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04-13-2009, 06:36 AM   #31
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parallax - i agree 17mm is 17mm. however when you are using a full frame lens on an APS-C size sensor you get the 1.5x zoom factor. This makes a FF 17mm a 23.5mm on a pentax DSLR.

Great for telephoto (300mm=450mm) not so great for super-wide, hence why i purchased the Di II lens for wide application.

Did no one else know about this?

~T

04-13-2009, 06:57 AM   #32
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QuoteOriginally posted by shiestmiester Quote
parallax - i agree 17mm is 17mm. however when you are using a full frame lens on an APS-C size sensor you get the 1.5x zoom factor. This makes a FF 17mm a 23.5mm on a pentax DSLR.

Great for telephoto (300mm=450mm) not so great for super-wide, hence why i purchased the Di II lens for wide application.

Did no one else know about this?

~T
Yes, and when you use a 17mm APS-C specific lens on an APS-C sensor you get EXACTLY the same effect. 1.5X factor! (Vs FF) 17mm FF and 17mm APS-C capture exactly the same image on an APS-C sensor. This is easy enough to demonstrate. Put your camera on a tripod, put your SMC M 50mm 1.7 on and take a picture. Now put your 17-50 on, set it at 50mm and take another shot.

EDIT: Don't you find it a bit odd, that with the wealth of knowledge and expertise on this board that "no one else knows about" it?

Last edited by Parallax; 04-13-2009 at 07:04 AM.
04-13-2009, 07:55 AM   #33
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There are many great zooms for Pentax on the market. Some will fill gaps where there are no primes. Once you determine the range(s) you shoot at, pick up the primes that compliment your style and 'usual' focal range. The Pentax 12-24, 17-70, and 50-135 covers the majority and are great lenses. Shooting long, 300mm and up, will have some cost considerations.
04-13-2009, 06:49 PM   #34
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I've never seen an image yet that made me say "I must have the lens that took that shot" - except the fisheye. The fact it was a zoom was a bonus :-)

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