Telephoto focal length
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Pentax K Lenses for less than $400 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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Length 76 mm
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Zoom range 7.5x
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Diameter 74 mm
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Aperture f/3.5
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Weight 405 g
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Min focal length 18 mm
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Auto focus Yes
#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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Length 112 mm
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Zoom range 5.5x
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Diameter 71 mm
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Aperture f/4
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Weight 466 g
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Min focal length 55 mm
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Auto focus Yes
#3

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

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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Length 102 mm
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Zoom range 16.7x
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Diameter 79 mm
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Aperture f/3.5
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Weight 0.6 kg
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Min focal length 18 mm
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Auto focus Yes
#5

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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Length 89 mm
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Zoom range 13.9x
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Diameter 74 mm
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Aperture f/3.5
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Weight 472 g
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Min focal length 18 mm
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Auto focus Yes