[mrfredsporty]

this is a true 72 yr old rookie question. monday my k1 will be arriving. i have a tamron 16-300 walking around lens that came with canon mount. is there an adaptor or anything that i can do to use this kind fun lens (also will be using new pentax 28 to 105.) i know this is a noobi question but still.......
thanks
fred from nashville

[marcusBMG]

Hi Fred, welcome.

For adaptability the considerations are
1. registration distance aka flange focal distance
2. which mounts can fit "inside" others

The canon eos has the shortest registration distance of the optical viewfinder dslr's so if a canon lens is tried on another dslr it won't focus to infinity (the lens needs to be closer to the sensor than the body of the camera can allow). And the eos bayonet mount is the widest so just no mechanical possibility of getting it to fit anyway. Only possibility would be a complete mount swap, that's has been done with MF lenses but for AF lenses pretty much it's a forget it unless one is a real DIY frankenlens enthusiast.
Conversely however if you have a canon dslr then there are lots of possibilities: PK, Nik F, CY and OM all readily adapt to fit on canon dslr
With a mirrorless dslr however everything is possible because of the very short reg distance. If you browse online for eg micro four thirds adapters (panasonic Lumix, Olympus) you will see that they can be obtained for pretty much all the common current dslr and legacy 35mm mounts.

[BigMackCam]

Also, bear in mind that even if you were able to convert the lens to a KAF3 mount, it's an APS-C lens - ie. the image circle will not cover the area of a full frame sensor, so would only be any good in crop mode on the K-1. In all honesty, I think you'd be better off selling the 16-300 and putting the money towards a full frame K-mount lens of some description.

[mrfredsporty]

Hi Fred, welcome.

For adaptability the considerations are
1. registration distance aka flange focal distance
2. which mounts can fit "inside" others

The canon eos has the shortest registration distance of the optical viewfinder dslr's so if a canon lens is tried on another dslr it won't focus to infinity (the lens needs to be closer to the sensor than the body of the camera can allow). And the eos bayonet mount is the widest so just no mechanical possibility of getting it to fit anyway. Only possibility would be a complete mount swap, that's has been done with MF lenses but for AF lenses pretty much it's a forget it unless one is a real DIY frankenlens enthusiast.
Conversely however if you have a canon dslr then there are lots of possibilities: PK, Nik F, CY and OM all readily adapt to fit on canon dslr
With a mirrorless dslr however everything is possible because of the very short reg distance. If you browse online for eg micro four thirds adapters (panasonic Lumix, Olympus) you will see that they can be obtained for pretty much all the common current dslr and legacy 35mm mounts.

great response!. sounds like "fuggetta bout it!" even if it could connect it sounds like my new pentax 28-105 would run rings around it.
fred frm nashville

[mrfredsporty]

Also, bear in mind that even if you were able to convert the lens to a KAF3 mount, it's an APS-C lens - ie. the image circle will not cover the area of a full frame sensor, so would only be any good in crop mode on the K-1. In all honesty, I think you'd be better off selling the 16-300 and putting the money towards a full frame K-mount lens of some description.

yikes....im with you on this. thanks so much
fred from nashville