Telephoto focal length
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Lens category
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Lens mount
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Pentax K Lenses that have a 100mm or longer focal length

#1

Pentax SMC DA FA 100mm f/2.8 WR Macro

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"It is light weight, very smooth, very sharp images" bhphotovideo.com

 
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Quite short
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64 mm
 
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Wide aperture
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f/2.8
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Max focal length 100 mm
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Fixed aperture n/a
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Zoom range 1x
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Weight 340 g
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Min focal length 100 mm
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Aperture f/2.8
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Length 64 mm
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Diameter 81 mm
#2

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

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Wide angle lens
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18 mm
 
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Quite short
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76 mm
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Max focal length 135 mm
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Fixed aperture No
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Zoom range 7.5x
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Weight 405 g
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Min focal length 18 mm
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Aperture f/3.5
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Length 76 mm
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Diameter 74 mm
#3

Pentax SMC HD D FA 150-450mm f/4.5-5.6 DC AW

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Great telephoto lens
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450 mm
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Max focal length 450 mm
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Fixed aperture No
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Zoom range 3x
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Weight 2 kg
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Min focal length 150 mm
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Aperture f/4.5
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Length 242 mm
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Diameter 95 mm
#4

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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Wide angle lens
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18 mm
 
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Quite short
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89 mm
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Max focal length 270 mm
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Fixed aperture No
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Zoom range 15x
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Weight 453 g
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Min focal length 18 mm
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Aperture f/3.5
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Length 89 mm
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Diameter 76 mm
#5

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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Fixed aperture No
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Zoom range 5.5x
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Weight 466 g
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Min focal length 55 mm
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Aperture f/4
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Length 112 mm
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Diameter 71 mm
#6

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

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"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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Quite short
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79 mm
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Max focal length 200 mm
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Fixed aperture No
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Zoom range 4x
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Weight 286 g
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Min focal length 50 mm
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Aperture f/4
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Length 79 mm
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Diameter 69 mm
#7

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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Wide angle lens
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18 mm
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Max focal length 300 mm
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Fixed aperture No
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Zoom range 16.7x
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Weight 0.6 kg
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Min focal length 18 mm
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Aperture f/3.5
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Length 102 mm
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Diameter 79 mm
#8

Pentax SMC DA* 300mm f/4 ED SDM

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"Stellar performer. Very sharp, and works well with in-body stabilisation, which is more noticable/effective at this focal length. Suprisingly good bokeh! This has now become my default lens bushwalking, with a shorter macro and wide prime in the bag. Very versatile thanks to close minimum focus distance. Not as big as imagined. About as heavy as expected (not light, but probably good for this class of lens). Overall GREAT and well worth the investment." bhphotovideo.com

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Max focal length 300 mm
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Fixed aperture n/a
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Zoom range 1x
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Weight 1.1 kg
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Min focal length 300 mm
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Aperture f/4
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Length 183 mm
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Diameter 84 mm
#9

Pentax SMC HD D FA* 70-200mm f/2.8 ED DC AW

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Fixed aperture
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The same maximum aperture at all focal lengths
 
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Wide aperture
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f/2.8
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Max focal length 200 mm
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Fixed aperture Yes
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Zoom range 2.9x
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Weight 1.8 kg
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Min focal length 70 mm
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Aperture f/2.8
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Length 203 mm
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Diameter 92 mm
#10

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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Wide angle lens
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18 mm
 
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Quite short
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89 mm
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Max focal length 250 mm
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Fixed aperture No
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Zoom range 13.9x
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Weight 472 g
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Min focal length 18 mm
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Aperture f/3.5
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Length 89 mm
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Diameter 74 mm