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Forum: Pentax SLR Lens Discussion 12-15-2017, 02:14 AM  
What lens has the most clinical color?
Posted By Alex645
Replies: 45
Views: 2,975
For your Pentax K-S2, I'd suggest the Sigma 35mm f/1.4 DG HSM Art or from your own kit, the Pentax 40mm f/2.8 XS pancake.

But there are many factors that affect color balance even if you're shooting RAW. And RAW images from a Canon CMOS will have a different color balance bias than one on a Sony or Toshiba or Samsung CMOS, Kodak CCD, or Sigma Foveon, etc.

If you knew the exact color temperature of your light source, you could set your WB to custom match it. But because of human color perception, unless you have an image with 18% grey and skin tone, your brain will alter your perception of the skin tone. A green background will make skin tone look more magenta, while a red background will make skin tone more cyan, etc.

Then you go down the rabbit hole of color print profiles and monitor calibration. In your printer settings, are you setting it to "perceptual", "relative colormetric", or "absolute colormetric"?

In my experience, Zeiss and Sigma Art lenses are amongst the most "clinical", but because most human subjects look better warmer, the truly neutral more 'clinical' lenses have a rendering that is relatively colder/cooler.

If you want to compare your own lenses, I'd suggest shooting RAW with a full spectrum light source and manual WB to match. Shoot a grey scale image. That may be the easiest way to see which white/grey/blacks are warmer, which are cooler, and which is the most neutral.
Forum: Pentax SLR Lens Discussion 11-06-2017, 02:51 PM  
Full-frame lens on a crop body not advisable?
Posted By stevebrot
Replies: 168
Views: 9,583
This is often claimed, but without source citation. It ignores the fact that the "medium" has traditionally been poorly defined during the so-called "film era" and the lens makers were well aware that reviews would be based at least in part on optical bench evaluation with no film being used. Simply put, they designed and built to the best manufacturing, design, and materials standards available at the time.

Available evidence suggests that the better film-era lenses were media-limited on all but the best emulsions of the day and perform appropriate to available resolution of digital sensors now. A good example might be the FA 31/1.8. The highest resolution pictoral film available when it was made was Kodak Technical Pan with a manufacturer's MTF50 of 100 l/mm. That lens was tested by photozonede at 165 l/mm on the K-5, a pretty decent performance. The D-FA 55/2.8 Macro tested at 170 l/mm on the K-5II camera. I'd say those results were within spitting distance.

So-called digital design can have different meaning depending on system. For mirrorless systems it means correcting for poor oblique light capture at the margins of the frame along with appropriate anti-reflective coatings. There are many legacy wide-angle rangefinder lenses (also short registration) that perform poorly on cameras such as the Sony A7 series as a result of the quirks of digital capture. Fortunately, dSLRs generally feature a generous registration distance with much less concern about rear element size and on-axis angles. As for coatings, the proof of that pudding would be in the eating. Most film emulsions are somewhat less reflective on the emulsion side than the surface of a digital sensor and the potential does exist for decreased contrast as a result. I have a few older (pre-1970) lenses for which this is a problem, but no particular issues with MC optics made since then.




Steve
Forum: Pentax SLR Lens Discussion 11-07-2017, 11:03 AM  
FA 35mm 2.0 or DA 35mm 2.8 limited
Posted By Madaboutpix
Replies: 26
Views: 2,490
Based on your own statements about your likes and expectations, you should probably go for the FA35 F2, since it really seems to be the brighter and not necessarily macro lens that you want. Kind of a no-brainer, I guess.

Personally, I haven't used the FA, but if it shares what I understand to be the rendering characteristics of its series, I would expect slightly warmer colours and a tad less contrast than I see in my smc DA35 F2.8 Macro. I happen to like the Limited's snappy rendering a lot, but, by all accounts, the FA35 is a more than solid performer which has plenty of character itself.

For the premium you pay for the Limited, it should be noted, you do get a much nicer build quality and that close-focusing ability. I've also found my copy to be quite usable already wide open at F2.8, with sharpness peaking at around F5 or F5.6, and nicely holding up till about F8 or, allowing for a wee bit of diffraction, F11.
Forum: Pentax SLR Lens Discussion 11-05-2017, 08:58 AM  
Full-frame lens on a crop body not advisable?
Posted By lytrytyr
Replies: 168
Views: 9,583
Very misleading: f/2.8 remains f/2.8 in terms of exposure.
Forum: Pentax SLR Lens Discussion 07-18-2017, 01:44 AM  
Which 35mm lens? (DA 35/2.4, FA 35/2, DA 35/2.8 Macro)
Posted By Madaboutpix
Replies: 49
Views: 5,268
Have owned the smc Pentax-DA 35mm F2.8 Macro Limited since 2012 and shot it on K-7 and K-3 bodies. Don't use it as much as my other lenses (except the 18-55mm kit zoom, which has largely fallen out of use with me), but that's due to the standard focal length more than anything else.

Whenever I do use this little gem, I return consistently pleased with its beautifully defined rendering. With its short working distance in macro, it may not be the answer to all my macro wishes, but I have always viewed it as a standard prime that lets me get really close to my subject if need be. With the smc version, you even get the lovely starbursts familiar from the smc DA15 and 21 Limiteds.

Since I've had it in my kit, I've never experienced any serious gear lust for any other 35 on the market, Pentax-branded or third-party. The DA35 Limited is that good.
Forum: Pentax SLR Lens Discussion 07-17-2017, 01:43 AM  
Which 35mm lens? (DA 35/2.4, FA 35/2, DA 35/2.8 Macro)
Posted By davidsladek
Replies: 49
Views: 5,268
I have both the FA35 and DA35. Having used them on a K-1 in FF mode the DA seemed to be inconsistent in exposures and focusing, might just be my copy. I love the FA though it is softer at 2.0... I mostly use it from 3.2 upwards, but have done a couple of events on 2.0 and 2.8 and with some careful sharpening the results are pretty good (even great on screen size images). The colour rendering and pop effect are great and the bokeh seems lovely. But take this as an experience from a street photographer who doesn't really focus on image quality as on the image content. Focusing is pretty fast on the FA, I have to say.
To cut long story short, I stopped using the DA after purchasing the FA.
I did test Sigma 35/1.4 in the shop but wasn't impressed with the focusing variability... it wasn't microadjusted and I might have been put off by the narrow field of view but I decided to wait for the new Pentax offering...
Forum: Pentax SLR Lens Discussion 06-22-2017, 05:52 AM  
best pixel peeper lens
Posted By TER-OR
Replies: 42
Views: 4,358
I always try to urge people to remember that long shots are rarely going to be tack sharp. Our eyes and brains are good at ignoring things the camera will record - like haze, wind effects, heat effects etc. I'll often get a shot of an aircraft obviously in focus but sadly soft, then remember the plane was likely a half-mile away - or more.

JPEG processing and in-camera sharpening of images is another warning.

I have zero complaints about sharpness with my K3II and FA100 f2.8 macro. Zero. Performance of my 55-300 at distance - well, it's a budget-friendly lens...
Forum: Pentax SLR Lens Discussion 06-19-2017, 02:51 PM  
best pixel peeper lens
Posted By BigMackCam
Replies: 42
Views: 4,358
I can't comment on the 43 specifically as I don't own it. But I will say this... *please* don't become obsessed with sharpness if you're not already. I'm not saying it's an entirely-unimportant factor, but overall rendering characteristics are, IMHO, much more significant. Some of my favourite lenses don't have the best resolution figures, and some of my sharpest lenses aren't necessarily the best when it comes to an overall look and feel of the images they produce.

I've seen some truly beautiful images others have produced with the FA43. Without even knowing its resolution measurements, I wouldn't hesitate to buy it if the focal length applied to my needs at the time.

Interestingly, I was at a large photography show here in the UK some months back, and I was talking to one of the guys on the Ricoh / Pentax stand. He said that, since the release of the K-1, they are selling more FA43 lenses than they had ever expected...
Forum: Pentax SLR Lens Discussion 05-19-2017, 11:47 AM  
K-1 + DFA 28-105 mirror slap / shutter shock etc
Posted By Adam
Replies: 20
Views: 3,035
It's not really the SR's fault- on the K-1, shutter vibrations can introduce softness, especially around 1/90s, 1/125s, and 1/180s. There are other threads on this topic if you'd like more info, and also, based on my experience, some cameras have it worse than others- there seems to be some variation/tolerance in the shutter performance.

To address this, the electronic front curtain shutter option was added.
Forum: Pentax SLR Lens Discussion 04-29-2017, 04:36 AM  
Pentax 20-40mm f2.8-4
Posted By acoufap
Replies: 17
Views: 2,100
Such a compact FF lens would be possible - not f2.8 but f4. The only a bit slower SMC Pentax-FA 20-35mm F4 AL (245g, Filter Size 58mm) proves it. With DC or PLM motor and a slightly wider image circle and filter thread of ~62-67mm to get less vignetting and improve other IQ attributes it would surely be heavier. But even with 450g it would be a really great offer with less than half weight of the 15-30 and I guess a lot of people would be interested. I hope for a FF compatible 20-40 Ltd. (mkII) - but fear I'll wait forever. ;-) ... if we don't get this I hope for a DFA20.
Forum: Pentax DSLR Discussion 04-02-2017, 01:51 PM  
Pentax, autofocus and the future
Posted By Ian Stuart Forsyth
Replies: 287
Views: 25,405
Let me correct your statement above "My AF works just great for my expectations with inexpensive lenses."

People have very different expectations with there equipment

If you are happy with this then that's okay

I would at least expect to have the focus plane near the front of the target



Especially given that you had the time to pre focus the camera prior to capturing the image

---------- Post added 04-02-2017 at 02:06 PM ----------



And people that don't look for better than average photographs are always quick to display




I for one an always looking for ways to take better photography









I am not in the least interested in taking images like yours ;)

Birds In Flight are not that difficult for a cameras AF unless they are erratic like swallows most birds fly at very consistent speeds



---------- Post added 04-02-2017 at 02:13 PM ----------



Here is my post Please point to the area where I said anything about AF speed



Better AF was the sum of my post and you interject AF speed into that, so maybe your not at 97% as you think ;) seeing as how you derived AF speed from 5 lines that refer to better AF with no mention of AF speed
Forum: Pentax DSLR Discussion 03-16-2017, 07:26 PM  
Pentax, autofocus and the future
Posted By rawr
Replies: 287
Views: 25,405
Oh look, another Pentax AF thread ... :rolleyes:


As an owner of two Nikon DSLR's, I don't understand all this mythologizing of Nikon's AF. Depending on the lens, the light, the subject, Nikon AF can perform better, or worse, or the same as Pentax AF.

Plus I'm sure Ricoh's engineers are as clever as Nikon's (probably went to the same universities). If it was a management priority, and the resources flowed, Ricoh could probably blow Nikon's AF right out of the water.


Performance there can depend on your AF settings. If you shoot with centre-point AF, for example, you can't rely on the other surrounding AF points to assist you with depth information needed for predictive tracking. Similarly, if your metering has been set to spot with a K-3, you can't rely on the 86k RGB metering sensor to feed colour movement information as an input into your AF tracking algorithm either. Same problems are evident in Nikon '3D tracking' or Canon's 'AI Servo AF'. Predictive motion tracking is hard, and relies on multiple camera inputs to help make it work.


Indeed. Even Nikon D500 shooters will get poor results if they don't do the basics.

Study a Canon 1DX (and newer) auto-focus settings guide or white paper. The K-3/K-3II/K-1 options and concepts will look familiar.

Not that Pentax AF is perfect. Their technology certainly needs to keep evolving, and it would be nice indeed if Ricoh could more aggressively apply their corporate resources to make Pentax AF work a lot better.
Forum: Pentax DSLR Discussion 03-21-2017, 06:15 AM  
Pentax AF is Great
Posted By tromboads
Replies: 75
Views: 6,466
Ah this ain't no fun.

Lets just all agree, that the myth of AF-C being unusable is rubbish. It's plenty darn usable. And then we can all get along taking photos like this guy.



See he's having fun.

---------- Post added 03-21-17 at 11:25 PM ----------

Speaking of fun



Porsche driving is not fun. It's serious business when one is not sleeping. :P How calm does this guy look. This is the exist from the down hill right turn before the banked rleft on to the start line. His foot would have been buried here yet no smiles or childish laughter. I'm unsure If I would ever stop laughing being on full noise in a 911.

Oh and yeah. Penatx AF-C is fine.
Forum: Pentax SLR Lens Discussion 02-01-2017, 02:13 PM  
Good, inexpensive ND filters
Posted By BigMackCam
Replies: 34
Views: 4,422
That depends on your expectations, Lowell. The purpose of the thread wasn't to compare these cheap filters to high-end, high-performance models. Rather, it was to let people know that I'm getting results from them that are well beyond my expectations based on what I paid, and considerably better than cheap filters I've used in the past.

These cheap filters will undoubtedly have limitations, and I'm confident you could expect better performance from much-more-expensive, high end filters (both points mentioned in my original post). But for the use cases I've tried so far - involving daylight shooting where the intention is to allow a slow shutter speed and/or fast aperture - they're working very well with no discernible image quality degradation. On that basis alone, I happily declare them "good for the price paid".
Forum: Pentax SLR Lens Discussion 03-07-2017, 09:52 PM  
What Focal Length for the Total Solar Eclipse?
Posted By AstroDave
Replies: 16
Views: 2,437
No - that is the factor of a million I am talking about. Unless you have a camera with that dynamic range, or are willing to sacrifice your camera sensor by way over exposing the sun, you can not see ANYTHING on the moon until totality.
Forum: Pentax News and Rumors 01-26-2017, 02:29 PM  
Pentax KP - Specifications
Posted By Doundounba
Replies: 666
Views: 82,457
That might very well be, but the competition is moving too... If you compare the KP to the XT-20 - both one step below top-level, though presumably so in the case of the Pentax - the value proposition is very different than it was when I bought my K-3, and it was K-3 vrs XT-1. At that time, the K-3 clearly outgunned the XT-1 for waaaay less money, in my opinion. Now, some years later, KP vrs XT-20 isn't so clear anymore. They're both 24MP now, but fairly different cams. There's WR and IBIS on the Pentax side, but on the other side there's 4k, touchscreen, faster bursts with deeper buffer, a much lighter body, possibly better AF and arguably nicer JPG engine for the Fuji. Fuji is also coming out with some nice reasonably inexpensive primes which address the issue of expensive lenses. And the KP is launching $200 above the XT-20. Some people dislike x-trans, and EVF vrs OVF can be a religious issue, but my point is the comparison isn't the same kind of ass-whuppin' that the K-3 dealt to the XT-1, value-wise, when I went with the K-3... On the other hand, Pentax bodies tend to go down in price much more than Fuji bodies, so maybe in six months the equation will be very different. For myself, I think I'll try to soldier on with the K-3 for now. Still one heck of a nice camera. :)
Forum: Pentax News and Rumors 01-26-2017, 10:11 AM  
Pentax KP - Specifications
Posted By Mistral75
Replies: 666
Views: 82,457
4. 1/6,000s mechanical shutter
5. max 7fps burst mode
6. minuscule buffer
7. only one SD card slot
8. smaller D-LI90 battery.

The reasons for the price increase have been explained by monochrome. They will apply to all future cameras as well, unfortunately, including the next APS-C flagship.

K200D had a dedicated battery grip (D-BG3) whilst not being a flagship.
Forum: Pentax News and Rumors 01-25-2017, 09:38 AM  
Pentax KP - Specifications
Posted By photoptimist
Replies: 666
Views: 82,457
I would suspect it's watts, not dollars that limits the amount of buffer. The bigger the buffer, the greater the power draw on the battery.


And given Ricoh's decision to have user-swappable hand grips and a smaller battery, a bigger buffer may have put too much stress on that smaller battery.
Forum: Pentax News and Rumors 05-20-2016, 11:52 AM  
Sigma 85mm F1.4 discontinued
Posted By HopelessTogger
Replies: 202
Views: 23,368
Truth is, f/1.4 is pretty useless on modern full frame digital. The DoF is so, soooo thin and modern sensors so much better at high ISO performance and noise reduction software advanced, that ultra fast lenses are fairly pointless. They're large, heavy and expensive and in all but a few examples they're quite soft wide open (ironically Sigma Art is generally the exception for wide open sharpness).

I have a K 1.2/50 and the Planar 1.4/85 and I never shoot them wide open anyway, nearly always stopped down to at least f/2. I find slightly slower, much smaller, lighter lenses like the 1.8/77 Ltd to be ideal (although stopped down the Planar is stunning).

I'd sooner the manufacturers produced slightly slower (f/1.8 - f/2) genuine apochromatic lenses.
Forum: Flashes, Lighting, and Studio 12-30-2016, 07:07 AM  
The Reason Why Third Party Stobe Manfactures Don't Supports P-TTL
Posted By mcgregni
Replies: 40
Views: 2,705
I find those points understandable, if that is the equipment and working technical approach you want. Regarding HSS, I am a strong proponent of automatic control for HSS exposures, but then I am using it mainly in fairly dynamic environments, plus a lot of on-camera stuff, so P-TTL with my Pentax flashes is great for that .....

Now for controlled, outdoor modelling shoots, well that is really quite different, and I think many here would question the need, or even desirability, of TTL for a multi-strobe set up for that situation. In fact I'm sure that even with HSS many would advocate full manual control. I do wonder if the need for TTL with the strobes as you say you need is really worth the cost of a total system change in order to get it, when the alternative manual options with Pentax could still do the job well. ....
Forum: Flashes, Lighting, and Studio 12-30-2016, 03:06 AM  
The Reason Why Third Party Stobe Manfactures Don't Supports P-TTL
Posted By Class A
Replies: 40
Views: 2,705
Interesting.

What were your issues with CLS?

What did Nikon replace CLS with for the D5/D500?

N.B.: I personally prefer full manual control, but I realise that not everyone thinks like that and hence believe there is a need for Pentax to come up with a better multi-light control system that features some level of automation support.
Forum: Flashes, Lighting, and Studio 12-29-2016, 10:12 PM  
The Reason Why Third Party Stobe Manfactures Don't Supports P-TTL
Posted By UncleVanya
Replies: 40
Views: 2,705
This may help shape your choices... HSS is unlikely to be needed if you use an ND filter as I understand it.
















You Tube



Forum: Pentax SLR Lens Discussion 12-29-2016, 02:21 PM  
Deciding on new Primary Lens [Pentax 16-85 vs Sigma 17-50 vs Tamron 17-50]
Posted By BigMackCam
Replies: 38
Views: 6,492
That's an interesting observation - and one I can relate to, though I'm not certain we mean the same thing. I really like the Sigma 17-50 f/2.8 and still believe it was - by far - the best choice for what I wanted. I have plenty of photos taken with it that I'm happy with after post-processing, but... I dunno, straight out of the camera they feel a bit lacking in character. In my case, it could be that I've developed a liking for older and essentially "flawed" lenses. The Sigma is a fairly consistent performer at all focal lengths - sharp in the center, perfectly decent at the borders wide open, and better still stopped down - and the bokeh is quite pleasing for a normal zoom. Compared to a few of the lenses I like shooting with most, the Sigma is technically a "better" lens...
Forum: Pentax SLR Lens Discussion 12-08-2016, 02:01 AM  
Better camera (K-3) needs better glass?
Posted By Alex645
Replies: 33
Views: 2,563
There are so many parameters such as lighting, contrast, aperture, etc, that will show you more or less differences between the two sensors. As you wrote, the ultimate answer will come from your own testing and subjective tolerances. But I believe you will start seeing a separation of quality between the digital primes, film primes, digital zooms, and then film zooms...in that order of diminishing returns.

I think most of us are very guilty of overly objectifying technical perfection. For me, there is a happy balance between lens quality (sharpness, color, vignetting, distortion, chromatic aberration) and lens character (flaws). I surprised myself when shooting with some superb Zeiss primes. Optically close to flawless but also, dare I say, boring? And of course the sharpness I may want for a macro portrait of a gecko would not be the same qualities Iʻd prefer in portraits of people.
Forum: Pentax SLR Lens Discussion 10-31-2016, 04:08 PM  
Looking for an ultra wide angle for FF..
Posted By Scorpio71GR
Replies: 28
Views: 2,285
If you can find one there is the Sigma 12-24 which is a full frame lens. I'm sure it is smaller than the 15-30.

Sigma 12-24mm F4.5-5.6 EX DG Aspherical Lens Reviews - Sigma Lenses - Pentax Lens Review Database
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