what should i prioritize more a lens with IS or USM??
because im thinking of buying either a
Canon Lens EF-S 55-250mm f/4-5.6 IS
or
Canon Lens EF 75-300mm f/4-5.6 III USM
Canon Lens EF-S 55-250mm f/4-5.6 IS
or
Canon Lens EF 75-300mm f/4-5.6 III USM
or probably a
Sigma 70-300mm F/4-5.6 APO DG
@fhotoace
i know what the term means i just want to know what to prioritize? whats more important having a IS or a USM? some lens dosent have both
My guess is you don't have a clue what those terms mean or how those focal lengths will fit in your Canon system.
IS is the image stabilization scheme used by Canon in specific lenses Nikon calls their version VR
USM is the ultrasonic motor used to focus certain Canon lenses super fast .. all Nikon AF-S lenses have a similar feature.
The 55-250 mm lens is the natural and least expensive lens to buy to compliment your 18-55 mm lens. The older 75-300 mm lens has a slightly longer "reach"
In some ways the choice is dictated by the body you are using (which you've neglected to mention)
The EFs lens will only fit on Rebel class digital EOS cameras & up to the 7D, they won't fit on the 5D or 1D series, or bodies older than the 10D.
Although I generally push for folk to buy the EF lens, as this keeps their future options open (for the reason explained above: EF lenses fit any EOS cameas, EFs lenses are more restricted) the particular lens you mention performs pretty poorly on digital SLRs.
Film absorbed most of the light where as digital sensors reflect more light, on some lenses this can cause pretty horrible ghosting, all of canons 75-300 lenses suffer from this. The resolution drops off pretty rapidly beyond 200mm and the lens is prone to fringing as well. As such I would not pay good money for a Canon 75-300 for use on a digital body.
Canon redesigned the IS version of the lens to become the excellent 70-300 IS USM, bit it is a chunk more money. It is an EF lens and so will fit on any EOS body, although the IS will not work with some earlier cameras such as the EOS 600 film camera.
For me the choice would be between the 55-250 IS or the 70-300 IS, both have great image quality for the money, despite the lack of a USM motor the 55-250 is a pretty fast focuser, so the decision is down to the body you are using, and how much you want to spend.
Please don't buy the 75-300. USM or not.
Canon has two types of USM (Ultrasonic Motor). Ring and Micro motor. You'll find Ring USM implemented on older and/or budget lenses. Micro motor USM is better than Ring USM. It's faster to focus, quieter and allows FTM (Fulltime Manual Focusing).
Both of the lenses you mention are budget lenses. The older EF 75-300mm is not good, so please don't consider it. Even the IS version is crap. What would you expect from a telephoto lens that only costs around US$160 to buy?
From one review..."The Canon EF 75-300mm f/4-5.6 III USM Lens is soft wide open at all focal lengths. Sharpness decreases as it zooms from 75mm to 300mm."
[URL Truncated]
The EF 55-250mm f/4-5.6 IS is also a budget lens (low end build quality, plastic mount). It also has micro motor USM, so it's fairly slow to focus, but it's accurate. It's also not the sharpest lens there is. But, out of the two lenses, it's slightly better. Just don't expect to be able to use it for action or sports or low light. [URL Truncated]
With telephoto lenses, you get what you pay for. So, if your actual priority is to have sharp and better image quality, you'll have to spend more...
e.g. EF 70-300mm f/4-5.6 IS USM (US $520). Only has Ring USM. Has IS in it's favour.
or EF 70-200mm f/4L USM (US $600). It's definitely the better of the two, with pro build and image quality. [URL Truncated]
Canon Lens EF-S 55-250mm f/4-5.6 IS
Answer by Elin Sing on 07 Jan 2010 07:27:19
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