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Old Jun 8, 2006, 8:52 AM   #11
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They are really what it says on them, 18-55 and 50-200. BUT since the CCD sensor is smaller than a traditional negative, when enlarged to a copy they give you the effect of a lens that is 1,5 times longer than if the same lens is used on a traditional film camera. So it gives you pictures AS IF they would have been 27-82.5 and 75-300 on a film camera.

Mostphotographers use this "old" measure because they are familiar with it. Compare with horse powers, it made sense when most people could refer to the strenght of a horse and wanted to know how strong the car engine was.

Kjell
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Old Jun 8, 2006, 8:57 AM   #12
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Thank you.

So if I buy a 200mm prime lens, I will have the same "reach" as the 50-200 kit lens?



This means I need to buy a 300mm lens to get the greater reach
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Old Jun 8, 2006, 9:06 AM   #13
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Yes, on the long end. But probably with a higher picture quality, if you don't buy something crappy. "All else equal" (price level, coatings, general quality) primes normally give better results than zooms.And if you buy a 300 mm lens you can boast in front of friends who haven't gone digital yet. They would have to buy a 450 mm lens to get what you have with your 300.

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Old Jun 8, 2006, 9:13 AM   #14
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Thanks kjell
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Old Jun 8, 2006, 11:08 AM   #15
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Lookie here, the first paragraph gives the lens equivalent in the 35mm format

http://www.pentaxcanada.ca/digital/d...55_F35-F56.php

and

http://www.pentaxcanada.ca/digital/d...200_F4-F56.php


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Old Jun 8, 2006, 12:55 PM   #16
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"Digital" lenses for Pentax simply means that they only cover an APS-C sized sensor so they will severely vignette on a film camera. Usually it also includes an anti-reflective coating on the rear element to prevent ghosting. Focal lengths are actual, not effective, so an 18-55mm DA lens is indeed the equivalent to a 27-82.5mm on a film camera.

Ira
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Old Jun 9, 2006, 7:14 AM   #17
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Don't knock your old screw mount lenses either, there is a vast and impressive list of old M42 screw mount lenses out there on eBay that will fit your new Pentax with a simple M42 to K mount adapter.

I have a late fifties 300mm f4 m42 screw mount lens that shoots beautiful shots and sharper than my new 28-70F2.8 Ex lens.

Enjoy...:|
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Old Jun 9, 2006, 11:49 AM   #18
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Yep - bought a 135mm k-mount lens - not bad, a little soft.

Also got a bayonet to screw adapter, genuine Pentax, with instructions and removal tool for £5 in a local camera shop. They have loads of lenses with a Pentax and M42 mount.

Just got to convince my other half that LBA is a genuine diease!



Dal


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