DHooch

Pentax prides itself that their cameras can use any Pentax lens ever produced. Does anyone know if Pentax's newest K1 Full Frame Camera can use previous digital camera lenses, without losing the corners/edges of the pictures, given the fact that it has a larger sensor, compared to, for example, the K5?

twowindsbear

What size is the new camera's sensor? What size are the old cameras' sensors?

DHooch

I have a Pentax K5 II and am thinking about buying a Pentax K1. I have several Pentax auto focus Zoom and non-auto zoom, non-zoom lenses. I want to know if I can use all of my existing lenses.

blackest Loc: Ireland

The simple answer is yes, natively every thing from the original K mount lens from around 1975 -77 to the modern day. Some pentax da lenses designed for crop sensors can be used full frame but the k1 has a crop mode for the lenses that don't fully cover the image circle.
The std 18mm to 55mm DA kit lens is useable full frame from about 24mm upwards. for pre K mount lenses with the m42 mount there is a simple adapter which sits inside the k mount.

Lens capabilities depend on the generation of lens, but all can take advantage of IBIS and focus confirmation.

I'm looking at the K1 myself, I was considering the K1 MkII but then I found the accelerator board is doing noise reduction and it can't be turned off. Granted that means the higher ISO in the K1 MkII isn't available but honestly really high ISO photographs always look terrible.
AF-C mode is supposed to be better in the K1 MKII If it wasn't for the doctored raw files I'd be going for the K1 Mk II but no thankyou and for some reason Ricoh are charging more for the original k1 than the k1 Mk II.

DHooch

Thanks. I'll take that into consideration.

Bison Bud

To be a full frame sensor it should be the same size as 35mm film (give or take mere fractions) and lenses that worked on 35mm film should have no problems with the K1 sensor. While I couldn't afford the K1, I did recently upgrade to the K3 and being able to use my old K-1000 lenses was a real factor in the decision to do so. I am very pleased with the upgrade, but will admit that getting used to manual focus again was a bit painful. Good luck and good shooting to all.

A10 Loc: Southern Indiana

Love my K-1 and use my K-3 as my 2nd camera at events.

DHooch

Thanks, all of you, again. I have used my K5 II for video and it works out ok. I like the fact that the K1 has a tilt screen and more video formats. Video is only secondary to my stills, but, I'm trying to get away from my Sony video camera so I can travel lighter. My Sony does a nice job. I'm looking for a camera that does just as good a job. I want to stick with Pentax because of my lenses. Plus, I don't want to get into the Nikon/Canon debate. 😁

amfoto1 Loc: San Jose, Calif. USA

The only possible answer is "Maybe".

It's hard to say for certain, since you haven't specified what lenses you have.

Pentax has made a number of "crop only" auto focus lenses in recent years. They also continued to make a number of full frame capable, even while they were only offering crop sensor cameras.

Vintage, manual focus lenses from the days of film will mostly be full frame capable (though Pentax also made medium format and even a cute little 110 film based system, they even still make medium format digital.... the lenses of which would not be usable on a modern FF DSLR).

There also have been a lot of third party (Sigma and Tamron) crop only lenses made for Pentax.

BuckeyeBilly Loc: St. Petersburg, FL

See if you can get any further information from this Pentax Forum website:
https://www.pentaxforums.com/articles/photo-articles/pentax-k-1-lens-compatibility-guide.html

DHooch

Thank you. This link was quite helpful.

lsimpkins Loc: SE Pennsylvania

There are adapters that permit the use of the MF 645 digital lenses on a K-mount camera body. Quoting from the Pentax Forums Lens Compatibility guide (https://www.pentaxforums.com/articles/photo-articles/pentax-k-1-lens-compatibility-guide.html) "You can also adapt medium format lenses. Pentax 645 mount lenses require the Pentax Adapter K for 645 Lens, or a third-party equivalent. As this adapter is a simple tube, adapted 645 lenses will work just like screw mount lenses in the sense that their diaphragms are operated manually. Focusing is also manual."