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07-07-2008, 01:32 PM   #1
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Help me choose my new lens...

Choose my new lens...
I am going to upgrade to a different lens for my K100D


Right now, I have the 18-55mm kit lens and a 70-200mm. I want an "all in one" lens.

I am want to carry one travel lens. Something that is wide and can also zoom in.


Can you suggest a quality lens? I am trying to gather more info to help me make an informed decision.


Thanks
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07-07-2008, 02:44 PM   #2
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28-300. Best travel lens I can think of. Relatively light and does wide angle to super zoom.
07-07-2008, 03:14 PM   #3
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The results from the Pentax or Tamron 18-250mm have been very good. It's wider and everyone that owns it has been happy with the IQ.

Here are some sample shots from the Pentax version:

Pentax smc P-DA 18-250mm F3.5-6.3 Lens Sample Photos and Specifications
07-07-2008, 03:15 PM   #4
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the tamron or pentax 18-250 is probably your best bet because it's wider and does not give up much on the tele side. quite well received by most test websites CONSIDERING it is a super zoom.

07-07-2008, 03:39 PM   #5
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QuoteOriginally posted by NicholasN Quote
28-300. Best travel lens I can think of. Relatively light and does wide angle to super zoom.

It's not wide angle on a K100D, it's normal (42mm).
07-07-2008, 05:11 PM   #6
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QuoteOriginally posted by audiobomber Quote
It's not wide angle on a K100D, it's normal (42mm).
What does that mean?

Sorry, I am pretty new to all of this.

Also, what does IQ mean?
07-07-2008, 05:46 PM   #7
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A "normal' lens denotes a length somewhere in the neighborhood of 50mm on a full-frame camera (a film or digital SLR with a 24x36mm exposure area). On a full-frame camera, 50mm is considered to be about the same field of view as the normal human eye. Since the sensor on the Pentax DSLRs is smaller than 24x36, you need to figure in a 1.5x crop factor, which extends the lens' actual length from the focal lengths you see on the lens itself. For example:

Tamron 28-300:
28mm on the lens x 1.5 crop factor =42mm
300mm x 1.5 = 450mm

Tamron or Pentax 18-250:
18mm x 1.5 = 27mm
250mm x 1.5 = 375mm

With the crop factor, the Tamron 28-300 becomes a 42-450mm lens and the Tamron/Pentax 18-250 becomes a 27-375mm lens.

Which one you would get would depend on whether you tend to shoot more wide or more tele.

IQ stands for Image Quality and is used to determine how good a lens is in producing good pictures. A couple of factors that people use in determining IQ are sharpness of images and bokeh, which simply means how well the lens renders the blurred backgrounds of images, especially when using a shallow depth of field (larger aperture setting).

HTH,
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07-07-2008, 06:03 PM   #8
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Thanks for the info. It helps.
Also, what does it mean when someone says "fast lens"


Thanks

07-07-2008, 06:57 PM   #9
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a fast lens means that you can take pictures at a faster shutter speed
fast lenses are a direct result of letting more light in, which is represented by the lower aperture number f-stop
07-08-2008, 11:13 AM   #10
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I pulled the trigger on the Sigma 18-200mm F3.5
07-08-2008, 12:58 PM   #11
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QuoteOriginally posted by bluebronco Quote
I pulled the trigger on the Sigma 18-200mm F3.5
Congratulations, but I think you mean Sigma 18-200mm F/3.5-6.3.

Oops, fixed.

Last edited by audiobomber; 07-08-2008 at 06:37 PM.
07-08-2008, 02:26 PM   #12
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QuoteOriginally posted by bluebronco Quote
I pulled the trigger on the Sigma 18-200mm F3.5
Congrats
QuoteOriginally posted by audiobomber Quote
Congratulations, but I think you mean Sigma 18-20mm F/3.5-6.3.
Lol, I think you mean the 18-250mm
07-08-2008, 02:47 PM   #13
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QuoteOriginally posted by audiobomber Quote
Congratulations, but I think you mean Sigma 18-20mm F/3.5-6.3.
QuoteOriginally posted by Peter Zack Quote
Congrats

Lol, I think you mean the 18-250mm
Sigma 18-200mm F3.5-6.3
07-08-2008, 06:38 PM   #14
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QuoteOriginally posted by Peter Zack Quote
Congrats

Lol, I think you mean the 18-250mm

LOL! Maybe we should just shut up.
07-08-2008, 06:44 PM   #15
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QuoteOriginally posted by hwblanks Quote
On a full-frame camera, 50mm is considered to be about the same field of view as the normal human eye.
To be horribly pedantic (I'm sorry! I can't help it!) the field of view is clearly much narrower than that of the human eye it's an arc of about 40 (horizontally), which is to say: if you imagine yourself standing in the middle on a big clock face looking forward at the 12, you'd not be able to see even the 1 or the 11. If you had tunnel vision that bad, I'm pretty sure they wouldn't let you drive a car.

However, the key point is that at that focal length, perspective distortion roughly matches our mental picture of what perspective looks like the image looks natural and undistorted, with no wide-angle stretching or long-lens compression.

I return you now to your regularly scheduled discussion.
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