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06-04-2009, 10:22 AM   #1
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SMC Pentax-FA 80-320mm lens

My understanding is that this lense (which was purchased with my wife's non-digital SLR) is usable on the K10D. What is the effective distance it can be used to take a photo of a large (like mountain) object? I know there are many variables but I am wondering if it would be worth investing in a fixed length lens for taking distance shots.


Last edited by Green_Manelishi; 06-04-2009 at 10:31 AM.
06-04-2009, 10:42 AM   #2
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QuoteOriginally posted by Green_Manelishi Quote
My understanding is that this lense (which was purchased with my wife's non-digital SLR) is usable on the K10D. What is the effective distance it can be used to take a photo of a large (like mountain) object? I know there are many variables but I am wondering if it would be worth investing in a fixed length lens for taking distance shots.
On digital, the 80-320mm has an effective reach of 120-480mm, which is quite nice. Not sure if this is exactly what you were asking, but it's kind of difficult to say how far away you can be from something and get a decent shot, provided a given focal length.
06-04-2009, 10:51 AM   #3
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QuoteOriginally posted by deadwolfbones Quote
On digital, the 80-320mm has an effective reach of 120-480mm, which is quite nice. Not sure if this is exactly what you were asking, but it's kind of difficult to say how far away you can be from something and get a decent shot, provided a given focal length.
Let's say, for comparison, that you took the same photo with a 15-55 lense? How much "closer" (i.e. half the distance? quarter then distance? 10 times larger?) would the object appear to be at "55" versus "320"? I hope that made sense?
06-04-2009, 11:09 AM   #4
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I'll leave that one to someone with more knowledge of optics.

06-04-2009, 11:16 AM   #5
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Angle of view - Wikipedia, the free encyclopedia

And here you can see a visual comparison between 18mm and 270mm:
http://www.dpreview.com/lensreviews/tamron_18-270_3p5-6p3_vc_n15/
You can also see 50mm here:
http://www.dpreview.com/lensreviews/sigma_50_1p4_c16/

Last edited by Enc0der; 06-04-2009 at 11:21 AM.
06-04-2009, 11:24 AM   #6
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Interesting and very helpful.
06-04-2009, 12:03 PM   #7
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I've got a SMC Pentax-FA 80-320mm lens and my complete and honest opinion of this lens is that it ropey, very ropey. It's not bad from 80mm to about 200mm but it gets hideously soft at 320mm and simply blurred at the edges and corners.

I've just given mine away to my sister as it was frankly useless at 320mm, I now use my Pentax-M 80-200mm which outclasses the FA 80-320mm by a long margin.

I will have a look for my test comparison shots. Maybe I had a bad copy.
06-05-2009, 08:47 AM   #8
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QuoteOriginally posted by Big G Quote
I've got a SMC Pentax-FA 80-320mm lens and my complete and honest opinion of this lens is that it ropey, very ropey. It's not bad from 80mm to about 200mm but it gets hideously soft at 320mm and simply blurred at the edges and corners.

I've just given mine away to my sister as it was frankly useless at 320mm, I now use my Pentax-M 80-200mm which outclasses the FA 80-320mm by a long margin.

I will have a look for my test comparison shots. Maybe I had a bad copy.
I honestly found the 80-320 superior to the 80-200. The M zoom wasn't "bad" but it took an IQ hit when cropping pics. Short of doing 100% crops, the M is more than usable

My 80-320 never gets used over 250mm which is why I'm looking for a 300/400mm prime...but having said that...the lightness, compact size (relative), and IQ is good enough to keep it around. Will I when I get a long lens? We'll see...I want to but finances probably won't let me.

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