Telephoto focal length
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Pentax K Lenses for less than $500 that have a 100mm or longer focal length

#1

Pentax SMC DA 18-135mm f/3.5-5.6 ED AL DC WR

Pentax SMC  DA 18-135mm f/3.5-5.6 ED AL DC WR
 
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Great zoom range
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7.5x
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Max focal length 135 mm
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Min focal length 18 mm
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Zoom range 7.5x
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Length 76 mm
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Auto focus Yes
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Weight 405 g
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Aperture f/3.5
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Diameter 74 mm
#2

Pentax SMC HD Pentax-DA 55-300mm f/4-5.8 ED WR

Pentax SMC HD Pentax-DA 55-300mm f/4-5.8 ED WR
 
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Great telephoto lens
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300 mm
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Max focal length 300 mm
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Min focal length 55 mm
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Zoom range 5.5x
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Length 112 mm
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Auto focus Yes
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Weight 466 g
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Aperture f/4
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Diameter 71 mm
#3

Pentax SMC DA FA 100mm f/2.8 WR Macro

Pentax SMC  DA FA 100mm f/2.8 WR Macro

"I bought this in conjunction with the 160fc ringflash, perfect match for this lens.. Aside from being exellent at macro, I found this lens to be stuningly vibrant and contrasty for normal shooting.." bhphotovideo.com

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Max focal length 100 mm
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Min focal length 100 mm
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Zoom range 1x
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Length 64 mm
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Auto focus Yes
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Weight 340 g
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Aperture f/2.8
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Diameter 81 mm
#4

Pentax SMC DA 50-200mm f/4-5.6 ED WR

Pentax SMC  DA 50-200mm f/4-5.6 ED WR

"Great lens, exactly as advertised. Easy to focus. Perfect for the camera body." bhphotovideo.com

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Max focal length 200 mm
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Min focal length 50 mm
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Zoom range 4x
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Length 79 mm
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Auto focus Yes
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Weight 286 g
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Aperture f/4
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Diameter 69 mm
#5

Pentax SMC DAA 18-270mm f/3.5-6.3 ED SDM

Pentax SMC  DAA 18-270mm f/3.5-6.3 ED SDM
 
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Great zoom range
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15x
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Max focal length 270 mm
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Min focal length 18 mm
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Zoom range 15x
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Length 89 mm
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Auto focus Yes
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Weight 453 g
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Aperture f/3.5
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Diameter 76 mm
#6

Rokinon 135mm f/2 ED UMC Pentax K

Rokinon 135mm f/2 ED UMC Pentax K
 
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Wide aperture
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f/2
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Max focal length 135 mm
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Min focal length 135 mm
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Zoom range 1x
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Length n/a
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Auto focus No
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Weight 0.8 kg
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Aperture f/2
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Diameter n/a
#7

Samyang 100mm f/2.8 ED UMC Macro Pentax K

Placeholder
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Max focal length 100 mm
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Min focal length 100 mm
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Zoom range 1x
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Length 122 mm
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Auto focus No
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Weight 0.7 kg
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Aperture f/2.8
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Diameter 73 mm