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Forum: Pentax K-5 01-26-2011, 04:47 PM  
Relevant news re malfunctioning AF under artificial light
Posted By lock2nl
Replies: 752
Views: 106,119
I can hardly call the assist light a solution. It is a workaround at some occasions. Nothing else.
The fact that some new Pentax K5 cameras really do seem to have a good AF tells me they do not have a clue where to look for. Maybe some batches of the AF sensors were/are faulty without them actually having the option to check this properly, yet keeping the production lines up and running.
Forum: Pentax K-5 01-25-2011, 01:08 PM  
Relevant news re malfunctioning AF under artificial light
Posted By lock2nl
Replies: 752
Views: 106,119
I can understand your words, but things are a bit different I'm afraid.
These problems are usually not handled by labs that develop and innovate, but first of all by labs that work according tot strict testing protocols. Suppose the protocols for testing and QC are based on a set of assumptions A, than anything contradicting A wil be spotted as a problem. Nothing else. Of course, this is a highly simplified description but the principles do hold. However, if someone else uses a different set of assumptions B (e.g. derived from practical use), it may be sensitive to totally different things. Sometimes, this thinking 'out of the box' is neccesary to find the origin of the problem, and hence, a solution. This is where people like Falk come in. Basically, this is very common issue with complex products and organisations.

lock
Forum: Pentax K-r 11-20-2010, 06:38 AM  
Kr, do you have a problem ?
Posted By lock2nl
Replies: 14
Views: 3,273
Well, I tend to disagree with a 'let go' approach. If you are not comfortable with a camera, you should either exchange it or get it fixed (if that will ever help, of course).

AF modules are pretty complex. A primary piece of glass that lets through the light, a secondary one to reflect the ligh to the AF module, and third reflection mirror to point the light to the actual sensors. Any malalignment of these mirrors may lead to different beams, particularly if the light has varying wavelengths. My suggestion is to have the internal parts checked.

lock
Forum: Pentax K-r 11-14-2010, 07:19 AM  
Kr, do you have a problem ?
Posted By lock2nl
Replies: 14
Views: 3,273
Forget that one. The Af test I received from Sony and Pentax were all without a 45degree ruler to focus on. You need something parellel to the sensor to focus on. Actually, sony firsthanded me over the moiré test to start with. Really informative. Or should I say confirmative ?

I have used this one as well btw. But results are too inconsistant to make much of it.


lock
Forum: Pentax K-r 11-14-2010, 05:33 AM  
Kr, do you have a problem ?
Posted By lock2nl
Replies: 14
Views: 3,273
It has nine cross-type sensors with a higher sensitivity. These are wider and thicker then normal ones, and are apt to focus on things you did not intend to. (The Sony a700 is a notorious example of this issue). I would blank out the right cross, focus on the left one and bring the ruler outside the range of the central sensor. That way you are sure it focuses on the bar, not on the ruler. If you are sure it focused right, check out the live view result. If the results are fine with LV, I think you should consider sending this one in or ask for new one at the dealer.
Forum: Pentax K-r 11-14-2010, 04:28 AM  
Kr, do you have a problem ?
Posted By lock2nl
Replies: 14
Views: 3,273
Where did you put the focus on ? Left or right cross ?
Forum: Pentax News and Rumors 09-30-2010, 03:09 AM  
if the D7000 is spec'd/priced as rumored
Posted By lock2nl
Replies: 244
Views: 48,675
Thanks for the info
[/QUOTE]

I would not bet on that. I use a D300 with the 70-200 VR, and the latter is definitely a PRO lens. This lens (and also the 200-400 VR) rotates on the mount for about 1/2 a mm, and the fit to the mount of these lenses is not perfect. Problems with lens contacts are far from uncommon with Nikon, but most often easily solved when dirty. But in very dry air (e.g. in freezing weather) the contact issue pops up more often, and you have to move the lens on the mount to regain contact. In moisty weather ( like today...) I've been surprized how easily the rear lens element fogs up. The combo has been with Nikon, and they did improve it a bit. But the remaining play should be considered as typical for this mount with heavy lenses. My Sigma -my all day walk around lens- sits on the mount like a rock, but has considerable less weight.
To me the WR-king is still Pentax.


lock
Forum: Pentax News and Rumors 09-15-2010, 11:12 AM  
if the D7000 is spec'd/priced as rumored
Posted By lock2nl
Replies: 244
Views: 48,675
Let met start with :
- a better multi selector
- better user interface
- better AF mode switch
- sturdier card storage door
- picture control in top lcd
- multi exposure with customer adjustable options in EV range and steps
- tie any release mode to timer
- useable iso 12800, optional h.3,.7 and 1 to iso 25600
- 18 mp but similar hi iso noise as the 16 mp sensor
- more cross sensors
- improved 3d tracking/face detection
- solid video with full time AF as with D7000
- in AF-C, the initial focus lock should be able to provide a sound
- improved AF adjust, similar to Oly, but not per sensor but per lens at 3 different focal lengths and/or distances.

There's more, of course
Forum: Pentax News and Rumors 09-15-2010, 07:25 AM  
if the D7000 is spec'd/priced as rumored
Posted By lock2nl
Replies: 244
Views: 48,675
That's oke Thibs. I do see it.
Forum: Pentax News and Rumors 09-15-2010, 06:37 AM  
if the D7000 is spec'd/priced as rumored
Posted By lock2nl
Replies: 244
Views: 48,675
The D7000 does have AF-adjust, en to FalconEye, I've not encountered anything wrong with my D300 at -20 Celsius. But I did at 10 above zero when the lens contacts were dirty..

The thing about the iso sensitivity is interesting. Usually, Nikon offers max high iso in 3 1/3 EV staps above the normals max. E.g. the d300(s) real max is iso 3200, and H1,H2 and H3 will give you iso 6400. But if iso 12800 and 25600 are extra's, the same implementation would demand H1 to H6. I do not think this is something we should expect, so thay may be using 1EV staps above iso 6400 only. This may be the result of the base iso 100, effectively lowering the max iso, and this predicts that iso 25600 will be fairly useless.
I think a new D400 will again have base iso at 200, with L1,L2 and L3to give you virtual iso 100. It will have max high iso at 12.800, and with H1,2 and 3 giving you slighty better top high iso performance at 25600 then the D7000 and k5 will do. Given the fact that the number of memory banks was too small o nthe D300(s), I expect at least 8 banks. As the d700 does have AF adjust, the D400 will have more sophisticated AF adjust, e.g. like on the Oly's. Furthermore, they will come up with an AF module that needs to beat the current one. Basically with more cross sensors and better algorithms to speed up and improve tracking/face recognition.
If the rumors are true that there might also be a new generation DX sensors coming, we could be surprized to see an 18 Mp sensor in the D400 with the same performances as the 16 Mp one.
This restores camera ranking as they were before, and Pentax will take it usual place. The only party to really change things will be Sony. They may be producing a A7x/xx model that will rival anything at the top end of DX cameras.
The good thing is ,however, we as consumers are by no means poor men's photographers if we were to use a D7000 or a K5 !
Forum: Pentax News and Rumors 05-19-2009, 10:59 AM  
No AF- adjustment in K7 ?
Posted By lock2nl
Replies: 6
Views: 3,586
We trust Peter, do we ?:)

Anyway, now I'd like to know if it allows focal range dependent adjustment but I guess I have to wait for that kind if info..
Forum: Pentax News and Rumors 05-18-2009, 02:55 PM  
No AF- adjustment in K7 ?
Posted By lock2nl
Replies: 6
Views: 3,586
Can't seem to find anything about it in the specs. Did they really drop it ?
Forum: Pentax SLR Lens Discussion 11-03-2008, 05:25 AM  
Tamron 70-200 f/2.8 first test shots
Posted By lock2nl
Replies: 148
Views: 58,400
jsherman999 or anyone else with the Tamron, any change on some pictures and AF impressions in indoor situations ? Preferably moving targets like in sports ? I'm anxious to see the sharpness of it, the shutter speeds you are getting wide open.

lock
Forum: Pentax DSLR Discussion 11-01-2008, 09:31 AM  
Over exposure with K10D
Posted By lock2nl
Replies: 25
Views: 3,260
I'm missing the effective LV's. That's what camera uses to calculate the 'correct' exposure, and deal with the flash. You used F6.7 with 1/100 meaning the EV is about 12. To get back to LV, you have to substract the number of stop over iso 100, which is 2 2/3. As I said, it will be effective Lv should be around 9 1/3.

To give you an example, with a flash picture the camera chose (Av mode) 1/100 at F/5.6 with iso 400. The actual EV is 11.6. Minus 2 for the iso 400 means LV was about 9.6. Indeed, effective LV was metered at 9.5.

Something about the top 2 pictures: The metering of the spot area does not make sense.
The value in the spot area of the left one should be less than on the right side, but they are the same. I do not think you metered , locked the metering and refocused. I suspect this could happen when the aperture is not opened fully when metering.
Forum: Pentax DSLR Discussion 10-31-2008, 03:55 PM  
Over exposure with K10D
Posted By lock2nl
Replies: 25
Views: 3,260
This is tough one...pretty inconsistent LV values I would say. Apart from the MS-M one, most LV series should be more or less similar. I suspect it might be sticky aperture blades. But it could also be that the short distance is poorly handled by the flash. Need some time here.
Forum: Pentax DSLR Discussion 10-30-2008, 08:44 AM  
Over exposure with K10D
Posted By lock2nl
Replies: 25
Views: 3,260
What I meant was to upload a jpg.picture with full exif in flickr. If I download your flickr picture, there's no EXIF data at all.

But here's the way to do it yourself.
First download photome at PhotoME - Exif, IPTC & ICC Metadata Editor and install the exif reader. It reads RAW so you do not have to convert anything.

Start up Photome and open your globe pictures.
All segments metered "AE metering segments", are listed and displayed graphically in LV's.
Save the screen dump as a reference.
Also check out the 'effective LV'.

But first tell me about the exif readings shown in flickr. They all say 1/100 sec at F/6.7, iso 640 . That would bring me an effective LV of a bit above 9. Did you really use the flash (as said on the flickr page) in manual and still used spot metering ??? Or are these exif readings all bull ?
Forum: Pentax DSLR Discussion 10-30-2008, 03:04 AM  
Over exposure with K10D
Posted By lock2nl
Replies: 25
Views: 3,260
I agree with Marc that most of the samples shown are actually 'correct' given the metering mode in the EXIF. The last couple of pictures of the globe are however pretty weird. As suggested it might a recompose issue but is doesnot look like since you more or less reproduced the same scene three times.

The posts on Flickr do not help much since you stripped then of all the exif data. You might think "I mentioned the most important stuff here !", but that's not what I'm after. A full EXIF can tell me exactly what the camera actually metered, and not just in the spot area if you used spot metering.

It looks like this:



So put the jpgs on flickr with all exif data in it and I can have a look at it.

lock
Forum: Pentax DSLR Discussion 09-25-2008, 02:48 PM  
One more K20D review
Posted By lock2nl
Replies: 4
Views: 2,817
Surely he used something else when testing AF ?
Forum: Pentax News and Rumors 09-04-2008, 12:40 PM  
No any leaks from Pentax. Why?
Posted By lock2nl
Replies: 250
Views: 32,335
Finally someone got the message;). We need a Portuguese to understand the Russian:D.
Forum: Pentax DSLR Discussion 07-15-2008, 01:15 AM  
K20D and noise reduction
Posted By lock2nl
Replies: 2
Views: 2,345
Check this one:

https://www.pentaxforums.com/forums/pentax-dslr-discussion/31884-workaround-a...ic-nr-k20.html

Btw, it was reported that hot pixels were no problem at all if exposure was limted to 8 seconds (the trick only seems to work until 8 sec).

lock
Forum: Pentax DSLR Discussion 07-14-2008, 04:18 AM  
Workaround for "automatic" nr on K20
Posted By lock2nl
Replies: 4
Views: 1,961
Well, it looks like it works indeed. Ari from Finland checked it, and as I suggested, he even combined it with the multi exposure- option. This effectively lengthens the total exposure time to as high as about 72 seconds in stead of the 8 seconds limit.
Unfortunately, I have not been able to check it myself cause I already returned my k20d after having tested it for a week. This very thing, the forced NR, was one of the reasons I was not going to purchase it.

lock
Forum: Pentax DSLR Discussion 07-07-2008, 02:17 PM  
Sad Day
Posted By lock2nl
Replies: 71
Views: 10,997
Huuhh ??? Did you really test the a700 ? In bright daylight the differences are small, but still there. But go down to EV 7 and lower. Big difference ! JUst try AF-C and on the k20d and the similar mode on the A700. Try it indoors, or during an evening game of football, soccer, ice hockey or basketball.

lock
Forum: Pentax DSLR Discussion 07-04-2008, 01:19 AM  
Shake Reduction Doesn't Work..?
Posted By lock2nl
Replies: 37
Views: 4,762
And besides that, do letthe SR system get to work. The SR needs some time to stabilize the sensor. (Wait for the little hand symbol after you half press ).

lock
Forum: Pentax News and Rumors 07-02-2008, 04:21 PM  
So where's the 60-250mm f/4 "buzz"?
Posted By lock2nl
Replies: 79
Views: 13,906
Huuhhh ? Is made of gold ? In that case I'd go for the 70-200 Sigma with HSM and buy the 1.4 AF convertor. Cheaper, faster between 70-200, and just as fast but longer if you wish.

lock
Forum: Pentax News and Rumors 07-01-2008, 03:21 AM  
More Canadian price drops
Posted By lock2nl
Replies: 18
Views: 3,661
Expensive you mean ! I can get the k20d below €900, and the cheapest one is €848,- But Tekade is indeed very good.

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