>>
>> From: eric <[EMAIL PROTECTED]>
>> Date: 2007/04/25 Wed AM 04:41:53 GMT
>> To: Pentax-Discuss Mail List <[email protected]>
>> Subject: newbie question on aperatures
>>
>> Been looking at some wide angle lenses for my DL, and been noticing that
>> while any truly wide angle lense is awfully expensive (yeah, I know,
>> photography is an expensive hobby), the ones with big aperatures are
>> noticeably cheaper than those with small aperatures, numerically
>> speaking (i.e a 1:2.8 is more than one with 1:3.5).
>
> Suprisingly, the Zenitar 16mm/f2.8 is one of the cheapest lenses
> available and is also very good. You just need to be aware that
> individual samples can vary in quality, so you need to buy one that you
> can try first or go to a decent dealer. On 35mm, it's a fisheye but
> this is reduced noticably when used on a DSLR. It's a manual focus,
> non-A lens, so you need to set the custom function allowing use of the
> aperture ring, use M mode and press the +/- button before each shot.
>
You beat me to it... I was going to recommend this lens as well.
Not very fishy (I use it as a regular lens when I need something
faster/wider/sharper than the kit zoom).
>>
>> I know the aperature controls how much light enters the lens (along with
>> shutter speed), and a smaller aperature number means more light can
>> enter. Other than making it easier to get an in-focus picture while
>> hand holding the camera, what other reason would I want to get a smaller
>> number aperature? Considering 90%+ of my photography is done of
>> non-moving subjects, and using a tripod, can I compensate with a slower
>> shutter speed, or longer exposures?
>>
So long as your subject isn't moving, faster lenses (i.e. smaller
aperture numbers) aren't necessary if you can compensate in other ways
like you mentioned (slower shutter speeds, higher ISO, etc). As someone
mentioned, faster lenses are typically the "higher-end" models and are
often better quality... although not necessarily. The two big reasons why
one might get a slower lens are cost and weight... slower lenses can be
physically smaller and thus lighter.
Most arguments favor faster lenses... more opportunities.
-Cory
--
*************************************************************************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
*************************************************************************
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