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Lens quality....
How do you determine lens quality? Several manufacturers make basically the same lens but they prices are not all the same. I have a Canon Xsi with the 18-55 kit. I am looking at getting something in the 55-250 range and am not sure how to disquish a quality product versus a crappy one. Any suggestions / recommendations would be helpful..

Thanks..

John..

Comments (9)

Research. Google search for reviews on each of the lenses you are looking at..

'I reject your reality and substitute my own' -Adam Savagehttp://www.flickr.com/photos/mrnoronha/sets/..

Comment #1

Price is a very good - but not absolute - indicator..

If you see a 75-300 lens for $150, and a 70-200 lens for $1700 - guess which one is better .

And as USACanuck wrote - read..

Here's a great start for Canon lenses (as well as some Sigma and Tamrons): http://the-digital-picture.com/.

Cyclepa11 wrote:.

How do you determine lens quality? Several manufacturers makebasically the same lens but they prices are not all the same. Ihave a Canon Xsi with the 18-55 kit. I am looking at gettingsomething in the 55-250 range and am not sure how to disquish aquality product versus a crappy one. Any suggestions /recommendations would be helpful..

Thanks..

John.

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Comment #2

I appreciate both of your comments. Let me ask this a different way. Should I be sticking with Canon lens? If not are their any manufacturers to stay away from because the have an inferior product...

Comment #3

Yeah, I have that 75-300 and I can confirm it's not better than anything at all, including not having a lens. You could probably draft a quick charcoal sketch of your subject in less time than it takes to autofocus...

Comment #4

Cyclepa11 wrote:.

I appreciate both of your comments. Let me ask this a different way.Should I be sticking with Canon lens? If not are their anymanufacturers to stay away from because the have an inferior product..

All manufacturers make both good and bad lenses...and some stuff in-between. As Imac said, use price as a guide. A cheap lens is a cheap lens!.

As one example, Sigma makes some really good lenses...they are the ones with "EX" on them. They compare well against the best Canon and Nikon lenses of comparable specs...but they cost less. For a specific example, the older (non VR) Nikkor 80-200mm f/2.8 is comparable to the Sigma 70-200mm F/2.8. The Nikkor product is several hundred $ more expensive and has perhaps a 1% better IQ. You tend to pay a bit more for C & N lenses..

Charlie DavisNikon 5700, Sony R1, Nikon D300HomePage: http://www.1derful.infoBridge Blog: http://www.here-ugo.com/BridgeBlog/'Experience: Discovering that a claw hammer will bend nails.Epiphany: Discovering that a claw hammer is two tools...'..

Comment #5

A few rules of thumb:.

1) Look at the reviews on http://photozone.de/.

Don't dwell on the specs and charts, read about the build and handling. Look at the example photo's..

2) Count the number of aperture blades the lens has. More is better for out of focus rendering. 5 or 6 is cheap. 8 or 9 is good..

3) Build quality and weight..

4) If it's a zoom lens beware wide range of zoom between minimum and maximum. More optical compromises must take place for one lens to cover a wide range. Not to say a wide zoom isn't useful, but it's probably optimized for convenience rather than utmost image quality. YMMV depending on your output medium, size, and how critical you are of the final result..

Nobody builds a cheap lens with a high number of aperture blades or high build quality. Build quality usually translates into weight because glass is heavy, and metal is heavier than plastic...

Comment #6

Mrxdimension wrote:.

A few rules of thumb:.

1) Look at the reviews on http://photozone.de/Don't dwell on the specs and charts, read about the build andhandling. Look at the example photo's..

2) Count the number of aperture blades the lens has. More is betterfor out of focus rendering. 5 or 6 is cheap. 8 or 9 is good..

3) Build quality and weight..

Nobody builds a cheap lens with a high number of aperture blades orhigh build quality. Build quality usually translates into weightbecause glass is heavy, and metal is heavier than plastic..

As it often is, mrxdimension's opinion is dead on. Canon's EF-S 55-250mm f/4-5.6 IS seems to be a pretty good choice, right now..

Cheers, Craig..

Comment #7

Thanks Guidenet, I think .

If it's this lens I'd object to the plastic mount. I'm not comfortable with plastic where precision surfaces are concerned..

Http://www.photozone.de/...4-canon-ef-s-55-250mm-f4-56-is-test-reportreview..

Comment #8

Mrxdimension wrote:.

Thanks Guidenet, I think .

If it's this lens I'd object to the plastic mount. I'm notcomfortable with plastic where precision surfaces are concerned..

Http://www.photozone.de/...4-canon-ef-s-55-250mm-f4-56-is-test-reportreview.

I agree, but in this case, the lens is pretty inexpensive and getting good reviews. Several of my friends own it and use it on better Canon's like the 40D and seem to really like it. I'm not a big fan of plastic mounts either, but I'm not sure it would cause any problems.Cheers, Craig..

Comment #9

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