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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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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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Diameter 74 mm
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Aperture f/3.5
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Weight 405 g
#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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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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Diameter 71 mm
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Aperture f/4
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Weight 466 g
#3

Pentax SMC DA FA 100mm f/2.8 WR Macro

Pentax SMC  DA FA 100mm f/2.8 WR Macro

"It is light weight, very smooth, very sharp images" 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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Diameter 81 mm
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Aperture f/2.8
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Weight 340 g
#4

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

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

"This lens is a great fast focusing, sharp lens. I have been using this lens to take bird photos for the last few weeks and it does a marvelous job. The greatest advantage of this zoom is its size. It breaks down to being only a 1/4 inch longer than my 18-55 zoom kit lens. I also like that is allows manual focus with AF on." 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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Diameter 69 mm
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Aperture f/4
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Weight 286 g
#5

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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Diameter n/a
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Aperture f/2
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Weight 0.8 kg
#6

Samyang 135mm f/2 ED UMC Pentax K

Samyang 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 121 mm
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Auto focus No
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Diameter 82 mm
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Aperture f/2
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Weight 0.8 kg
#7

Sigma 18-300mm f/3.5-6.3 DC MACRO HSM Contemporary Pentax K

Sigma 18-300mm f/3.5-6.3 DC MACRO HSM Contemporary Pentax K
 
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Great zoom range
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16.7x
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Max focal length 300 mm
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Min focal length 18 mm
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Zoom range 16.7x
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Length 102 mm
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Auto focus Yes
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Diameter 79 mm
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Aperture f/3.5
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Weight 0.6 kg
#8

Sigma 18-250mm f/3.5-6.3 DC Macro HSM Pentax K

Sigma 18-250mm f/3.5-6.3 DC Macro HSM Pentax K
 
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Great zoom range
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13.9x
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Max focal length 250 mm
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Min focal length 18 mm
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Zoom range 13.9x
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Length 89 mm
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Auto focus Yes
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Diameter 74 mm
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Aperture f/3.5
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Weight 472 g