Forgot Password
Pentax Camera Forums Home
 

Showing results 1 to 25 of 300 Search:
Forum: Photo Critique 5 Days Ago  
Landscape To Crop or not to Crop?
Posted By CarlJF
Replies: 6
Views: 285
Croping works fine. But it's also a different picture than the original framing... The question is then more what you, as the photographer, wanted to show with this picture ?

As for the uncropped version, have you try to adjust the contrast, exposure and curves to make the sunrays more obvious, as suggested by Wasp ? It could look pretty good, but difficult to say without tryint it. Processing in B&W could even allow a bit more pushing in contrast, again giving you a completely different picture and feeling. It's certainly worth a try...

To make a long story short, there might more to do with this picture than just cropping it...
Forum: Pentax DSLR Discussion 6 Days Ago  
New to photography. Help me choose a pentax.
Posted By CarlJF
Replies: 58
Views: 1,213
What "newer" exactly means here is KAF4 mount lenses. Actually, the're only two: the DFA 50 1.4 (which you probably won't be interested in) and the DA 55-300 PLM (which might interest you in the future if you ever feel the need for a telephoto zoom). We don't know how many nor the proportion of KAF4 lenses that could be launched by Pentax in the future. But it's probably better to be future-proof and get a body supporting KAF4 lenses than saving a few bucks on one limited to KAF3...
Forum: Pentax DSLR Discussion 6 Days Ago  
New to photography. Help me choose a pentax.
Posted By CarlJF
Replies: 58
Views: 1,213
From these, I would recommend to go with either the K-3 or the K-S2. The two older K-5 aren't compatible with some of the newer lenses, making them difficult to recommend.

If you're an absolute beginner in photogrpahy, the K-S2 might be a better choice than a K-3. Mainly because it's simpler to use and will give you the possibility to fall back to the easy "scene modes" when you just want to take the shot without having to care much about the settings. The K-3 really is targeted at expert users supposed to know what they're doing and doesn't need any hand holding. The number of features and functions on the K-3 can be overwhelming for a beginner.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 10-05-2018, 11:59 AM  
Fuji mirrorless cameras...why change systems
Posted By CarlJF
Replies: 33
Views: 995
Marketing ?
Forum: Pentax Q 10-05-2018, 06:44 AM  
What processing software do you use with your Pentax Q series?
Posted By CarlJF
Replies: 18
Views: 764
Same for me. LR + Denoise and Clarity do wonder with the Q7 file.

Now, for the OP, if the DXO lab doesn't support the RAW file, you could still use another software compatible with it (PDCU, Rawtherapee...), save the file in TIF 16-bits and work with it in DXO Lab. OK, it's not exactly like working directly on the RAW but probably is the nearest thing.
Forum: Flashes, Lighting, and Studio 10-05-2018, 06:33 AM  
Help with first flash
Posted By CarlJF
Replies: 9
Views: 383
This^^^

That said, for a do-it-all flash, I would highly recommend a P-TTL flash with a head that could tilt and swilvel, the most powerful your budget would allow.


Manual flash are cheaper, but if it's your only flash, sooner or later you will be in a situation for which you would like to have some P-TTL features. Most P-TTL flashes also can be used in manual mode, so it's the best of both world.

A swivel head really is a must and is essential for on-camera bounce flash. Bounce flash certainly is something you probably will want to experiment, but isn't as convenient to do with a non-swivel head (and also will work much better in P-TTL than in manual).

For power, a flash cannot be too powerful. It's always possible to use a lower power setting on a flash, but there isn't much to do if the flash lacks power. I would not recommend anything with a GN less than 36.

As for specific brand or model, I have experience with Pentax and Metz flashes and both are very good and recommendable. This doesn't mean that other brands aren't good, just that I doesn't know them and thus can't really recommend them either... I would not frown upon trying a cheaper, lesser klnown brand as a long as it meets the criteria detailed above (P-TTL, swivel head, power). And the difference in price should be significative compared with Pentax or Metz with the same feature set and power.
Forum: Photographic Technique 10-01-2018, 06:14 AM  
Focus Shift and a Possible Workaround.
Posted By CarlJF
Replies: 21
Views: 640
Lets not forget that we work with photography equipment, not some kind of high precision astronomical or scientific devices. So, yes, there is some variation and they are normal and expected. Although there can be focus shift when closing the aperture, in practice this doesn't matter for photography. Because the increase in DOF will more than cancel any slight shift the focus may have (unless the lens is defective, which is totally different matter). So, basically, just enter the adjustment for the widest aperture and don't overthink or overwork it, unless doing it as some kind of scientific experiment. It should work good enough for more than 99% of photography needs.


If you need extremely accurate focusing, the best is still to work in manual focus. No matter how far you go in defining precise adjustment, autofocus will still be less accurate for fundamental reasons.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 09-28-2018, 10:41 AM  
Micro Four Thirds and Panasonic FF
Posted By CarlJF
Replies: 27
Views: 897
They will not quit m43, but will certainly put more resources on developing their FF line.



m43 is in a really bad position. It's squeezed from the low end by smartphones for people wanting "small but good enough" and on the other end by mirrorless APS-C (like the EOS-M line, Sony A6xxx...), which are about the same size but offer better sensors for those who want "better than smartphone but not to bulky". Notwithanstanding the fact that some of the latest m43 are now just as large as DSLR! Between these two, the niche for m43 is getting tighter with each new generation of smartphone and mirrorless APS-C.The question is then, for how long will this niche will continue to have enough customers to justify developing the m43 format ? Supposing it didn't already have crossed that line.
Forum: Pentax Price Watch 09-26-2018, 02:02 PM  
Corel Photo and Video Software for 29.99 on Groupon
Posted By CarlJF
Replies: 11
Views: 641
I concluded the same when I tested it.
Forum: Photographic Industry and Professionals 09-25-2018, 07:34 AM  
Photokina 2018 Q&A - What would you ask Ricoh?
Posted By CarlJF
Replies: 307
Views: 10,928
As with anything Pentax right now, 2019 or later...
Forum: Pentax News and Rumors 09-24-2018, 07:31 AM  
Photokina, Ricoh has Confirmed
Posted By CarlJF
Replies: 1,960
Views: 101,624
Well, even on a DSLR, CDAF in Liveview is often the only way to make the Tamron 17-50 focus properly... ;) Let's say the Tamron hasn't the most reliable or predictable autofocus, to say the least. Some copy can really drive you mad...
Forum: General Photography 09-21-2018, 09:55 AM  
Autofocus Accuracy across brands - any data?
Posted By CarlJF
Replies: 5
Views: 493
Exactly. And the fact that on sensor focus still has a lot of things that could be improve or developed in a very competitive field while PDAF on DSLR is a very mature technology without as much competition. Now that Canon and Nikon are fully in the mirrorless game, I suppose they will put much more effort to compete in this technology rather than investing in PDAF where only minor iterations are possible. But I may be wrong...
Forum: General Photography 09-21-2018, 09:33 AM  
Autofocus Accuracy across brands - any data?
Posted By CarlJF
Replies: 5
Views: 493
The article is old, but the conclusion remains valid: it depends on bodies and lenses used...

Now, although the trend is to go toward large aperture lens, the trend is also to move toward mirrorless cameras. Since they work with contrast focus, they're not limited by the aperture in their precision and accuracy. Their phase detection part is only there to provide a speedier focusing and better tracking, since PDAF has the advantage of providing information on distance. So, it's now more like an hybrid system where PDAF helps going rapidly near the point of focus while CDAF helps nailing it perfectly once near that point.

So, no, now that all the major players move toward mirroless I don't think we'll see much more than what we already have in PDAF technology. The efforts will rather be put on improving on sensor focusing. And, by definition, any issue related to mirror or submirror aren't relevant in a mirrorless camera. Or, said otherwise, on ML edge focusing is basically just as good as the center.
Forum: Pentax K-1 09-21-2018, 09:16 AM  
Repeatability of image in focus using non-central focusing points on K-1
Posted By CarlJF
Replies: 14
Views: 595
Well, have you really read my explanation:

So, your 5.6 lens works just fine with the central focus point. But they do not take advantage of the higher precision offered by these points.



This says exactly the same thing as I explained above, but in three pages instead of a few sentences. The goal here wasn'.t to explain in depth all the technical intrecacies of a modern PDAF system. It was rather to explain in a concise an simple way that focusing points aren't all equals by design. Some are 2.8, some are 5.6, and some are f8 (although not on Pentax bodies). The f2.8 ones are more accurate by design and it's normal and expected that the OP get more shots in focus with these f2.8 points than the 5.6 ones.



Yes it is. There are plenty of articles on the web and a few thread on PF discussing this topic in depth, if people want to know how it works under the hood. But for this specific thread, there's no need for the OP to go to know more than there are 2.8 points and 5.6 points and that 2.8 are more precise and accurate than 5.6 when using a large aperture lens.
Forum: Troubleshooting and Beginner Help 09-21-2018, 08:08 AM  
Pentax KP and Pentax 360F GZ II flash
Posted By CarlJF
Replies: 1
Views: 297
Be sure the camera in AF.S. Assist light doesn't work in AF.C...I don't have a KP, but this has been the case with my other Pentax cameras...
Forum: Pentax K-1 09-21-2018, 07:12 AM  
Repeatability of image in focus using non-central focusing points on K-1
Posted By CarlJF
Replies: 14
Views: 595
Light level has nothing to do with it. The points all have the same sensitivity to light, they're all rated at -3 EV. The diiference is simply because the 2.8 points are more precise than the 5.6 ones.

To make it simple, the way a phase detect autofocus system work is by splitting the image in two slits. When the two images are the same (in phase), it means the image is in focus. If the image in one slit is blurry relative to the other it means the focus is too far or too near. Now, the farther the slits are separated, the more accurate the system is. In a 2.8 point, the slit are a distance calibrated to give proper focus based on an aperture of 2.8. In a 5.6 point, the slits are nearer and calibrated for an aperture of 5.6. Why then not all points are calibrated for 2.8 ? It's because the larger distance between teh slits require a larger aperture to cover both. Thus, in a 2.8 point, you need at least a lens with an aperture of 2.8 to cover both slits. Since many lenses aren't 2.8 or larger, this would mean the AF system would not work with many lenses. Thus 5.6 is kind of the lowest common denominator since it probably covers 99% of lenses. The center points also have both pair of slits: 2.8 and 5.6. So, if a lens slower than 2.8 is used, they still work but fall back to the regular 5.6 slits and are then no better than any other points. On the other hand, if a lens with an aperture of 2.8 or larger is used, the center points will use their 2.8 slits to give more precise and accurate focus. And this is exactly what you observe with your 1.4 lens: the center 2.8 AF points gives you more precise and accurate focus than the other 5.6 ones. This is to be expected and what the 2.8 points have been designed to do.
Forum: Pentax K-1 09-21-2018, 06:36 AM  
Repeatability of image in focus using non-central focusing points on K-1
Posted By CarlJF
Replies: 14
Views: 595
It's certainly written somewhere in the K-1 manual. I don't have a K-1, thus I can't give you the exact page number but here's a quote from the K-1 review on PF, p. 18:

As on the K-3, the center point and the two points directly above/below it are able to take better advantage of faster lenses (up to F2.8).

The default for all other points is f5.6. True not only for Pentax but for Canon and Nikon as well, focus points are f5.6 unless specified otherwise. There's even f8 points on some camera, not very accurate but still working with slow lens with TC.

They have the same sensitivity in terms of light level, but they don't have the same accuracy. The f5.6 points will be in focus according to the DOF the image will have a 5.6. If you use 1.4, it means the focus might be off because the DOF is much thinner, but the focus would have been somewhere in the plane of focus at 5.6... The same is true for the 2.8 points. They're significantly more accurate than the 5.6 ones, but might not be 100% accurate when using a 1.4 aperture.

So, what you experienced is a fundamental limitation of the PDAF system as implemented today in DSLR. This is where CDAF, in Liveview, or manual focus (particularly in LV with focus peaking) will give you better results since they will work based on the DOF of the final picture.
Forum: Pentax K-1 09-21-2018, 05:52 AM  
Repeatability of image in focus using non-central focusing points on K-1
Posted By CarlJF
Replies: 14
Views: 595
For one thing, only the central points are f2.8. All the others are f5.6 points. They're OK for general shooting but expecting them to give accurate and reproducible results with a f1.4 lens is a stretch... The're certainly not the best way to get accurate focus in thin DOF situation with a large aperture lens. So, there's nothing wrong with your results. If you close down to f5.6, the rated aperture of non central focus points, I'm pretty sure everything will be sharp.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 09-20-2018, 11:14 AM  
K-3ii to D500... Is this the right move?
Posted By CarlJF
Replies: 257
Views: 5,847
It's probably the best move right now. If you can find a used one at a fair price, it means you could try it as much as you want and resell it without losing much money, if any, if it doesn't work for you. At worst, you will have lost a few weeks but at least will have the certitude that this setup doesn't work for you. At best, it works good enough for you and will have save a lot on money!
Forum: Pentax Price Watch 09-19-2018, 12:43 PM  
Corel Photo and Video Software for 29.99 on Groupon
Posted By CarlJF
Replies: 11
Views: 641
BTW, you can try Aftershot free for 30 days. Probably worth trying before spending even 20$ on it. I gave it a try a few months ago and had been underwhelwed by it. Its RAW processing was definetely subpar to LR (and probably most other software). I never was able to get a picture looking near as good as LR. No matter how much time I put on it. In fact, even an SOOC jpg was better than AS3...

But nothing to lose by trying it and decide for yourself...
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 09-19-2018, 06:35 AM  
K-3ii to D500... Is this the right move?
Posted By CarlJF
Replies: 257
Views: 5,847
Out of curiosity, and also because it could be of interest to the OP, how much would you say is teh difference ? Is it something like 1/10 with the Pentax while 10/10 with the D500 combo ? Or is it more like 4/10 with the K3 compared to 7/10 with the Nikon ? Said other wise, is it the difference between no pictures and a lot of them, or does it rather means a some more pictures with the D500 but still many keepers with K-3 ?
Forum: Photographic Technique 09-18-2018, 09:39 AM  
Exposing for the highlights
Posted By CarlJF
Replies: 23
Views: 991
I would just use matric metering and set exposure compensation at something like -2 and use Av, Tv or TAv mode. If there's no sky in the frame, just set it back to 0. The most convenient is to use Av and set one wheel to control the aperture and the other one to set exposure compensation. It makes it very quick to control the depth of field and correct the compensation if needed

With a bit of practice, you will be able to judge when you need to apply EC and by how much.
Forum: Pentax News and Rumors 09-18-2018, 07:31 AM  
K3ii replacement
Posted By CarlJF
Replies: 2,057
Views: 129,060
But the problem is that there's no 400mm f4 in m43 mount... Now, if you want to discuss that you could do things with gear that doesn't exist, it's your choice but it's rather pointless. As is changing your actual gear for imaginary ones...
Forum: Post Your Photos! 09-17-2018, 06:29 PM  
Macro Araneus diadematus
Posted By CarlJF
Replies: 8
Views: 168
Thank you all guys for your comments!
Forum: Pentax News and Rumors 09-17-2018, 09:57 AM  
Wild rumour: Samsung to provide APS-C sensors to Ricoh Imaging (and Fujifilm)
Posted By CarlJF
Replies: 150
Views: 8,374
Well, if we had any certainty, official statement by RP, or specific knowledge about any of this it would not be a rumor thread anymore...
Search took 0.02 seconds | Showing results 1 to 25 of 300

 
Forum Jump


All times are GMT -7. The time now is 12:47 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top