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02-13-2015, 11:10 AM   #1
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lens adaptor

i am new to the dslr world. wanted to know if there is any adaptor which allows us to use a cannon or nikor lens on pentax k30. and how much such adaptors cost?

02-13-2015, 11:44 AM   #2
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To me it seems impossible to use a Canon lens on a Pentax DSLR, although using a Nikkor lens is theoretically possible.
It is a question of flange focal distance (register): Nikon register is longer than Pentax one, Canon register is shorter than Pentax one.
See Flange focal distance - Wikipedia, the free encyclopedia for more information.

Albeit it is possible to use a Nikkor lens on a Pentax DSLR, you have to keep in mind that automatisms (aperture, focus and so) will be full manual because Nikon-to-Pentax adaptation ring don't provide any automatism.
02-13-2015, 12:09 PM   #3
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Adaptist - Home

But the Nikon lens must have an Aperture ring. And using the new mount makes the camera non-WR. The other type of adapter for Nikon lenses needs an optical element for infinity focus. It acts like a very short teleconverter.

Older, non-AI Nikon lenses, can be force fit into a K-mount. AI lenses need to be modified by trimming down the AI linkage. AF Nikon lenses can not be used this way.
02-13-2015, 04:32 PM   #4
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QuoteOriginally posted by mehulmandan Quote
i am new to the dslr world. wanted to know if there is any adaptor which allows us to use a cannon or nikor lens on pentax k30. and how much such adaptors cost?
The short answer IMHO is that no, Canon and Nikon lenses cannot be adapted for everyday use.

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02-13-2015, 04:46 PM   #5
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QuoteOriginally posted by mehulmandan Quote
to use a cannon or nikor lens on pentax
There's just way too much good Pentax glass out there to worry about fitting all that other inferior stuff.
02-13-2015, 05:18 PM   #6
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it depends on the nikon can use some of the old nikon lenses with an adapter but you won't have AF/AE. You will need to use stop-down metering on the K-30
I have some old Nikor glass that I can't wait to use on my K-3
Nikon AI Lens Adapter for Pentax K2000 K200D K110D K20D K 30 K 7 K x K R K M | eBay
02-13-2015, 06:21 PM   #7
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Why bother, there is heaps of good old glass around by some of the best lens makers in the business, in K mount or screw mount ready to just fit up and use.
02-14-2015, 07:06 AM   #8
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There used to be a company online (located in Spain) which would switch out mounts or sell you a kit for it. By the time you were done, you have spent a lot of time and money, and you have a lens with virtually no AE functions. If you have more than one lens is probably just about as cheap to get a Sony NEX body and a <$20 adapter. The combo will work with more autoexposure functions and more convenient stop-down than the modified lens on a Pentax DSLR.

If you want to use several different SLR mounts, mirrorless is the easiest way to go because the focal distance is so much shorter it is not an issue to get a cheap adapter for any SLR lens.

Last edited by GeneV; 02-14-2015 at 07:13 AM.
02-18-2015, 10:14 AM   #9
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thanks everyone for yr kind opinion annd advice

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