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DPChallenge Forums >> Tips, Tricks, and Q&A >> another question.........
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 02/22/2005 04:11:53 PM · #1
everybodies gonna get sick of me soon i really feel like a dummy but so far everyones been helpful to me on here still being new and all, and still not a master in photography how can i know the resolution of a lens without using the price tag as a means of figuring out? thanks
02/22/2005 04:19:49 PM · #2
No questions are stupid when you don't know the answer. If I'm understanding you right, you want to know how to judge the quality of a lens? This is one area where high quality, fast glass is typically expensive. You get what you pay for in terms of lenses. Expensive glass will allow you to shoot with less light, faster shutter speeds and your images will be sharper and have better contrast.

Now, those lenses can be attached to any body that is made for them, regardless of how many megapixels that camera has, so the actual image size and corresponding print size you are able to achieve does not really depend on the lens itself, but the image sensor in the camera.

Did that help or no?
 02/22/2005 04:22:44 PM · #3
Oh absolutley anwsered the question well atleast i learned alot from what you wrote.. but iam still in libo about what lens resolution means though maybe i am going crazy lol
02/22/2005 04:25:10 PM · #4
Are you thinking focal length? Like 50mm, 70-200mm, etc? Or maybe the F-stop range like F/2.8, F/22, that sort of thing? Let us know and someone will surely clarify it for you.
 02/22/2005 04:27:27 PM · #5
Let me show you the link so you can see what iam talking about //www.hkdotnet.com/FrancisPhotographyChannel/AF_Test/index.htm right on the top of the page there are number factors and number one i dont get. thanks i really appreciate it
02/22/2005 04:31:45 PM · #6
Do you have an example of a range and an aperture that you are looking into, i.e. 28-75mm f/2.8 or 70-200mm f/4. By first specifying a range, it would make the research alot easier.

Also, what kind of shooting are you planning on doing?

The reason I ask for a range is because there are lenses out there that perform as well as the expensive ones and cost 1/3 the price, for example:

Tamron 28-75mm f/2.8 and the Canon 24-70mm f/2.8L
Tamron - $370 Canon - $1200

The resolution on both lenses are Excellent and yes the Canon does hold a slight advantage over this Tamron model. However is this worth the extra $800?

Build wise, there is no comaprison, the Canon lens is far superior than the Tamron, but the Tamron is still built well!!

Hope this helps.
02/22/2005 04:33:22 PM · #7
That wasn't the best way to word it. What they're really talking about is the optical quality of the lens, and that is most definitely related to cost. Higher quality glass unfortunately is costly, but it does produce sharper, richer images. You will definitely see a difference between a very cheap and very expensive lens mounted on the same camera.

There ARE some great, sharp and fast lenses out there that aren't too costly, for example the ever popular 50mm F/1.8 at about $100.

Also, the longer range zooms and prime lenses like the 300mm F/2.8 or 500mm F/4 will be super-expensive compared to a smaller focal length at the same speed.

02/22/2005 04:46:05 PM · #8
Don't feel stupid..I don't know anything about "lens resolution" and I sleep well at night :-)
 02/22/2005 04:46:08 PM · #9
If I interpret your question correctly, you're asking for resources that can help you sort out the lenses that provide the highest value, that is, the best bang for the buck.
While it's true that you susally do get what you pay for, we might suspect that some lenses "outperform their price" while others underperform. This is certainly true. As far as resources, try perusing the forums at dpreview.com and fredmiranda.com. You might also check out photozone.de and/or photodo.com (though photodo has not been updated in years it is still a good resource for older lenses).
Some words of caution:
- Numerical ratings cannot possibly tell you about all of the variables that go into overall lens quality. They tend to overemphasize sharpness, and underemphasize other important variables.
- Take with a grain of salt the individual postings in the referenced forums. Stick around both forums for a while and you will get a good feel for the average opinion of a particular lens. Do some forum searches on the referenced sites for a lens you are interested in, and read posts for a few hours; you will feel much more comfortable with evaluating the quality of the responses.

Good luck!
 02/22/2005 05:21:27 PM · #10
WOW Iam amazed at all the anwsers i 've sorry for taking so long to respond iam wroking right now I work for a major camera company and consumer had problems access there camera on a mac so that was a 30 minute phone call anyway i certaintly can relate to the quality of glass if you look in my profile i have glasses on and i think the lens is like cheap glass or plastic or something but i know this much they certainly arent high quality, and sometimes at night jus from a days worth of wearing them like i need to constantly wipe them Iam actually intrested in the 50mm lens f 1.8 but i wasnt understand what the actually wording high resolution it was always my understanding since i deal with cameras all day that resolution meant image size so would a high resolution lens be wide angle? more DOF? iam going crazy i dont know
02/22/2005 05:22:38 PM · #11
Originally posted by GoldBerry:
Don't feel stupid..I don't know anything about "lens resolution" and I sleep well at night :-)


Thanks atleast i dont feel by myself. Sometimes i wonder if anyone person on this board is better than another simply because everybodies asking questions but then again there are those who anwser.......
 02/22/2005 05:24:14 PM · #12
Originally posted by kirbic:
If I interpret your question correctly, you're asking for resources that can help you sort out the lenses that provide the highest value, that is, the best bang for the buck.
While it's true that you susally do get what you pay for, we might suspect that some lenses "outperform their price" while others underperform. This is certainly true. As far as resources, try perusing the forums at dpreview.com and fredmiranda.com. You might also check out photozone.de and/or photodo.com (though photodo has not been updated in years it is still a good resource for older lenses).
Some words of caution:
- Numerical ratings cannot possibly tell you about all of the variables that go into overall lens quality. They tend to overemphasize sharpness, and underemphasize other important variables.
- Take with a grain of salt the individual postings in the referenced forums. Stick around both forums for a while and you will get a good feel for the average opinion of a particular lens. Do some forum searches on the referenced sites for a lens you are interested in, and read posts for a few hours; you will feel much more comfortable with evaluating the quality of the responses.

Good luck!


Definatley will check out those sites thanks for the tips
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