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Forum: Film Processing, Scanning, and Darkroom
08-21-2016, 03:17 PM
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I might open it and see what happens to the carriage "live".... Maybe I get some idea or hints on the cause.
BTW, now it has been scanning about 20 slides with no hitch, even though from time to time it hesitates for a fraction of a second and then goes ahead....
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Forum: Film Processing, Scanning, and Darkroom
08-21-2016, 02:04 AM
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Lite update: this morning it scanned two slides after restarting and then just stopped, after a few tens of seconds the scanner "quit" trying to scan (there was a sort of click) and the SW continued to try a bit and then saved the partial scan. I tried again and it stopped at the same point. this point is more or less at the same position where the stripes started in the previous scans.
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Forum: Film Processing, Scanning, and Darkroom
08-20-2016, 03:24 PM
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Only tested with feeder, I'll try manual after a fault.
Yes, I checked used prices and it's still cheaper to fix it.
If it's the power supply, or the LEDs, why it then continues with partial scans? After the slide with the stripes, the next slides are all done correctly after a certain point, so LEDs, sensors and advancing mechanism all work, but only in part... as if lights (or sensors) are off only for the first part of the travel for each scan
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Forum: Film Processing, Scanning, and Darkroom
08-20-2016, 06:28 AM
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Thanks
in the meantime I got an answer from Nikon France, they still seem to repair it, but at steep prices if there are serious parts damaged (scan head or feed mechanism). I'm looking what the used price is and then decide. I guess I would get it cleaned as well... Still, I am curious about the cause, since:
The head seems to work, after the first error, the following scans are ok, only shorter, pointing to a problem with the feed, but then why the stripes? That's why I thought about a SW problem.
If it rests a bit after shutoff it makes another 10-15 slides before having the problem again. This points to a heating issue.
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Forum: Film Processing, Scanning, and Darkroom
08-18-2016, 12:32 AM
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My scanner, after processing many teens of thousands of slides, producer from time to time partially scanned pictures where a part (smaller or larger at each time) where it just seems to repeat the last read row of pixels, thus producing a striped image. When the scan stops to be regular, the noise changes.
After some time I can restart and it works again. If I continue scanning, the scan is black to the left and part of the slide is regularly scanned, only shorter (but the slide is completely inserted) or has the same striped appearance.
I must precise that the problem initially presented itself at longer time intervals, and it is becoming more and more frequent.
Is this an HW problem? Anybody had it and can tell me what the problem was? How costly was the repair? Can it be done by a reasonably able DIYer?
Thanks in advance
Maurizio
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Forum: Pentax SLR Lens Discussion
08-21-2014, 02:58 PM
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I was also very interested in the Samyang, but reading the Lenstip review cooled me off a bit. According to them, it's worse than the 8-16 in many respects, except a slightly better center resolution, in exchange for an abysmal corner quality. I'd love to see side by side pictures of the same subject...
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Forum: Pentax SLR Lens Discussion
08-19-2014, 11:27 AM
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That's one the things I was afraid of, and I several confirmations here… How do you see that? Different sharpness from one side to the other? Any quick way of checking that in a shop?
How did you get the exchanges and the certification by Sigma?
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Forum: Pentax SLR Lens Discussion
08-18-2014, 03:10 PM
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I use ultra wide a lot, the majority of the 12-24 pictures are at 12, and I found situations where it's not enough; of course I can take 4 pictures and stitch them together, but for some subjects it does not work.
About the 8-16 (and many Sigma lenses) I read QC is an issue and on such an extreme lens centering is problematic, I definitely have to go and test it… I use pola a lot, and that's another problem
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Forum: Pentax SLR Lens Discussion
08-17-2014, 04:18 PM
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Thanks, but I buy for the long term, so I am looking really for the best, not the best compromise. I had it and it's quite good at 10, but worse than the 12-24 overall, that's why I am looking at the lenses I listed. Looks like nobody has tried the Samyang yet...
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Forum: Welcomes and Introductions
08-17-2014, 03:51 AM
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Not if I have to carry them in my backpack. How are you using the 28 shift? On film? Or for panos?
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Forum: Welcomes and Introductions
08-15-2014, 03:07 PM
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Thanks!
The one in Dayton? Been there a long time ago, mid nineties… must have a lot of new exhibits….
The 12-24 repair costs as a new 10-20 or so, only have the calibration instruments at Pentax Paris… not worth it, I can still use it, just a bit awkward, but time is normally not that critical on such lenses.
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Forum: Pentax SLR Lens Discussion
08-15-2014, 03:01 PM
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...but repairing it is out of the question, they asked me an arm and a leg, and I can still use it, it's just a bit uncomfortable: prefocus, it doesn't, and reach for the front to pull it back a tad. Here is a pic I took today with the 12-24, seems the fall did not produce any more damage than that.
With the money to repair it I can easily buy the cheaper lenses I mentioned (or add a couple hundreds for the 8-16) and have both. The point is, are they good enough to replace it when I want to travel lighter, for instance? Of course I want to go significantly wider, otherwise there's no point. On the other hand, it would be one more lens to carry around on long trips, when I normally take with me almost all lenses and choose day by day which ones I might need, is it worth it?
If the 8-16 is good enough, then I could couple it to the 17-70 on the other body and I would be covered. Or, if not, and the samyang, being prime, were very good, it would be probably it on one body (most of the pictures I take with the 12-24 are at the wide end anyway) and the 17-70 on the other.
About the 8mm fisheye, I have it, I used it today too, but defishing it I think would somewhat worsen definition and reduce the angle, or am I wrong? Also, how does one defish it, I read it has a different projection from all other fisheyes,, doesn't it mean the tools that work with normal fisheyes wouldn't work?
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Forum: Pentax SLR Lens Discussion
08-15-2014, 04:52 AM
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I am in a pickle currently on ultrawides. The 12-24 i own fell to the ground and took up a certain slack, which means it works but sometimes I have to push it back otherwise it does not reach infinity focus.
I am now in doubt whether to keep it and buy the Samyang 10mm or the Sigma 8-16mm to go wider, or replace it altogether with the Sigma 8-16 or the 10-20 f3.5.
Any first hand experience? I am first of all interested in resolution as some other defects can be corrected, bad resolution not.
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Forum: Welcomes and Introductions
08-15-2014, 04:25 AM
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I am a longtime Pentax user (from an MX in the seventies then another, then a Z10, Z1, Z1p to the jump into digital with K10D, K20D, K5 and now K3, plus my father's P30, i still own most of them). I also collected a number of lenses, trading some in and out (I should rationalize my 20-70mm lineup, I know, any good offers?) while I am in a pickle currently on ultrawides. THe 12-24 fell to the ground and took up a certain slack, which means it works but sometimes I have to push it back otherwise it does not reach infinity focus. I am now in doubt whether to buy the Samyang 10mm or the Sigma 8-16mm. This of course would influence the choice of which second zoom to keep for the higher focus range.
I also am in search of something longer than the 300mm, the Sigma 600 I recently bought is not great and in any case is too long for many uses.
I am photographing mainly during my travels (landscape, architecture, animals and flowers), but I have also some side shows due to my other interests, i.e. aircraft/military and underwater photography.
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