KR Lens...

Posted 29/03/2012 - 16:31 Link
Hello, I have a Kr ans have just bought a lens which I thought would fit but it does not seem too. It is a hoya 28-105mm wide angle lens which is a p/k-a.r fit. The question is, should this fit or have I made a boo boo...?

No major problem either way as I didn't pay a lot at all but would like to know. Many thanks.
steven9761
Posted 29/03/2012 - 16:41 Link
If it's a PK-a fit, it should mount. Are you lining up the red dot on the lens mount with the red dot on the camera body?
gartmore
Posted 29/03/2012 - 17:21 Link
Not that it will have any bearing on fit but that lens will not be a wide angle on your camera. I wonder if the 'r' refers to the Ricoh variation of the Pentax K mount?
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
sterretje
Posted 29/03/2012 - 18:12 Link
Compare the mount with that of another lens that you have. One of the problems might be the flange that protects the aperture lever. It might be deeper and/or larger; a small surgery can solve that problem.

Does it go on, but not turn the whole way?

An image of the mount might help the more knowledgeable people here (not me ) to indicate what is wrong

gartmore wrote:
I wonder if the 'r' refers to the Ricoh variation of the Pentax K mount?
In which case it will mount but might not come off easily
Pentax K10D + Vivitar 55/2.8 macro + Super Takumar 55/1.8 + SuperMultiCoated Takumar 85/1.8 + SuperMultiCoated Takumar 135/3.5 + SuperMultiCoated Takumar 200/4 + Super Takumar 300/4
Pentax K100D + DA18-55ALII + DA55-300
Pentax K5 + FA31Ltd + M50/1.7 + DFA100WR + M120/2.8 (+ DA18-55WR at occasion)
Posted 29/03/2012 - 20:03 Link
Oh ok, how come it won't be wide angle? sorry if I am just being a little thick...

gartmore wrote:
Not that it will have any bearing on fit but that lens will not be a wide angle on your camera. I wonder if the 'r' refers to the Ricoh variation of the Pentax K mount?
Posted 29/03/2012 - 20:03 Link
Yeah it is all lined up ok, just doesn't seem to fit all the way in.

steven9761 wrote:
If it's a PK-a fit, it should mount. Are you lining up the red dot on the lens mount with the red dot on the camera body?
Posted 29/03/2012 - 20:05 Link
sterretje wrote:
Compare the mount with that of another lens that you have. One of the problems might be the flange that protects the aperture lever. It might be deeper and/or larger; a small surgery can solve that problem.

Does it go on, but not turn the whole way?

An image of the mount might help the more knowledgeable people here (not me ) to indicate what is wrong

gartmore wrote:
I wonder if the 'r' refers to the Ricoh variation of the Pentax K mount?
In which case it will mount but might not come off easily
Ahh I see, on initial inspection it looked the same but the little bit of plastic around the aperture is slightly deeper... nail file?... lol
johnha
Posted 29/03/2012 - 21:51 - Helpful Comment Link
The longer flange around the aperture is present on some independent KA or Kr lenses (often they had both contacts). I think this flange is only a problem on cameras that have the two gold contacts about 5 o'clock on the mount. I first had this problem on my Z-1 (they fitted all my previous film bodies).

If it is a Kr with the Ricoh pin, this link shows how to remove the pin (takes five minutes). Some are held in by a sprung plate rather than the screw mentioned on this site.
sterretje
Posted 30/03/2012 - 04:44 Link
TheLaughinPig wrote:
Oh ok, how come it won't be wide angle? sorry if I am just being a little thick...
Due to the smaller sensor size, 28mm on APSc will give a field of view similar to 42mm on full frame. And 42mm on full frame is not considered wide angle.

On full frame, 35mm is considered the beginning of wide angle range and 28mm is considered wide angle. 24mm is the turning point between wide angle and ultra wide angle (still considered being wide).

Due to the smaller sensor, the equivalent numbers on APSc (roughly) are 24, 18 and 16.
Pentax K10D + Vivitar 55/2.8 macro + Super Takumar 55/1.8 + SuperMultiCoated Takumar 85/1.8 + SuperMultiCoated Takumar 135/3.5 + SuperMultiCoated Takumar 200/4 + Super Takumar 300/4
Pentax K100D + DA18-55ALII + DA55-300
Pentax K5 + FA31Ltd + M50/1.7 + DFA100WR + M120/2.8 (+ DA18-55WR at occasion)
Edited by sterretje: 30/03/2012 - 04:46
dfryman
Posted 30/03/2012 - 18:23 Link
Compare the mount with that of another lens that you have. One of the problems might be the flange that protects the aperture lever.Comment Image

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