Do 10 year old K1 lenses still fit the new K1

All lenses with the Pentax K mount made in the last few decades (I'm not sure when the started the K mount system--the '70s? The '60s?) will fit the Pentax K-1 and earlier cameras. The only difference in the modern K mount lenses and vintage K mount lenses is in the capabilities of the lens itself. In other words, most K mount lenses produced today are capable of allowing for autofocus and programmed modes such as full-auto exposure, aperture-priority, shutter speed priority or full manual control. Most, if not all DSLR cameras made today can be used in all of these modes, provided the lens allows for it, but, unlike most major brands (which changed their mounts), all Pentax cameras that use the K mount can be used with vintage K mount lenses, though limited by the auto capabilities of the particular lens. For example, I have lenses I bought 30+ years ago for my Pentax P-3 35mm film camera that was capable of full-auto program, aperture priority, shutter priority or full manual modes, but not autofocus, so I can use these lenses on my modern Pentax cameras with any of the program modes, but they don't have autofocus capabilities, so focusing has to be done manually (which I usually do, anyway). The same holds true for any vintage K mount lens, even older basic, totally manual lenses made for even older 35mm film cameras, although if the older lens was not made to have automatic functions, your modern camera's automatic functions will not operate, but you can still use it by manually setting all parameters, like "real" photographers did "in the old days". This can be very useful if you come across an older 35mm camera with extra lenses in a yard sale or pawn shop, because you can get some very nice, long or specialty lenses that you can use (if you know how) at a very cheap price and just toss the film camera. (However, if you're buying old lenses, just be sure to check well for scratches and mildew growth inside the lens.)

Why does it say it has aps-c crop mode with k mount lenses?

ASP-C cameras have a smaller sensor 1.5x than a full sensor camera which has the same size sensor as the old 35mm film frame 24 x 36 mm full frame The K 1 and K 1 II allows you to use a crop mode to simulate the ASP-C size sensor if you want

Package Dimensions L x W x H	32.5 x 16.7 x 16.4 centimetres
Package Weight	1.33 Kilograms
Product Dimensions L x W x H	21.6 x 16.3 x 11.9 centimetres
Item Weight	998 g
Brand	Pentax
Camera Lens	35 Mm
Colour	Black
Continuous shooting speed	6.4 fps
Has image stabilisation	Yes
Included components	Camera Body Only
Max Focal Length	35 Millimetres
Memory Slots Available	2
Min Focal Length	30 Centimetres
Minimum shutter speed	30 seconds
Model year	2018
Plug profile	1 x Hot Shoe Mount
Part number	Pentax K 1 Mark II Full Frame
Viewfinder Magnification	0.9-1.0x
Water Resistance Level	Not Water Resistant
Zoom Type	Optical Zoom
Expanded ISO Maximum	819200
Autofocus Points	33
Focus type	Auto Focus
Aperture Modes	F2.8-F5.6
Style	Camera Only
Photo Filter Thread Size	49 Millimetres
Maximum Format Size	APS-C
Effective still resolution	36 MP
Guaranteed software updates until	unknown

Pentax K-1 Mark II Full Frame 36MP Weather Resistant DSLR with 3.2" TFT LCD, Black

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