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Forum: Troubleshooting and Beginner Help
08-11-2016, 03:01 AM
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Thanks for the suggestions!
So the other lenses I've tried are: DA-L 18-55 kit, F 35-70 f3.5-4.5, M 50 f1.7.
I'll try the whole camera clean and reset, and clean the lens contacts better.
This is what I want to do, however the only other camera I have easy access to is an ME Super, which I assume wouldn't actually test the aperture mechanism of the lens? If I can find a way to access another camera to try this on I'll definitely do that. In all the other cases of mirror flop I've seen on here it ended up being the camera (except where the aperture lever on the lens was bent which mine isn't) so I'm still feeling it must be the camera or lens contacts even though it works with the other lenses. Unfortunately since I bought the lens from a well known online auction place I don't think I have any warranty etc.
If I get to a decent shop (not many round me!) I'll see if I can try another HD 15mm. I'm hoping it's not a lens problem as the camera is easier to replace (was thinking about upgrading anyway!).
Thanks all
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Forum: Troubleshooting and Beginner Help
08-10-2016, 03:42 AM
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This is an issue about the (well documented) K-r mirror flop problem. I'm posting because my problem seems to be slightly different to others, and because I have one main question I'm hoping someone might be able to answer.
The problem:
-With a newly acquired (but second hand) HD 15mm, my 4 year old K-r (so out of guarantee) worked absolutely fine for around 300-400 shots, then the mirror suddenly started to fire randomly every time I pressed any button, with the viewfinder heavily blurred and dim and the camera basically useless due to the mirror (couldn't take pictures or anything). This seems to be typical of the mirror flop issue others have noted.
-I fixed the problem by unmounting the lens, pushing down the aperture lever inside the camera and releasing (this was a trick posted somewhere on this forum), then mounting another lens (the camera works fine with all my other lenses, both automatic and semi/fully manual). Once I've done this the camera works as before with no issues.
-Now every time I mount the HD 15mm I can take one shot, then for a few shots the viewfinder etc. will work (though seems to be a bit out of focus?), but if I fire the shutter it seems to work without actually taking a picture (which is pretty useless), before descending into the random mirror flop with every button and having the viewfinder totally blurred and dim, requiring the aperture lever fix.
The Solutions I have Tried (No success)
-I've tried using the AA battery holder as some people mentioned this had solved their flop.
-I've updated the firmware.
-I've cleaned the contacts (both camera and lens) though admittedly not very carefully.
-Lastly, not a fix but I've had a look at the lens aperture lever, cannot see any bends or anything, it moves back and forth smoothly when pushed.
What I Want to Know
-If anyone has any ideas about how to fix this that would be awesome... but what I really want to know is whether this seems to be a problem with the camera or the lens?
-I'd be more surprised if it was the lens as I can't see anything wrong and the camera is getting on a little, but since the camera works with all the other lenses I'm becoming less sure...? I've been thinking about upgrading and this almost pushed me into doing so sooner than I was going to, but I don't want to if it's a problem with the lens rather than the camera- as the HD 15mm is my most significant investment (typical that it would be the one that doesn't work...) I'd like it to work on any new camera!
-I'm also particularly confused as the camera and lens worked fine for quite a while before breaking so I figure the lens aperture lever can't be bent or something like that.
Thanks,
Nick
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Forum: Photo Critique
10-29-2013, 03:53 PM
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The dotted star trails, I think, are due to the time in between consecutive shots. If you used the interval function on your K-5 (presumably you did since you are using a stacking software), then unless you make the interval between photos exactly the same time as you shutter speed, there will always be some period of time where the camera is not taking an image, but the stars keep moving. Therefore when you stack the photos, the trails appear dotted due to the missed movement of the stars in between shots.
There are two ways to try and eliminate this: either you could take one long exposure instead of several shorter ones (depends on how much light pollution there is as to whether this will work or not- lots of light pollution means that stacking is the only option really, but if there is very little pollution then you could try this). The other way is to reduce the time in between shots (the missed movement time), so for example, if you are using a shutter speed of 15s, then use an interval time of 16 or 17s rather than 30s or so. This does run the risk of filling up the buffer quicker, so it is possible than one interval might be missed altogether (due to a full buffer), but I have never had that issue when I have done it.
Hope this helps!
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Forum: Troubleshooting and Beginner Help
04-08-2013, 02:25 AM
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I have noticed that when I took long exposure pictures recently, some of them had purple bands on them- resulting in discolouration, differential exposure in specific places, and loss of contrast. The bands were always the same in all the pictures, so that meant that it wasn't flare or something else to do with light from the lens since that light is different depending on the photo. To find out more, I did some tests and to cut it short, I believe that the issue is caused by light entering the viewfinder and reflecting off the inside of the camera, and it only appears when the exposure is long enough, or the sensitivity is high enough for it to affect the photo.
The first image is of the effect (exaggerated somewhat)- 9 minute exposure at ISO 200 with the viewfinder exposed to an (admittedly not too bright) open window).
The second image was taken in exactly the same scenario, but with a piece of card covering the viewfinder.
As you can see, it can be quite an issue, and has ruined several photos when I haven't noticed it until too late (as it mainly happens in bright sunlight, the LCD screen upon which I view the image after taking does not have enough contrast to notice the effect, unless I look very carefully, which I don't). Just as some background, in general the pictures which show this effect are IR photos (hence the long exposure).
I post this because I am interested whether anyone else has had this issue, and particularly whether it is just my camera (a K-r), whether it is just the K-r, or whether all cameras do this to some extent, since I can find just about nothing elsewhere on the internet and this forum about this issue.
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Forum: Photographic Industry and Professionals
01-19-2013, 12:05 PM
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I would like to enter this giveaway
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