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Forum: Pentax K-30 & K-50 12-17-2016, 09:17 PM  
K-30/K-50 Aperture Control Problem/Black Photo Repair - How I did it.
Posted By rr1736
Replies: 86
Views: 57,669
Wow impressive great work
Forum: Pentax SLR Lens Discussion 10-04-2016, 12:26 AM  
D-FA 15-30 IQ between 20-30mm
Posted By MJKoski
Replies: 45
Views: 5,142
Oh gosh. Who said I bought 4 Distagons at once? That was during 6 year period. Those have been needed in various photography projects and then sold. That is how I do it, I only own gear I need at any given period, be it 3 months or 5 years.

Only blind monkey would sent the zoom back as serviced without checking it is in working condition. 30mm was not the only focal length in there. Same happened with K-1 body which was sent to service for white dot and black band problem - one exposure would have been enough to see the black band was not fixed.

So, wait for your own service party should you need it sometime. What is wrong in being picky? K-1 attracted me thanks to Pixel-Shift which is of zero use when lens is not in perfectly working condition. It looks very ill when one part of image is ultra sharp and other plain mess. So think what you write before laughing at someone's expense.
Forum: Pentax SLR Lens Discussion 10-03-2016, 10:54 AM  
D-FA 15-30 IQ between 20-30mm
Posted By MJKoski
Replies: 45
Views: 5,142
Think about it, it is a double-priced Tamron 15-30. I will get this fixed in one way or another. Be it another copy or another service. I would let it be if it was priced like Tamron should be. But this, no way. Do you have the lens yourself? Would you be happy to spend major $$$$ for garbage?

I have had my fair share of decentered duds with all kinds of brands. Difference is, Zeiss has been able to fix my Distagons in the past, CaNikon service has done their work as well. This will be my 4th service with Pentax gear in 3 months time. A record so far with any brand.
Forum: Pentax K-1 & K-1 II 10-05-2016, 01:10 PM  
HD Pentax-D FA 15-30mm IQ
Posted By MJKoski
Replies: 30
Views: 4,255
Online reviews give wrong impression of the 15-30. Good copy is at Nikkor 14-24 level when shooting test targets but that is it. 15mm Distagon 2.8 and 21mm Loxia / 21mm Distagon just trash it in any way you look at real pictures (The Zeiss Punch).

It depends on your experience with other gear how you look at it. Pentax should have made their own designs (like 70-200 is) to earn users' respect. Or sell Tamron lenses at The Right Price.
Forum: Pentax K-1 & K-1 II 10-05-2016, 12:40 PM  
HD Pentax-D FA 15-30mm IQ
Posted By mikeSF
Replies: 30
Views: 4,255
Yeah, I find it a good zoom, but it just does not compare to my DA21, FA31 nor DA15.
Forum: Pentax K-1 & K-1 II 08-25-2016, 12:38 PM  
Electronic Shutter
Posted By MJKoski
Replies: 13
Views: 1,897
It does in Pixel-Shift mode. Other than that, no. Kind of shame.
Forum: Pentax K-1 & K-1 II 04-30-2016, 09:42 AM  
Post your K-1 pictures!
Posted By robthebloke
Replies: 38,021
Views: 3,733,708
Forum: Pentax K-1 & K-1 II 04-28-2016, 10:37 AM  
Pentax K-1 unboxing
Posted By biz-engineer
Replies: 4
Views: 2,006
link to video here
















You Tube



Forum: Pentax SLR Lens Discussion 04-27-2016, 12:57 AM  
Starbursts on the K-1?
Posted By Adam
Replies: 25
Views: 4,741
I've now enabled filtering by aperture blades. Look for a new slider in the sidebar :)

Pentax Lens Search | PentaxForums.com

(note that blade info is missing for select lenses, mostly medium format and non-SMC)
Forum: Pentax SLR Lens Discussion 04-26-2016, 07:21 AM  
D-FA 15-30mm
Posted By MattCard
Replies: 11
Views: 1,847
I think i was not at the exact same spot , i took the 16-45 pictures 15 minutes later so there is difference there :)

I am debating if i buy this and wait to have the money for the k-1, or just get the Camera and buy this lens after, this is making me crazy as i don't have money for both :lol:
Forum: Pentax Full Frame 04-25-2016, 09:10 AM  
K1 delivery
Posted By jatrax
Replies: 108
Views: 14,706
I wouldn't be too concerned about anything Amazon states until you get a shipped email.

They now say "temporarily Out of Stock". But if you click through it also says "#1 selling new release, available since February 17th, 2016."

So what does that mean? Likely they entered the expected date in the computer a long time ago and now that the date has passed with no inventory in stock the computer defaults to the "temporarily Out Of Stock" message.

Based on the incredibly loud silence I would say no one has any K-1's in stock yet. I think the 28th is still listed as the 'official' launch date.
Forum: Pentax K-3 & K-3 II 10-01-2015, 07:45 PM  
Pixel shift may actually be a winner...
Posted By Qwntm
Replies: 62
Views: 9,194



Shot today with K3II and Tamron 17-50 2.8. I shot this a few weeks ago with a Canon 6D and 24-70 F4.0 L IS. I printed them both 12x18 and the k3II shot is miles ahead. I ordered a 16x48 and it's going to be interesting to compare that to the 6D one I got a few weeks ago.


Interesting to note what really struck me was the ease of shooting pixel shift/mirror up/IR remote. The Canon would give me fits using the IR remote and it didn't work with mirror lock up or some such nonsense. I know I was always scratching my head wondering what settings worked with what other settings. The Pentax just does what I want it to do without giving me any lip.


The AA filter on the 6D is very noticeable after shooting Pentax non AA cameras for the past few years. And pixel shift just leaves it in the dust FF or not.


Makes me wonder what the FF Pentax might be like WITH pixel shift... things are getting interesting.


Another thing about pixel shift, your lens only has to be 24mp sharp, not 50mp sharp, yet it gives you 45mp output. think about it. :)
Forum: Pentax SLR Lens Discussion 06-18-2014, 01:55 PM  
Tamron f2.8 90mm Macro Or 50-135 DA* with Marumi DHG 200 macro filter
Posted By SteveUK
Replies: 10
Views: 4,829
First a note on exactly how I came to do this stange test, I've invested in some equipment upgrades, a K3 and a Pentax DA* 50-135 chiefly, a DA21mm Limited to complement it. This kit solves well for my prime directive - capture the family, but I once had a nice macro lens and enjoyed it, so I was willing to spend a reasonable amount on a 1:1 macro too for those odd occasions in the garden, not a serious macro enthusiast then, a potterer.

I picked up a mint Tamron 90mm f2.8 lens, it arrives on a sunny English late afternoon, so I'm straight out in the flowerbed, and well its just not delivering, but there is some breeze so maybe its this. On a whim I try putting a Raynox 150 (+4.8) adaptor on my 50-135, results actually look much better, the shutter speeds are way way higher, despite it being a 49mm adapter on a 67mm lens (so visible vignetting) it feels like this is capturing significantly more light. This makes me wonder ... maybe with a more suitable adapter lens that fantastic 50-135 could challenge a real macros lens ... googling finds many +2 +4 +10 filters and a +5 achromatic one from Marumi, the DHG 200, which is a little more expensive at around 100 USD but hey I'm sticking this on the front of a pretty mean camera and a pretty mean lens, and thats a snip compared to the Tamron macro lens.

An online calculator I found suggested that effective f number of the DA* lens with a +5 macro lens would be (reported value) * 80.6/135, so when camera says lens is at f11 the real aperture is around 6.5, and that the magnification would be around 0.96, pretty much 1:1.

So without further nattering I start off with some shots of graph paper indoors using a tripod, flash and remote shutter release, mainly to check depth of field, I'm also adjusting AF, but this is not an AF test.

The graph paper shots (see below crops) told me a couple of things :
1. The online calculator was about right f6.3 on the Tamron is showing a similar depth of field to f11 on the DA*, so the DA* is going to need to be stopped down quite a bit to get reasonable depth of field.
2. Comparing the exposure graph, the DA* is actually delivering a stop or two MORE light than the Tamron.
3. Pixel peeping the Tamron wins, just, a little more fringing showing on the DA*, might be better if DA* had not been over exposed.
4. Working distance of the DA* is now great, just a little longer than the Tamron (normally the closest focus distance of the DA* is 100cm !)
(5. DA* is slightly back focussed and Tamron slightly front focussed before adjustment.)

Crop of DA* at f11


Crop of Tamron at f6.3


Secondly lets move on to something real, an orchid, also indoors and using tripod, flash and remote release. On the face of it both lenses are providing a good sharp pleasing image, slightly nicer colouring in the DA* shot, cropping heavily the DA* shows a little sharper.

Crop of DA* at f13


Crop of Tamron at f6.3


Bottom line for me then - 50-135 DA* with the Marumi DHG 200 keeps up with the Tamron 90mm f2.8 and seems do deliver more light, probably explaining my day 1 flower bed experience where the Tamron simply didn't have a high enough shutter speed to compensate for the image movement. So I've sold the Tamron, good lens, but surplus to requirements as I (obviously) need the DA* for other duties.

Just one persons experience at the end of the day, if I were a hard-core macro enthusiast I would probably keep the Tamron too - still food for thought for those who have invested in a great lens like the 50-135 DA*.
Forum: Pentax K-3 Photo Contest 04-26-2014, 06:18 AM  
Architecture Stare Case
Posted By Alcazar
Replies: 70
Views: 4,823
Forum: Pentax SLR Lens Discussion 04-27-2014, 03:31 PM  
Canon 500d + Pentax DA* 60-250mm
Posted By MJSfoto1956
Replies: 3
Views: 1,322
For those of you thinking you could use your Pentax DA* 60-250mm for close up work, the answer is: absolutely! Just add an achromat close-up lens (such as the Canon 500d) and you will have a great lightweight system. One thing I discovered is that the 58mm (with a 67-58mm step down ring) is big enough to cover everything without any vignetting at all (see photo). I suspect that the DA* 60-250mm can probably cover a full-frame sensor which might explain this behavior. For "maximum closeness", set your lens to 250mm & infinity. As shown in the attached image, you can capture an item that is approximately 1 7/8" wide (i.e. 48mm) -- which fills the Pentax crop-sensor's width, big enough for a good-sized butterfly. A quick analysis of the IQ show no noticeable chromatic aberration @ f/8 (I didn't try wide open due to the razor-thin depth of field). Hopefully, this might help someone who is on the fence. This lens continues to impress me with just how flexible it is.



other image sizes: https://www.flickr.com/photos/mjsfoto1956/14040868835/sizes/l

Michael
Forum: Pentax SLR Lens Discussion 03-13-2014, 02:52 PM  
Some DA* 50-135 Love
Posted By #chokolars#
Replies: 55
Views: 9,846
Here is a little video.. With pictures where i have used the Pentax 50-135… Camera.. K-5IIs or K-3















You Tube



Forum: Pentax K-3 & K-3 II 11-27-2013, 06:03 PM  
How much do you trust DxO Marks' tests?
Posted By falconeye
Replies: 62
Views: 9,582
I didn't read all of this thread, but I am offering my short advice:

1. DxO tests are not w/o flaws but as of today, are still the most accurate source for the kind of properties they measure (sensor efficiency).

2. Do not use their overall score. Use their 3 independent sub scores as they are and resist to combine them. And add #MP as a forth independent score.

3. sensorgen.info converts the 3 subscores into quantum efficiency, read noise and full well capacity which may be more easily to understand and compare.

4. Differences of 15 in overall score are 1 stop. A difference of 5 is imperceptible.

5. One thing DxO misses to measure is the true dynamic range at low spatial frequencies (they are just using a scaling formula). This implies they are sometimes missing banding and uneven illumination. Something which should be taken into account as a fifth score taken from elsewhere. Other things missing are heat or readout speed.

6. Lens tests are almost impossible to interpret in a meaningful way. The lens scores suck. Use DPReview who republish DxO lens test results in a more digestible and meaningful way.
Forum: Pentax K-3 & K-3 II 11-27-2013, 05:31 PM  
How much do you trust DxO Marks' tests?
Posted By normhead
Replies: 62
Views: 9,582
My observations using both cameras would confirm that at least for the K-5 and K-3. For landscape, I may continue to carry the K-5, keeping the K-3 on a long lens for wildlife. MInd you, the K-3 is still quite a bit better than my K-x or K20D. Let's keep it in perspective. But you aren't going to pull detail out of the depths of the shadows like you could on the K-5. Proper exposure is more critical.
Forum: Pentax K-3 & K-3 II 11-26-2013, 02:54 PM  
How much do you trust DxO Marks' tests?
Posted By Rondec
Replies: 62
Views: 9,582
I think DXO Mark is very trustworthy. When they say that the D7100 has 0.3 EV more dynamic range at iso 100, I think that is exactly what they measured. However, If you look at the numbers, being able to measure a difference doesn't mean that it will end up being something you can see in the real world. For instance, the "sports iso" score for the D7100 is 1256, while the sports score for the K3 is 1216. I don't believe for an instant that you could tell the difference.

The other thing that becomes apparent looking at the dynamic range graph is that Nikon fudges their iso numbers considerably, while Pentax iso numbers are pretty accurate. At iso 6400 Nikon D7100 measures 4516, while the Pentax K3 measures 6057. It still does appear that the Nikon has a hair more DR throughout the range, but that fudging certainly gives Nikon an added edge at most stated iso points.

I don't think DXO Mark tests for banding and that is one thing the Toshiba sensor seems more prone to do than the Sony sensor, for what it is worth.
Forum: Pentax K-3 & K-3 II 11-26-2013, 02:48 PM  
How much do you trust DxO Marks' tests?
Posted By Adam
Replies: 62
Views: 9,582
Their tests don't factor in resolution, which is something you therefore have to look at on your own. For the most part, their metrics are great but they in no way to they replace field tests IMO :)

Nobody said the K-3's sensor had to be better than the D7100's- but it seems that the difference is negligible. The K-3 continues to have many advantages over the D7100, and the opposite applies as well.
Forum: Pentax SLR Lens Discussion 08-17-2013, 04:03 AM  
My Hands-on with the Sigma 18-35 f/1.8 (10 images)
Posted By Heie
Replies: 54
Views: 30,498
I stopped by the local camera store a few days ago just to poke around, and to my surprise they had the 18-35! I returned this morning with my camera bag with the hopes of being able to do a comparison (physically only, since it was a Canon mount). In no way shape or form is this meant to be a review, however for those on the fence of pre-ordering (I still haven't made the plunge but I am *VERY* seriously considering it right now), here are my first impressions:
  • AUTOFOCUS: Super quick on the Canon 700D (which the store owner let me play with, and I must say - wow...the Chinese plastic is strong with that one), although with such a short focus throw (it's 18-35mm), it isn't expected to be too slow. The DA*16-50 was only a bit slower although the 18-35 was obviously the winner. No focus accuracy issues I saw, but I only played with it for maybe 10 minutes.

  • AF/MF SWITCH: Without any question the toughest switch to activate of any lens I've ever tried. The sound is a very *sharp* click. Very sharp. I like it, and there is NEVER any chance of it accidentally being switched to MF or AF without you consciously doing so.

  • WEIGHT: This baby is heavy. Made the 700D a bit front heavy, but I think with the Pentax K-5 it would be a perfect balance. Heavier than the 16-50, although when I picked them up one in each hand, it didn't seem to be too far off. According to B&H the difference is quite a bit - 565g vs 811g, but in the hand the difference appeared much closer. Must be because I've been working out, though, huh? ;)

  • SIZE: It's not small. It is taller than the DA* 16-50 and even taller than the Sigma 8-16. Below are photos for reference. But it isn't fat, which I was expecting for an f/1.8 zoom lens. Granted "fat" is relative, but I expected it to have a bit more girth.

  • BUILD: The build quality is beautiful. Super tight tolerances and a beautiful finish. Yes it's mostly plastic and rubber, but there's nothing cheap about it, except maybe the rear lens cap (I hate Sigma's caps - the epitome of cheap).

  • ZOOM AND FOCUS RINGS: The tightest rings I've ever felt on a lens, but in no way in a bad way. Beautifully damped and again, the super tight tolerances are apparent here. Makes me think if you put a rubber o-ring on the mount it might be weather sealed. Honestly... Also, I noticed that the zoom ring "zooms" in the same direction as Pentax lenses, however the focus ring is in the opposite direction. I didn't notice it until today, but my Sigma 8-16 is the same way, so I guess it would be safe to say that you won't find that a hindrance :)

  • FRONT LENS OBJECTIVE/GLASS: It is bulbous, but not much. No where near as much as a fisheye or the Sigma 8-16, but it is far more bulbous than any standard rectilinear I've ever seen. Not an issue, but I did notice it.

  • LENS HOOD: A super tight to screw on for both regular and reversed on the lens. I liked the grip along the edge of the hood's widest part - nice touch. Still no CPL window that is standard among Pentax's lens hoods though! I also liked that it was narrower to the body when reversed, something the DA 12-24 and the DA* 16-50 could learn a lot from...

Here are photos I took. From left to right, also with their focusing windows so you can see what I meant by the direction of travel. The store owner was very nice to let me use a DA 16-45 he had on the shelf because I didn't have anything wide enough to get all of them in the same shot from so close :)

DA* 55, Sigma 8-16, Sigma 18-35, DA* 16-50, FA 77 LTD, K-30
Attachment 184233

Attachment 184224

Attachment 184225

A top down look with the Sigma 8-16 to show its size when mounted. I lined up the Sigma 8-16 and its cap to mimick the exact placement of when mounted as well.
Attachment 184234

Each of these are different shots, all at f/1.8 with their 100% crops included, no sharpening applied - the only processing was RAW into Lightroom with slight exposure fixes - nothing more. Canon 700D. Keep in mind that glare also is a bit of an issue with reducing sharpness because they are through glass windows with a lot of overhead store lights. Also there is a bit of noise because I didn't get a chance to change the ISO. I had a hard enough time changing settings. I settled for Av mode and RAW (which was another pain to try to change - whomever claims Canon's menus are superior to Pentax's is out of their damn minds).
Focus about 2.5m away
18mm
Attachment 184228

35mm
Attachment 184227

Focus about 10m away
18mm
Attachment 184229

35mm
Attachment 184230

Close focus, about .5m away.
Attachment 184231

Super shallow DOF at close distance.
Attachment 184232

My biggest gripe - I would have preferred if they made it 16-30 f/1.8, but that won't change the fact I will most likely get it sometime around Christmas time after seeing some comparisons against the FA 31 and maybe even the Sigma 30 f/1.4 ART (not the old version) should Sigma decide to release it for Pentax. If the lens were weather sealed, though, I'd have one on pre-order to replace the DA* 16-50.

Like I said - this is *not* a review at all, just a hands on for a lens that most haven't seen in person yet. With that in mind, I hope this was beneficial to you :)

-Heie
Forum: Pentax SLR Lens Discussion 08-12-2013, 12:13 AM  
Deciding between Sigma 17-50/f2.8 and 17-70/f2.8-4.0 Contemporary
Posted By norArn
Replies: 13
Views: 26,877
Just for the records: googling the issue with shorter max focal length than expected gained me the knowledge that zoom lenses (most of them) tend to become shorter (in focal length) the more narrow you focus: this is due to design issues. Primes do not in general have this behavior. So, zoom lenses in general have the stated focal length (+/- 5%) only when focussed at infinite. And here the Sigma 17-50/f2.8 seems to fit well (just a tiny more wide than the FA50/f1.4 at infinite). I'm quite happy with these findings. :D
b.r. Arne
Forum: Post Your Photos! 07-01-2013, 06:40 PM  
Cityscape SuperMoon
Posted By VisualDarkness
Replies: 1
Views: 1,033
Nice cityscape! The tone somehow reminds me of a rainbow.
Forum: Pentax K-5 & K-5 II 06-24-2013, 07:19 AM  
Supermoon
Posted By mepaca
Replies: 14
Views: 2,792
Supermoon over Chesapeake Bay
shot with K-5 and da 55-300
Forum: Pentax SLR Lens Discussion 06-21-2013, 04:12 PM  
Some DA* 50-135 Love
Posted By Driline
Replies: 55
Views: 9,846
I really like that Miami shot Gomez. Wow! Now only if I could make that lens sing like you do.
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