hand copy..
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