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Old 12-06-2012, 10:10 AM   #1
Petro
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Pentax k5 Long distance 100-1000 yard video shooting? lens selection?

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Old 12-06-2012, 10:19 AM   #2
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Old 12-06-2012, 10:21 AM   #3
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Quote:
Originally Posted by sbfuller View Post
the gov't will think you are a spy and will come arrest you on bogus charges of raping a 2 headed goat and lock you away in their underground lair at Atlantis, the not-really-lost-city.
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Old 12-06-2012, 10:28 AM   #4
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at6rc:

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Old 12-06-2012, 01:12 PM   #5
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I think I may pick up a sigma 170-500 APO instead... they are affordable used and will do everything I need much better than a telescope...

http://www.pentaxforums.com/userrevi...5-6-3-apo.html
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Old 12-06-2012, 01:21 PM   #6
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Get a mirror lens. The Beauty with a Pentax DSLR is you can use any old K-mount lens. Since mirror lenses have fixed aperture size, so light metering works whether auto-aperture works or not. I use my Sigma 600mm F8 mirror lens every once in a while. Nice donut bokeh if you get catch some highlights just right. Not terribly useful at almost 1000mm because of the DSLR factor, but perfect for your application. No need for auto focus ince it's a fixed distance away.

I bought mine at Houston Camera Exchange many years ago. Folks were going DSLR and dumping their K- and KA-mount lenses, so I paid next to nothing for it. Also bought Pentax's very last production 50mm F2 KA, for $40 off amazon. I've already got a 50mm F1.4 K, but the KA allows for auto aperture and is very compact and lightweight for traveling.
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Old 12-06-2012, 02:50 PM   #7
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im up in the air about the mirror setup... If I go mirror it would be pentax's old 400-600mm slow f8-f12

I do like this one though: SMC Pentax K 500mm F4.5

http://www.pentaxforums.com/lensrevi...F4.5-Lens.html
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Old 12-06-2012, 03:40 PM   #8
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It's up to you. It's nice if you need the speed. Big long supertele gets unwieldly. Sports and wildlife photographers need fast glass to shoot action in natural light, and they need zoom to frame the shot from a fixed vantage point. Sounds like you just need a glorified spotting scope. Location is fixed. Target is fixed distance and stationary, outdoor and likely well-lit.

I would imagine that Pentax mirror zoom would be a tough find. Great if you bag one. Anyhow, I personally prefer prime, but I'm old-fashioned.
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Old 12-06-2012, 04:34 PM   #9
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I prefer prime too for this instance, but I dont think pentax/asahi made any other mirror lenses? I really do not want to sink as low as the 150-300 dollar china or korea mirror lenses plastered all over ebay... Ive seen the 500mm f4.5 pentax going for 400 plus shipping for a decent condition k mount one. supposedly its quite a bit sharper than the 170-500mm sigma as well... I do plan on using this lense for astrophotog too on occasion but yes it will be a glorified spotter scope! ha
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Old 12-06-2012, 05:12 PM   #10
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Don't waste money on the cheap mirror lens. There are a whole bunch of 500mm F8 that are all probably knock-offs of each other, or the same cheap len rebranded.

The old Sigma 600mm F8 is no match for long glass, but performs well for a CAT. Tamron used to have a 500mm F8 -the orginal one that every body else copied. That was a good lens and worthy buy if you can find one in good condition. Do make sure it's the old original ones made in Japan. Tamron also used to make a sweet little 350mm f5.6 mirror, but I don't see too many of them around. Tamron used to be one of the best indenpendent Japanese lens mfrs. Now they're afflicted by the outsourcing virus like everybody else.

If you gonna buy K-mount, get the old heavy metal barrel with multi-coated glass, the way intended them to be.

Last edited by Volfy; 12-06-2012 at 05:15 PM.
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Old 12-06-2012, 05:46 PM   #11
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that sigma 600mm looks cheap but I cant find a k mount anywhere! I will go that route though... ive seen plenty for canon or nikon mounts for around 100
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