Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Pentax / Samsung dSLR, K Mount Mirrorless

Reply
 
Thread Tools Search this Thread
Old Aug 6, 2006, 10:52 AM   #1
Senior Member
 
Join Date: Jan 2006
Posts: 344
Default

As you may know in my recent post, I have been a new K100D user: http://www.stevesforums.com/forums/v...01&forum_id=80

After having owned 3 *ist D and 3 *ist DS bodies which none of them can ever focus acceptably accurate with my good old FA*85/1.4 by its AF, with large and obvious AF errors, no matter they are re-calbrated by local Pentax/Pentax Japan or *not*. My new K100D is the first Pentax DSLR which I have ever put in my hands which can work, practically! Do note that my FA*85 has no major focus issues on my MZ-S, MZ-30 or even my 1987 made SFX camera bodies, so I do believe it is not a lens problem.

Now, it focuses fairly accurate under (only) *normal* *daylight*. Under tungsten lighting, front focusing still occurs but now the magnitute of errors is smaller (as it is now *fairly* accurate under typical daylight). Now that under daylight, the AF can do at least as good as what I can do with very *careful* MF on *ist D and DS which has a bigger viewfinder. For more about this AF accuracy dependancy on color temperature of the light source of *ist Ds Pentax DSLR, you can have a look on this:-
http://www.geocities.com/ricehigh/DS...cy_on_KEV.html

I am now very happy to see this good result as my previous experience with the entry level *ist DL is that the AF accuracy is even worse. As such, I supposed the K100D might be the same as it is the entry level DSLR (and its low price has presented it is). Indeed, I am very glad that I can report a "positive" thing this time although it should work as it is supposed (to be).

RiceHigh
http://www.geocities.com/ricehigh
RiceHigh is offline   Reply With Quote
Sponsored Links
Old Aug 6, 2006, 12:09 PM   #2
Senior Member
 
Peacekeeper's Avatar
 
Join Date: Jan 2006
Posts: 1,024
Default

Well for a person who is known to be quite critical of the poor old Pentax, I am happy to hear that you are Happy witht he K100D :-).

Looking forward to seeing some of your pics too.

Crash

Peacekeeper is offline   Reply With Quote
Old Aug 6, 2006, 3:56 PM   #3
Senior Member
 
Join Date: Sep 2004
Location: Wigan, UK
Posts: 568
Default

can you post some examples?? because my dl2 focuses where I want it. or maybe you just do some scientific tests which have nothing to do with real life??
gfurm is offline   Reply With Quote
Old Aug 6, 2006, 10:53 PM   #4
Senior Member
 
Monza76's Avatar
 
Join Date: Jul 2004
Posts: 4,093
Default

RiceHigh, given your hypercritical fascination with measurement and accuracy I will have to conclude that the K100D is indeed a fantastic camera. If you find it "fairly accurate" then the average Joe like me will always be impressed.

Keep on measurin"
Ira
Monza76 is offline   Reply With Quote
Old Aug 8, 2006, 1:08 AM   #5
Senior Member
 
Join Date: Jan 2006
Posts: 344
Default

Crashman wrote:
Quote:
Well for a person who is known to be quite critical of the poor old Pentax, I am happy to hear that you are Happy witht he K100D :-).

Looking forward to seeing some of your pics too.

Crash
I shall include some sample pics in my review when it is published, at my homepage.

RiceHigh
http://www.geocities.com/ricehigh
RiceHigh is offline   Reply With Quote
Old Aug 8, 2006, 1:13 AM   #6
Senior Member
 
Join Date: Jan 2006
Posts: 344
Default

Monza76 wrote:
Quote:
RiceHigh, given your hypercritical fascination with measurement and accuracy I will have to conclude that the K100D is indeed a fantastic camera. If you find it "fairly accurate" then the average Joe like me will always be impressed.

Keep on measurin"
Ira
Not really, Ira. All the errors I have found before were discovered during actual shootings. And these inaccuracies were then verified and located exactly by measurbation lab tests. So, I think "average Joe" would also see them if they use the same equipment as mine and/or under the same shooting conditions. In particular, as many FA*85/1.4 users reported, there is obvious AF errors when the lens was used near wide opened, with *ist Dx cameras.

I don't think you're an "average Joe", anyway :-)

RiceHigh
http://www.geocities.com/ricehigh
RiceHigh is offline   Reply With Quote
Old Aug 8, 2006, 1:17 AM   #7
Senior Member
 
Join Date: Jan 2006
Posts: 344
Default

gfurm wrote:
Quote:
can you post some examples?? because my dl2 focuses where I want it. or maybe you just do some scientific tests which have nothing to do with real life??
I think the errors only shown up with fast longer primes like 85/1.4 or 100/2.8 etc. (less obvious with 43/1.9) at near wide opened. I won't show the examples as they are merely out of focus pics, e.g. those portraits taken with the FA*85/1.4 at large apertures.

If you really want to see some, I can show you the shots of simply a black line drawn on a white paper. Then you will see the *ist DS is usually out-focusing while the K100D is nearly spot-on.

RiceHigh
http://www.geocities.com/ricehigh
RiceHigh is offline   Reply With Quote
Old Aug 8, 2006, 1:18 AM   #8
Senior Member
 
Join Date: Jan 2006
Posts: 344
Default

gfurm wrote:
Quote:
can you post some examples?? because my dl2 focuses where I want it. or maybe you just do some scientific tests which have nothing to do with real life??
I think the errors only shown up with fast longer primes like 85/1.4 or 100/2.8 etc. (less obvious with 43/1.9) at near wide opened. I won't show the examples as they are merely out of focus pics, e.g. those portraits taken with the FA*85/1.4 at large apertures.

If you really want to see some, I can show you the shots of simply a black line drawn on a white paper. Then you will see the *ist DS is usually out-focusing while the K100D is nearly spot-on.

RiceHigh
http://www.geocities.com/ricehigh
RiceHigh is offline   Reply With Quote
Old Aug 10, 2006, 2:51 AM   #9
Junior Member
 
Join Date: Feb 2006
Posts: 1
Default

I agree with RiceHigh, I too sometimes get front-focus errors on my DL with FA 50/1.4, especially when using it wide open - sometimes it focuses fine, but on most occasions when using 1.4 upto 2.0 I found that I can better focus with my eyes.
Cristian78 is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 12:25 PM.