Adapter for Pentax 645 lenses

[rssfhs]

I was wondering if it's possible to use those old manual focus Pentax 645 medium format lenses on a Canon EOS. I've heard about adapters for some other Pentax lenses...

[rssfhs]

Anybody?

[Juan Zas]

I hope this link can help you to clarify ....

http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00D2l5&tag=

[Juan Zas]

Some more

K Adaptor for 645 Lenses (to use 645 lenses on 35mm body)
139.99 Sterling Pounds !!

here in this site:

http://www.pentaxuser.co.uk/pages/pricelist/pl_645N.htm


Use GOOGLE with keywords like "Pentax 645 adaptor" or "K Adaptor for 645 Lenses"; and similar and you can find the stuff ...

Good luck

[rssfhs]

Some more

K Adaptor for 645 Lenses (to use 645 lenses on 35mm body)
139.99 Sterling Pounds !!

here in this site:

http://www.pentaxuser.co.uk/pages/pricelist/pl_645N.htm


Use GOOGLE with keywords like "Pentax 645 adaptor" or "K Adaptor for 645 Lenses"; and similar and you can find the stuff ...

Good luck

Thanks, I saw that adapter, but isn't it for a Pentax 35mm body? I want to use the lenses on my Canon.

[jojohohanon]

but then you can use a K - to - EF adaptor to get it onto your body.

Incidentally, do stacked adaptors act like extension tubes, potentially losing infinity focus?

[rssfhs]

but then you can use a K - to - EF adaptor to get it onto your body.

Incidentally, do stacked adaptors act like extension tubes, potentially losing infinity focus?

I would imagine they do. Might be good for macros. :-)

[embdude]

Incidentally, do stacked adaptors act like extension tubes, potentially losing infinity focus?

No.

Although adapters stacked or otherwise are extension tubes by nature they are designed to only extend as much to get the same extension it would have had on the thicker bodied camera.

[rssfhs]

No.

Although adapters stacked or otherwise are extension tubes by nature they are designed to only extend as much to get the same extension it would have had on the thicker bodied camera.

Yes, but what if you use two of them?

[Jon]

They're still not going to add any extra. Take the Pentax-645 lens above and a 300D. Pentax 645-Pentax K adapter fits to a PK mount camera with infinity focus, by design. Pentax K lens on PK-EF-S adapter gives infinity focus (note, per earlier posts here, PK on EF won't give infinity; there is a touch of extra extension in that case). So replacing the PK lens with the P645 lens on PK adapter on the PK-EF-S adapter will still give infinity focus.

[Andy_T]

There is one available at novoflex ... but it is quite pricey (~500 EUR)

http://www.novoflex.de/english/html/products.htm

--> Adapter, select 'Canon EOS' and '645' from list, then look up the result MAMRING+CANA-AF in the PDF price list.

I'd check ebay with the search '645 eos adapter' or similar ... it might yield cheaper results.

Buze made a K-adapter (Pentax k-mount lens on EOS) himself, and obviously 645->K-mount adapters are available.

Another suggestion, of course, if you want to have manual focus lenses for your Canon EOS, is to get one of the cheap adapters (M42, NOINK, P6, C/Y) and search for corresponding lenses. Especially in the M42 mount, you'll find some very nice and quite affordable lenses on eBay.

Best regards,
Andy

[davidfig]

Yes, but what if you use two of them?

If the two include the focal plane alignment, which they well. You could lose infinity. This is especially true for manual lenses, as they do not have slop in them that was added to auto lenses.

[Andy_T]

Each of the two adapters must preserve the distance to the focal plane in order to allow infinity focus.

If you stack two converters on top of each other that fulfil this requirement, and the tolerances are within the specifications, then the total distance should be ok.

Best regards,
Andy

[rssfhs]

Each of the two adapters must preserve the distance to the focal plane in order to allow infinity focus.

If you stack two converters on top of each other that fulfil this requirement, and the tolerances are within the specifications, then the total distance should be ok.

Best regards,
Andy
And if not, I should get out the duct tape, right? ;-)

[Andy_T]

... or the grinder.

Depends on the way the tolerances add up.

I remember that ther's some collateral to Murphy's law that tolerances always add up in the way that it is most inconvenient for your application :lol:

Best regards,
Andy