Looking for a sharp zoom *help? please?*

[Jarhead5811]

I'm a big fan of the Tamron 17-50mm f/2.8($450ish). I use mine 99.99% of the time.

[ckw]

Thanks all of you for being so willing to pipe up and help me out with this! I really appreciate it.


I probably should also have mentioned that for about 75% of the time I am shooting on a tripod. (I don't know if it makes a difference, but I figured more info the better)





Thanks Jarhead That Tamron was actually on my "maybe" list! It's good to hear it get a recommendation. My other "maybe" was a Canon 17-85 although I keep reading many mixed reviews about it.





Sean


My budget is about £250-300 for the moment (and I know I won't get much for that, but I have to try)


Chuck


Thank you also for the positive feedback on the Tamron.


With regard to the sharpness (or lack thereof) "Do you use any sharpening or USM in post processing?" I do in photoshop for the sigma, but not for the 60. I figured that the 60 would be nicer because it was a dedicated prime instead of a zoom..For example, I didn't realize that lenses could differ (being the same model but softer or not!) But I'm still learning this photography stuff (and I'm afraid that the more technical it gets the more my brain reads it as algebra and starts to zone out)


Jarhead & Chuck


"USM? Unsharp Mask, right? (I'm thinking she might not know that.)"


Yep, I have absolutely no clue about that. Are we talking something I do in photoshop, or is this something I do on the camera itself (I only got the 40D in march when my rebel went kaput & I'm still trying to make the learning transition)





Sean


Thank you for the suggestion on the 70-200mm f/4 L ...right now that's coming up at £975.00....just *cough* a tad out of my range. (for now at least).

[Sean Setters]

<a>Sean[/URL]


Thank you for the suggestion on the 70-200mm f/4 L ...right now that's coming up at &pound;975.00....just *cough* a tad out of my range. (for now at least).

You mayhavelooked at the price for the 70-200mm f/4 L IS (Image Stabilized) lens (although I'm unsure exactly where you live and what currency you're talking about). The 70-200mm f/4 non-IS, however, is quite a bit cheaper than the "IS" version. It's right at $600 USD at BHphoto.com if I remember correctly. Again, that might still be a bit out of your price range...but it's worth looking into because you might want to save up a little longer and get a superior lens that you won't feel the need to upgrade anytime soon.

[ckw]

Sean:


Ah, yes, I see I did manage to find the one with the IS. And the non IS is considerably cheaper although at this point 400&pound; (I'm in the UK) is just beyond me.





Chuck &amp; Jarhead:


CAn you tell me is there a difference between the <span id="v4-1"]<span>Tamron AF 17-50mm F/2.8 Di-II LD Aspherical Lens and the one you've suggested? (I'm sure there is but I want to be clear so I avoid buying the wrong camera)





Many thanks folks!

[Chuck Lee]

CAn you tell me is there a difference between the <span id="v4-1"]<span>Tamron AF 17-50mm F/2.8 Di-II LD Aspherical Lens and the one you've suggested?

ckw,


That's the lens. We just didn't go on and onand on and on with all the SP DII Asper etc.... stuff.


USM stands for "Unsharp Mask" and it is a sharpening technique that can easily be done from Photoshop CS# or even Elements.


In CS# it is under Filter/Sharpen you will see "Unsharp Mask" in the menu list. When you open it, there will be a preview box with a 100% zoom that has three settings "Amount, Radius, and Threshold" That is why I listed the figures as (200, .6, 0) Those would be the three values to enter. I find with my 40D that .3-.6 for the radius works really well. A threshold of 0 is fine because you are probably using ISO 100 and the image is clean. All that's left to do is dadjust the Amount. 150 - 300 are common values and you will see a big difference in the sharpness of you image.


That's why I'm saying you may want to hold off on replacing the Sigma 17-70 until you get a chance to work in a little sharpening. Is there anyway that you can post comparison images between you 60 macro and the Sigma 17-70 @60mm? Take two pictures of the same thing, both at f8. You may not need a new lens after all.


Last Note: As I said earlier, Lenses can vary in performance from copy to copy. I tested two copies of the Tamron 17-50 f2.8 DII when I purchased it and the first one was absolutely terrible. It wasn't a focus issue, it was an optic issue. The lens was terribly soft, even stopped down. The second was very sharp and I'm happy to say still being used today. So, It may be that you do have a bad copy of the 17-70 and need to send it back to Sigma to have it adjusted.


Hope these things help,


Chuck

[peety3]

USM stands for "Unsharp Mask" and it is a sharpening technique that can easily be done from Photoshop CS# or even Elements.

Well, it stands for Ultrasonic Motor or Unsharp Mask, depending on the context. It took me a while to figure out Unsharp Mask, so I really struggled to figure out how a dose of focusing was useful in post processing...

[Chuck Lee]

Good One Peety3...........[]


Never crossed my mind. Not that it's much to cross! LOL