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Forum: Mini-Challenges, Games, and Photo Stories
03-10-2013, 05:13 AM
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Fantastic comp. Really generous of you. I've just had a shoot which I think would really fit with the concept perfectly. I'll definitely be submitting once I've narrowed it down to the three most appropriate images.
Cheers,
Nick
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Forum: Pentax SLR Lens Discussion
02-27-2013, 04:52 AM
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Cheers,
I'll have a look at that when I get in from work.
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Forum: Pentax SLR Lens Discussion
02-26-2013, 04:00 PM
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No problem. Thanks for trying. I'll try the foil thing tomorrow. Going to bed now.
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Forum: Pentax SLR Lens Discussion
02-26-2013, 03:40 PM
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Yeah, it's a K-r so that makes sense...
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Forum: Pentax SLR Lens Discussion
02-26-2013, 03:23 PM
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Err, the camera does take pictures with the lens detached (and the front open). It's not something I've ever tried before but I kind of assumed it wouldn't, as you say. Is that a problem?
Though back to the original problem, I've just had a thought. I've used plastic Holga toy lenses on this camera which have no metal parts at all and they've always worked fine. If they didn't need grounding, would a normal lens?
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Forum: Pentax SLR Lens Discussion
02-26-2013, 02:46 PM
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It's an M and I would intend to shoot in fully manual mode with it, more often than not.
The lever looks pretty straight though. Compared it to my functioning Pentax M 1:1.7 50mm and there's no obvious difference.
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Forum: Pentax SLR Lens Discussion
02-26-2013, 02:34 PM
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Interesting. It is black. How much would I need to scrape back? My only concern is that if it isn't that, then the seller could rightly say I'd "damaged" the lens. Would a small, fairly inconspicuous patch suffice?
Photo attached.
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Forum: Pentax SLR Lens Discussion
02-26-2013, 01:40 PM
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Further experimentation seems to indicate that is is problematic at either end of the focusing, but fine in the middle. Odd.
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Forum: Pentax SLR Lens Discussion
02-26-2013, 01:22 PM
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It seems to trigger the problem when focus approaches infinity. There's a slight but perceptible resistance between the 30ft and infinity marks on the ring. It's smooth through this section when the lens is not attached. That would point to it hitting something I guess, which is a bit worrying. There's not much else there bar the mirror...
I've compared it with my old manual SMC Pentax-M 1:1.7 and my modern 40mm DA Limited and it is perceptable longer from the plate to the furthest point in. It may only be a couple of millimeters but it is obvious when looking.
How would I know if the aperture shield is too large? Is that the metal bit that sticks out adjacent to the small lever?
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Forum: Pentax SLR Lens Discussion
02-26-2013, 12:47 PM
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Hmm... I think it was Korea actually, so probably not "your" one ;-)
I guess it's always a bit of a concern when you spend a fair chunk of money on a used item, particularly a high spec one with the potential for being faulty. I'm just keeping my fingers crossed someone will give me a nice easy fix...
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Forum: Pentax SLR Lens Discussion
02-26-2013, 11:51 AM
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Hi all,
I just received my very first F1.2 lens and was very excited to give it a whirl. I've used a number of older manual lenses to good effect and never had any problems before.
Until now. I've got the Cosina Cosinon-S MC 55mm 1:1.2 (the 8-aperture blades, F1.2-F16 variant) and am mounting it on my K-r. Something mechanical seems to be interfering with the shooting process. I'm reasonably experienced with using the camera and a variety of lenses but am not so technically proficient with the mechanics to explain this easily but will try. Essentially, it will generaly take between 1 and 10 shots before refusing to take any more. It continues to click like it's taking a shot but sometimes sort of hangs like it has a very long shutter speed, but doesn't take an image. At this point I have to swap out the lens for another (any, it seems) and the camera returns to normal. All I can think is that it's something to do with the fact that the portion of the lens that sits inside the camera is considerably longer than any other lens I own and it must be impinging on some of the moving parts within the camera. Either the mirror or possible the small lever on the left hand side of the mount as you look at it (I'm sorry, I don't really know what this does).
Does anyone have any ideas why this might be or has anyone experienced anything similar? If so, any ideas what to do to resolve it? Is it a duff lens and should I return it or is this something that can be worked round? It was a reasonably expensive purchase for my budget and I need to decide what to do fairly soon so i can return it to the Ebay seller if necessary. The lens is in otherwise pretty good condition, other than a slight stiffness of the focusing ring at close distances. It'd be a shame and a pain to have to return it, particularly after doing all the research, finally plucking up the courage to go for a slightly more "exotic" lens and spending a few quid getting it.
Any help would be greatly appreciated.
Cheers,
Nick
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