Pentax 21740, 21717, 21580, 21660, 21650, 21760, 21507 manual 300mm equivalent to

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Lens	DA 300mm f/4ED [IF] SDM	DA FISH-EYE 10-17mm f/3.5-4.5ED [IF]	DA 12-24mm f/4ED AL [IF]
	300mm (equivalent to	10-17mm(35mm conversion	12-24mm (equivalent to
Focal length	approx. 460mm in 35mm	not possible)	approx. 18.5-37mm in
	format)		35mm format)
Elements in groups	8-6	10-8	13-11
Angle of view	5.4°	180°–100°	99°–61°
Aperture	f/4	f/3.5–f/4.5	f/4
Minimum aperture	f/32	f/22–f/32	f/22
Mount type	KAF2-mount	KAF-mount	KAF-mount
Minimum focus		0.14m (0.46ft)
	1.4m (4.67ft)	(Approximately 2.5cm	0.3m (0.98ft)
distance
		from front of lens)
Maximum	Approx. 0.24×	Approx. 0.39×	Approx. 0.12×
magnification
Filter size	77mm	Cannot be mounted	77mm
Lens hood	PH-RBK 77mm	Built-in	PH-RBI 77mm
Max. Diameter	83mm × 184mm	68mm × 71.5mm	84mm × 87.5mm
× Length	(3.3in × 7.4in)	(2.7in × 2.8in)	(3.3in × 3.4in)
	Approx. 1070g/37.74oz
	(with hood approx. 1160g/		Approx. 430g/15.2oz
Weight	40.91oz)	Approx. 320g/11.3oz	(with hood approx. 457g/
	(with hood + tripod attachment		16.1oz)
	approx. 1240g/43.73oz)
Soft case	S120-210	S80-80	S100-120