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Forum: Pentax News and Rumors 2 Days Ago  
Lens roadmap: Tanaka-san spills the beans
Posted By tibbitts
Replies: 195
Views: 10,392
Yes but there are many reports of decentered Pentax lenses too - and not just from me (not that I haven't been responsible for quite a few.)
Forum: Troubleshooting and Beginner Help 02-28-2019, 06:06 PM  
Better image quality with DA-L 18-50 than with Sigma 10-20 f/3.5, how so?
Posted By tibbitts
Replies: 13
Views: 859
It almost looks like there could be some sharpening happening in the one image but not the other. You are sure these are made from raw images with no process in or out of camera being done?
Forum: Pentax SLR Lens Discussion 02-18-2019, 11:55 PM  
What K3 settings for landscape?
Posted By tibbitts
Replies: 11
Views: 636
What are "mixed results"? Mixed in what way?
Forum: Pentax SLR Lens Discussion 02-18-2019, 09:26 PM  
K-1 and the DA 55-300's while waiting for a DFA 70-300
Posted By tibbitts
Replies: 11
Views: 778
I have owned multiple (I think five, I lost track) Pentax 55-300s and would say that a good copy of a 55-300 (DA with or without HD) is in the same class as my 70-300 Tamron, but I have only my 16mp bodies to test them on. The difference is mostly in terms of the Tamron's excessive purple fringing under certain conditions, especially at the long end. Both can produce good pictures. The non-rotating filter mount on the Pentax is nice, although honestly I often forget to rotate my polarizers when necessary with any of my lenses. Realistically minor focusing differences don't rotate the polarizer enough to matter - it's completely forgetting to rotate the polarizer when I change the angle or orientation of an image that usually does me in. Now I use the 60-250 Pentax, but hate carrying it. And I still forget to rotate the polarizer when I have to. I do think it's trickier to use the 60-250, in a couple of ways - partly just because it's faster so you have to focus more accurately if you take advantage of that. The 60-250 gives good results across the (crop) frame from wide open, especially from 60-200mm or so, while the other lenses improve more when stopped down. It wouldn't surprise me if the Tamron was horrible at the edges/corners on full-frame, but I have no experience with that.
Forum: Pentax SLR Lens Discussion 02-16-2019, 07:51 AM  
Sigma 70-300mm versions
Posted By tibbitts
Replies: 14
Views: 672
In terms of 3rd party lenses in that range, I only have the Tamron 70-300. I've had two copies of it; both were okay optically but one had an assembly issue (it was new so I returned it.)

I've had many new copies of the 55-300 Pentax, both the original DA (metal) and with the HD coating. The optical variation was shocking - some were truly horrible.

So I think I'd look to the new Pentax 55-300, although not really since my newest body is a K5. But if I had a newer body I would try the newer lens and hope for better quality control.

Good copies of the Tamron and older Pentax seem to me pretty similar on my 16mp bodies except that the Tamron has worse purple fringing. They can both take nice pictures. The Pentax 60-250 is better than either one, although mine also had initial quality problems (it needed a +10 focus adjustment.) I sent it for warranty repair and Pentax fixed it so it's working with a 0 adjustment now. On the other hand, a copy of that lens that I rented had signs of focus motor failure. My 60-250 has been fine so far.
Forum: Troubleshooting and Beginner Help 02-15-2019, 05:52 PM  
Tammy 17-50 lens or K-5 body causing major issues - return lens or replace body?
Posted By tibbitts
Replies: 7
Views: 1,052
My 17-50 Tamron has been adjusted twice by Tamron and each time it has come back needing -10 on the K5. I did not send the body with the lens. Another sample I tried was also -10. Both had connectivity issues randomly on both my bodies, but Tamron fixed mine (I didn't try to have the other sample fixed.) So possibly -10-ish is just how Tamron adjusts the lens. I imagine they could do better if they had a body to adjust it on.

Your old lens looks like a good copy, and you did an excellent job of providing those test images. Mine is not great at f2.8. I'm not sure there is much performance difference between two good copies of the Tamron vs. the Sigma but I agree the Tamron is more physically appealing (smaller, smaller filter.) I only have a K5. I wonder if I bought a 24mp body I'd have to replace all my lenses, but I'm really discouraged by the difficulty of getting good copies (all brands including Pentax.)

I do have two K5 bodies which helps me eliminate body issues when evaluating lenses.
Forum: Pentax SLR Lens Discussion 12-25-2018, 02:03 PM  
One more time: DA* 16-50mm vs. Tamron 17-50mm F2.8 (AF adjustment)
Posted By tibbitts
Replies: 21
Views: 1,412
I only have the Tamron. I had a problem with it losing contact with any body that Tamron fixed on the 2nd try. At least in the U.S. I'm guessing the body (probably just one) that Tamron uses for calibration is off by 10, which is a fairly huge factor given that my Pentax bodies have only an adjustment range of +/-10, since they calibrated my lens twice now with the same result.
Forum: Pentax SLR Lens Discussion 08-11-2018, 07:21 PM  
experiences with 16-85mm
Posted By tibbitts
Replies: 21
Views: 2,419
Yes, none of my other zooms behave this way. Other zooms have much worse barrel wobble, this lens has a reasonable tight front barrel in comparison to many other lenses. It's more like an internal wobble, and it makes the lens feel very imprecise.
Forum: Digital Processing, Software, and Printing 08-07-2018, 07:49 PM  
Differences Between Photoshop and Lightroom?
Posted By tibbitts
Replies: 35
Views: 2,192
I'm not an expert but I think the handwriting is on the wall to the extent that it would be questionable to invest in the non-CC version of Lightroom now.

I have a somewhat older PSE version and it's nice, but although it runs ACR (the raw converter), it's important that only is PSE somewhat feature-limited, its ACR "Lite" is also feature-limited compared to the the ACR is other Adobe applications. In fact I think that's a bigger limitation for most people than whatever limitations PSE itself has.
Forum: Pentax SLR Lens Discussion 07-17-2018, 08:32 PM  
Why would somebody buy the DFA28-105?
Posted By tibbitts
Replies: 104
Views: 4,169
I don't have a full frame but if I did, the only reason I wouldn't choose the 28-105 over alternatives would be that I've very often used my 16-x and 17-x aps lenses at the extreme wide end, so I'd very much prefer a 24-x on full-frame. I had a 28-x on 35mm and felt compelled to buy a 24mm to bridge the gap from my 17mm. While there are times when f2.8 would be nice, I'd prefer the size/weight of a slower lens vs. a full-frame f2.8.
Forum: Pentax SLR Lens Discussion 07-16-2018, 09:53 PM  
Some travel issues with Pentax lenses. Or: Will there be a 15-30mm f4. anytime "soon"
Posted By tibbitts
Replies: 46
Views: 3,058
During a presentation a Tamron rep said he used the 10-24 at 14mm and up on his D8xx. I believe it was the older 10-24mm - the only one available for Pentax.
Forum: Visitors' Center 06-19-2018, 09:15 PM  
K-20 need a compatible zoom for landscapes
Posted By tibbitts
Replies: 14
Views: 1,199
The way you worded it sounded like you meant there were fewer available for the K20 than for some other Pentax, but yes if you want WR the selection is limited no matter what Pentax body you have.
Forum: Visitors' Center 06-18-2018, 08:56 PM  
K-20 need a compatible zoom for landscapes
Posted By tibbitts
Replies: 14
Views: 1,199
Did you mean "aren't many choices" compared to other Pentax bodies?
Forum: Troubleshooting and Beginner Help 06-18-2018, 08:50 PM  
How to format a SD card?
Posted By tibbitts
Replies: 11
Views: 1,324
I was able to us this software in the past for a card that refused to work correctly after formatting using any other tools I tried, and have had no trouble with the card since.
Forum: Troubleshooting and Beginner Help 06-18-2018, 08:46 PM  
K200D -- battery advice?
Posted By tibbitts
Replies: 14
Views: 942
I think this may be a case where many AA bodies gradually need more power as they age, although I don't know specifically why that should be true.
Forum: Visitors' Center 06-18-2018, 08:40 PM  
Pentax K-3 II with weather proof-sealed body
Posted By tibbitts
Replies: 19
Views: 2,046
I don't understand why people are compelled to push the weather sealing issue, as we sometimes read here ("rinsing off" a body, etc.) Water damage is clearly not covered by any warranty unless it can be proven it's due to a defect - like a missing seal.

I have had my K5 damaged by water - being hit by an ocean wave. It kept working, but the next day several controls behaved completely differently than normal - they took on functions of other controls or worked the opposite of how they usual did (up became down, etc.) Another day of drying and all was well, however, and that was more than a year ago. In any case I try to keep my camera covered when I'm using it in anything more than a mist.
Forum: Pentax Full Frame 06-18-2018, 08:25 PM  
Difference in quality between 'full-frame' and C sensor images.
Posted By tibbitts
Replies: 18
Views: 2,377
I think the difference is still "grain" in the sense of noise, plus sharpness, plus depth of field. Comparisons are model-depended, though - for example if you compare a higher pixel count APS vs. a lower pixel count full frame, that's a complicated comparison.
Forum: Pentax DSLR Discussion 06-17-2018, 01:32 PM  
Pentax K-1ii VS Sony A7iii (Am I switching to the dark side?)
Posted By tibbitts
Replies: 91
Views: 7,827
Umm... in the film days we bracketed just like we do now, we just spent more money doing it. Or, we looked at the Kodachrome a week later and said to ourselves... "oops, really needed half a stop less!" We might tend to remember getting the exposure exactly right but even with external meters etc. getting that half-stop accuracy didn't happen very often for most of us.
Forum: Pentax SLR Lens Discussion 06-16-2018, 11:59 AM  
Pentax 16-50mm or Pentax 24-70mm.
Posted By tibbitts
Replies: 16
Views: 1,270
I'm surprised you found that about the image qualify, since neither the 17-50 nor 17-70 Sigmas seem to have enthusiastic comments about IQ in the corners at the wide end, even when stopped down considerably. On the other hand the Pentax 17-50 doesn't seem to generate much enthusiasm about its image quality anywhere else either.
Forum: Pentax SLR Lens Discussion 06-16-2018, 08:26 AM  
Pentax 16-50mm or Pentax 24-70mm.
Posted By tibbitts
Replies: 16
Views: 1,270
I have a 17-50 Tamron and the 16-85. I would just get another 16-85 if you can find a good one - I went through four of them and still have minor QC issues, but kept the best of the bunch. My Tamron has been serviced twice and consistently needs a 10 adjustment for AF. It's good stopped down but you have to stop down to overcome the curved focus plane.

You could try the Sigmas; the 17-50 or the 17-70. I have no experience with them. I understand the point about WR and it's very nice to have, but we all went for decades without WR and it's still raining about as much as before. I think WR is more important for bodies than lenses. I've tested and there is just not a lot of intrusion around the mount so that leaves the other rings and we don't have aperture rings any more so you're down to fewer intrusion points than before.
Forum: Pentax SLR Lens Discussion 06-10-2018, 06:28 PM  
Would appreciate advice on which lens to get!
Posted By tibbitts
Replies: 35
Views: 1,396
If you don't have an UWA, as in the case of the OP, my suggestion was that a 16-x will be dramatically more useful than an 18-x. I didn't mean to pick on 16mm but there aren't any 15-x or 14-x lenses that I know of for Pentax. There is the 17-70 Sigma and I might go for that rather than a 18-x, although sometimes 1mm is almost a rounding error so I'd have to look into the actual focal length differences in those cases.
Forum: Pentax SLR Lens Discussion 06-10-2018, 01:51 PM  
Would appreciate advice on which lens to get!
Posted By tibbitts
Replies: 35
Views: 1,396
I can't really imagine not having something wider than 18mm. I initially chose Pentax for digital because of the 16-45. 16 is a completely different perspective than 18 - which is why in 35mm I bought a 24/2.8 to go with a 28-55. Now I have the old/slow Sigma 10-20 for my Pentax, and am mostly happy with it, although even though I now have a relatively centered copy, sometimes the edge results are just horrible. On the other hand most of my Sigma photos are at 10mm and half are with a P-series split ND attached, and duplicating that setup with the 8-16 would probably be expensive and bulky. Also I use a polarizer often with the 10-20 (not as much for blue skies were you have to be careful using one as for improving foliage saturation or reducing some water reflections, both of which can result in blown highlights without the polarizer.
Forum: Pentax SLR Lens Discussion 06-10-2018, 12:28 PM  
SMC Pentax DA 60-250 F4 vs Sigma DC 18-250 F3.5-6.3
Posted By tibbitts
Replies: 11
Views: 918
I briefly owned the Sigma and now own the 60-250. Performance is not comparable at any focal length, although as in every case using medium focal lengths within the range and modest apertures are likely to produce less difference in the results. I only have 16mp with an AA filter, but the Pentax does seem to lose a little over 200mm - but it's still good and really good just a half stop or a stop down from wide open. That's something about that 60-250 - you don't have to stop it down to get good results like with many lenses. I have the 55-300 too and, well, it's not the 60-250. But as with all lenses, sometimes the copy you get matters more than the design. Also my 60-250 was +10 off on AF when I got it, so almost outside the range of my body adjustment, but then Pentax fixed it.

On the other hand, one thing I've learned from the 60-250 is that weight doesn't seem to be my friend when it comes to hand-holding, as it's often said to be. I've also learned that I need an AF body with animal eye recognition.
Forum: Pentax Price Watch 05-01-2018, 09:37 PM  
Pentax K-3 II mint from robertscamera on Ebay for 557 with coupon
Posted By tibbitts
Replies: 24
Views: 2,013
It's not mint so you should request a replacement. I purchased a K5 from them which also was described as mint, but exchanged it for another camera because there was a significant scratch on the LCD, and the shutter count was over 100,000! The second K5 they sent was indeed mint in every respect, and I believe I noticed the one I'd returned had been reduced to the next lower rating. I can't explain the shutter count - the body had some scuff marks but hadn't been used in a normal manner for 100,000+ cycles. But that was the data in the exif. I was pleased that they had no objections to exchanging the camera and the second one was as mint as could be without being new-in-box.
Forum: Pentax Camera and Field Accessories 04-29-2018, 06:30 PM  
sensor cleaning air blower for travel
Posted By tibbitts
Replies: 5
Views: 587
A quick search will turn up lots of instances of Rocket Blowers being confiscated. I've had the TSA become alarmed at mine such that now I take it out of the carry-on and hand it to them, but I think it just depends on luck if you get to keep it.

---------- Post added 04-29-2018 at 06:33 PM ----------

Interesting! I had never thought of that. I think that might be at least a partial solution. Maybe I'll try that next week.
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