DSLR Lens: Extras Features That Improve Your Photos part:1
Here’s the list of features that manufacturers pack into modern digital SLR lenses:
- Silent autofocus
- Full-time manual focus
- Non-rotating front element
- Crop reduction
- Superior optics
- Image stabilization
- Internal zoom
Silent Autofocus
If you enjoy taking discreet photos or don’t want your subjects to be aware that you’ve got a camera aimed at them, this type of focus will give you away every time.
Common names for this include Ultra-Sonic Motor (USM) and Hyper-Sonic Focus (HSF). All that these really means is the lens is dead quiet when it is focusing.
It’s is also an essential tool for wildlife photographers
Full-Time Manual Focus
On most lenses, if you want to switch from autofocus to manual focus you have to flick a switch on the lens.
Since autofocus systems don’t always get it right, having the ability to focus manually all the time is helpful.
Some special set of lenses that feature full-time manual focus. This means that even if the autofocus for the lens is engaged, you can still focus manually to make fine-tuned adjustments.
Non-Rotating Front Element
On some lenses, the front of the lens rotates when you focus.
If you put a piece of tape at the top of your lens and then focused on your subject, the tape would not longer be at the top.
So the front spins around. It is a problem if you are a landscape photographer trying to use a polarizing filter on your lens.
A polarizing filter changes the light entering the lens depending upon how it is oriented. Let’s say that you set your polarizing filter just how you want it.
Now you focus, and the polarizer spins around. It is no longer capturing the same image as before, so now you have to re-set it.You’ll have to re-set it every time you focus.If you know for sure that you’re going to take landscape photos with your digital SLR, you’re probably going to want to use a polarizing filter at some point.
Make sure that the lens you get has a non-rotating front element.
Continue part 2…
For more info visit http://rebeldigitalslr.com read reveiw,guide and tips for Canon and Nikon DSLR cemera.
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I am using SONY a, DSLR-A700Z, provides unparalleled optical resolution, clarity and description over a versatile zoom range from wide angle to medium telephoto. I must say that digital SLR lenses works magnificently having the best features as you mention here.
Here?s the list of features that manufacturers pack into modern digital SLR lenses: Silent auto focus Full-time manual focus Non-rotating front element Crop reduction Superior optics Image stabilization Internal zoom Silent Autofocus If you enjoy taking discreet photos or don?t want your subjects to be aware that you?ve got a camera aimed at them, this type of focus will give you away every time. Common names for this include Ultra-Sonic Motor (USM) and Hyper-Sonic Focus (HSF).