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15

These are known as Chromatic Aberrations or Colour Fringing. These predominantly occur around areas with high contrast such as sharp edges in photographs or around the white water bottle and dark background in your case. A wider apeture can affect the lenses sensitivity to aberrations although certain lenses can see this "effect" vary depending on focal ...


14

There are enough variations in lenses that it's hard to make a generalization about an entire brand vs. another. A lot of folks stick to the lenses from their camera manufacturer and I think that in the past the quality tended to be better. That said, some of the third party lens manufacturers have some great lenses, and some of the lenses by Nikon and ...


9

If your interest is primarily the optics, you need to look at individual lenses, not brands as a whole. You can't depend on a Nikkor (or Canon, Pentax, Sony, etc.) necessarily being sharper than something like a Sigma, Tokina or Tamron. OTOH, unless you're pretty sure you're buying a lens to keep it forever, the third party lenses don't seem to be nearly ...


9

The Tamron is known to be optically very good and sharp wide open across the frame. I know semi pro Nikon users who use that one on a crop camera for e.g. wedding shots. The F number on your kit number is only F3.5 on the widest and if you go into Av and keep an eye on it, you see it drops very quickly to F5-5.6. The range 2.8 - 4 is a stop (double the ...


8

The author had to be speaking of the Tamron 70-200mm f/2.8 Di LD (IF). The answer is no, this lens is not superior to the Canon 70-200 f/2.8L IS USM mkII. Canon would never sell a single one if the Tamron was superior, considering the Canon runs about $1600USD more in price. Some reviews of the Tamron: the-digital-picture dpreview I think that the ...


8

That is the price because that is how much enough customers are willing to pay for it. While they are complex lenses, they are not high quality ones (the Nikon is sharper with more distortions) and both are quite dim on the long end. The price is for convenience of changing lenses less often, or not all all. After all, comfort and convenience are very ...


7

Here are some reviews, with data for the Tamron, but not the Sigma: http://www.popphoto.com/Reviews/Lenses/Lens-Test-Sigma-18-50mm-f-2.8-EX-DC-Macro http://www.popphoto.com/tamron/2010/03/lens-test-tamron-sp-17-50mm-f28-xr-di-ii-vc-af And here with data for the Sigma, but not the Tamron: ...


7

Bjørn Rørslett solved this problem by just jamming a few match-sticks into the aperture control lever of a lens link It's crude as hell, but apparently it worked well enough for a weekend. Really, anything relatively clean, which is softer then the aperture lever (e.g. plastic, wood) would be effective. I'm borrowing the picture from his site. I hope he ...


6

Comparing two very similar lenses like the Sigma 18-50mm f/2.8 EX DC Macro and the Tamron 17-50mm f2.8 SP XR Di II LD VC Lens in terms of sharpness can be difficult. Often one lens will perform better at a particular focal length and aperture, while the other will perform better at other focal length and aperture combinations. Even at the same focal length ...


6

I've not used the Sigma, but I own the Tamron 17-50 VC. It really is quite sharp, just as sharp as the than the 50mm 1.8 prime, comparing both at f2.8, in my experience Also, when you're using slower shutter speeds, the VC does help prevent motion blur from camera shake. As always, it's a lot sharper at f4 than f2.8, but all lenses are.


6

My site (shameless plug) http://lenshero.com makes it easy to find lenses, for example here are 14 lenses for the D5000 with image stabilization and focus motors for less than $600. You can then easily filter by brand/focal length etc.


6

Tamron 17-50 f/2.8 VC/Non-VC comes in mind. Both are cheap and have okay image quality. f/2.8 allows you to shoot indoor while keeping your ISO to a reasonable range. This is a good lens. The Non-VC (VC = Vibration Compensation, similar to IS) version has slightly better sharpness and contrast comparing to the VC version, but Tamrons VC is a good thing to ...


6

Cheap isn't good and good isn't cheap. Good can be reasonably priced though, for events basically you never want your lowest aperture to be above f4 if you can avoid it, otherwise you'll be looking to use flash, which if you're trying to remain stealthy and go for candids will draw the attention to you. I'd recommend looking at something like the Sigma ...


6

There are repair shops that will give you an estimate of repair cost, or even better a no obligation quote. Then it's a simple case of comparing the repair cost with the used value of the equipment (trawling ebay is a good avenue for this), giving a slight bias toward repair to make up for the risk of buying used.


6

The lens has a maximum magnification of 1:3.7, or 0.27 (augh, editing! The decimal number is created by dividing the first number by the last, and I got it super wrong) so it's really not that good a macro lens. By comparison, your current lens's maximum magnification is either 0.28 or 0.34 depending on whether it's the IS one or not, so it's actually ...


6

It is hard to make a zoom lens that is sharp and open enough the entire focal range without tunnel vision and lens distortion. So the larger the range span is the more difficult it is to keep the quality equal. That's why the fixed focal length lenses still exist. You can get amazing quality compared to your zoom lenses for a small price, at the cost of ...


5

Every lens has a different sharpness. Some zooms are better at the beginning of the range, some in the middle, some at the end. Maybe yours isn't at its best on the end. Check online reviews, there sure be someone who noted that. If not, some other things can be checked: sharpness change depending on the aperture size. How is the sharpness when closing ...


5

Wait a little bit more, gather more funds and go for native: Canon 70-200 f/4 L IS. It has new optics, that's much sharper than the old Canon 70-200 f/4 L (non-IS) and is often sharper than old Canon 70-200 f/2.8 L IS! You might also consider Canon 100-400L IS for birding. It's optic performance is very good and you get excellent reach!


5

For 'fast action photography' - I'd imagine you'd want something with the 'ultra sonic' focus - its much faster than the old motors in lenses. If you're stuck to Canon, that means 'USM' lens. For 3rd party lenses, it means 'HSM' for Sigma and 'USD' for Tamron. Unless you need that extreme 28-300mm range, I'd also consider something with a faster ...


5

With an adapter (The Nikon FT1), yes. As a native lens, no. (There are no third party lenses for the Nikon 1 system yet.) Assuming you have the newer version of that lens with a built-in focus motor, it should autofocus and everything. It's my understanding that there is an older version of the same lens that relies on the camera body to have an AF motor; ...


5

They're red LEDs under the cover. I removed the cover from my 430 EX and whilst it works better (with all lenses, on account of producing a brighter, sharper grid pattern) the light is still red. Here's what it looks like without the cover: It's worth noting that you can in theory remove and replace the cover as necessary but I snapped one off the clips ...


4

This sort of thing shouldn't be common, and may be the sign of the contacts being at the extremes of "normal" tolerances, causing the communication issues between the lens and the body. If you don't have the same problems with other lenses, and the Tamron is new; it may be worth going back to the dealer and getting them to test the lens on some other bodies ...


4

I like mine a lot for indoor-shooting of parties. Nice and bright, have to step down a bit for max sharpness, but even then it will be brighter than your current 5.6 at the long end of 50mm. At a wedding I saw it been used by the professional hired there for the people-shooting too (note 1: it was our wedding-photographer too, but we weren't the one who ...


4

If the choice is between those two lens, get whichever is sharper at the longer range - so probably the Sigma (the 70-200 2.8 also makes a great lens for concerts, portraits, astrophotography, and other types of photography) - because neither lens gets you close enough for frame filling shots without extra measures. I'm just getting into birding myself, ...


4

The lenses are a fairly straight forward an economic decision. The camera perhaps less so as various things wear out and fixing one thing MAY leave another fail soon afdter. Or not. If the glass is good and the lens is not physically beaten to death then you can get a quote for repair and see how the cost compares to a new or equivalent lens. I had a ...


4

When taking pictures babies have two annoying tendencies: They move a lot, and they run at the camera. Fast shutter speeds and the ability to change framing gives a preference for a f2.8 zoom. I don't know how fast the Tamron focuses, but if you are going to use it at f2.8, I sure hope it focuses fast. Children move a lot in unexpected directions. I really ...


4

Any of those lenses will be fairly comparable. They all have their positives and negatives... I have the Nikkor lens which I picked up as my first zoom in that range to use on film and it is what it is, it's built to a price and that shows. It's not the sharpest at 300mm but (although that also makes it light if you plan to carry it around). Because of ...


4

I'm not party to any engineering details and haven't yet used the lens so this is purely speculation, however... The Canon 100-400 (a first party competitor) was originally released in 1998, it's likely that since then manufacturing methods and designs have improved considerably allowing Tamron to produce a lens of good quality for a lower price. Obviously ...


3

This is a common facet of zoom lenses. Unlike prime lenses, where all lens elements can be utilized to maximize the image quality at a single focal length, zoom lenses have to make trade-offs between image quality, focus, and various optical aberrations. Smaller zoom ranges usually tend to have better IQ throughout the focal range, while lenses with larger ...



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