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Forum: General Photography 11-09-2018, 11:08 AM  
DSLR Viewfinder V SLR Viewfinder Why is DSLR darker?
Posted By RKKS08
Replies: 10
Views: 728
What you see in the viewfinder of an APS-C camera IS darker.

The illumination per area of the projection to the sensor or screen is the same as with FF (at the same aperture setting).
But the size of the picture (for both sensor and screen) is just half of it.
So you either get a picture as bright as with FF, but half the size, or you optically enlarge it by 2x in the viewfinder path (ocular) and get half the brightness.

Law of physics.
Forum: Pentax DSLR Discussion 11-09-2018, 10:39 AM  
Metering Settings
Posted By RKKS08
Replies: 5
Views: 614
Generally I agree with stevebrot and pschlute.
I use center spot for AF, and matrix measurement for lenses which support it (if they don't, locking EA with AF wouldn't make much sense anyway).
And because I use center for AF, I always recompose - this is also a habit automatically taken over from non-AF SLR times. And then AE-AF lock would make even less sense.
Forum: Pentax SLR Lens Discussion 11-09-2018, 10:27 AM  
Getting into Anamorphic lenses on a budget?
Posted By RKKS08
Replies: 5
Views: 494
My personal opinion:
If you don't care for IQ then you don't need an anamorphic lens or lens adapter. You will get the results by using a wider lens (2x or more the angle of view you want), and crop.
Indeed Schneider AM lenses/adapters (thought to be very sharp) are in the range of $1500 - $3500. There are also Lomo sets (not sure whether also for DSLR or video cameras only), which are cheaper. Even sets for 43 are very expensive.
And if you look for used ones, they are not so much cheaper.

As far as I know, if you use a normal AF lens with an anamorphic adapter, phase detect AF fails, and manual focusing seems to be tricky. Maybe you can find an English speaking internet forum specialized on the subject.
Forum: Troubleshooting and Beginner Help 11-06-2018, 10:44 AM  
Cannot View K-5 Camera Images on PC
Posted By RKKS08
Replies: 11
Views: 428
The exFAT driver provided with KB955704 as linked by Not A Number and stevebrot are only compatible with the English version of XP.

For users of a German XP I found an old discussion in the German winfuture-forum.
One member offered to PM the WindowsXP-KB955704-x86-DEU.exe.
When he got hundreds of requests to send it, he gave up and up-loaded it to the Amazon-cloud.
Presently it is still available there:
Amazon Drive

Of course I cannot guarantee for anything. I would suggest to virus-scan before you install it.

---------- Post added 06-11-18 at 19:41 ----------

Searching in old discussions related to exFAT, I found that this file system was made transaction-safe only when used with Windows 6 (Vista, Server 2008) or newer. According to MS, failure of this file system resulting in data loss happens seldom, but cannot be ruled out when exFAT is used with Windows 5 (XP, Server 2003).

This could be the reason why MS withdraw the XP/Server 2003 versions of the driver for all languages.
Forum: Troubleshooting and Beginner Help 11-06-2018, 09:30 AM  
Cannot View K-5 Camera Images on PC
Posted By RKKS08
Replies: 11
Views: 428
Indeed its is.
On one of my computers I still use XP/32bit and there are no problems to see PEF files with every viewer and explorer/explorer replacement.
Forum: Troubleshooting and Beginner Help 11-06-2018, 09:16 AM  
Cannot View K-5 Camera Images on PC
Posted By RKKS08
Replies: 11
Views: 428
The file system of SDXC is from Microsoft and different/not compatible with the organisation of the SD/SDHC file systems.
To make XP understand it, you would need to install special drivers for SDXC.
Presently I am too lazy to search for information whether MS offers these drivers also for XP, but I think you could do this by yourself.

EDIT;
If those drivers exist, it is still not sure whether they would support/be supported by the reader you are using. This may be also pre-SDXC.
Forum: Troubleshooting and Beginner Help 11-06-2018, 08:45 AM  
Cannot View K-5 Camera Images on PC
Posted By RKKS08
Replies: 11
Views: 428
Do you use an original Pentax USB cable?
As far as I remember, the DSLR industry started using mini and micro USB connectors before these became the official (final) standard. It seems there are lines/contacts used which the standard just ignores. These were left free for proprietary use by manufacturers.
Most cables not designed for Pentax DSLRs will still work, but not all of them.

By the way, I get identical behavior as you if I try to read a formatted SDHC card in early models of SD card readers.
Forum: Pentax Film SLR Discussion 11-03-2018, 09:08 AM  
28-80 power zoom advice
Posted By RKKS08
Replies: 10
Views: 382
In 1991 I bought a Z-10 with this powerzoom at a sell-out (new with guarantee) for the eqivalent of $80.
It did not see much use, as the first 2 rolls showed it offered the worst IQ of all the lenses I owned at that time.

Years later (after I had started with digital) I got a Z-20 with the SMC Pentax-FA 28-80mm F3.5-5.6 on eBay for a very low price. After comparing pictures taken with the K200D, I sold the Z-10 with the powerzoom. The non-PZ FA was MUCH better.
Quite decent, despite being downvoted in our lens review area.
But not even near to the stellar (and not very common) SMC-A 3.5-4.5/28-80.

EDIT: There is also a non-SMC A 3.5-4.5/28-80, sold in big numbers bundled with Pentax cameras which were not the top models (A3/A3000, Program A, cheaper P series models). This is not only missing the SMC coatings, but the optical design is much simpler (less groups/elements).
Forum: Pentax SLR Lens Discussion 11-01-2018, 05:17 AM  
Which classic 50mm f1.4?
Posted By RKKS08
Replies: 31
Views: 1,013
Optics of the M, A, and FA versions are identical, and it seems the coatings as well.
If you don't like stop-down measuring, it would leave the A and the FA.

Prices of used FAs in Germany are about double versus the A.
This would be only for AF and some additional information for in-camera corrections. But then the 1.4 does not need much corrections (in some cases maybe slight vignetting).

@pschlute
I have not tested it myself, but referring to many comments in this forum and others, it seems the 1.4 has a slightly bigger field curvation, whereas the 1.7 has nearly macro lens characteristics.. If so, you would probably only see this difference shooting flat (2D) objects with fully open aperture at short distances.
Forum: Welcomes and Introductions 10-13-2018, 09:49 AM  
Greetings from Berlin
Posted By RKKS08
Replies: 6
Views: 216
Welcome to the forums from Frankfurt (am Main).
Forum: Welcomes and Introductions 10-11-2018, 09:49 AM  
Hello from southern Bavaria
Posted By RKKS08
Replies: 8
Views: 309
Welcome to the forums, and greetings from Frankfurt (am Main).
Forum: Pentax Film SLR Discussion 10-06-2018, 01:50 PM  
Super Program / Super-A Battery Drain Issue
Posted By RKKS08
Replies: 14
Views: 620
That was also my first idea when I read the post.
Flickering light could be caused by a defective button, which contacts never are fully apart.
Forum: Troubleshooting and Beginner Help 10-06-2018, 01:25 PM  
Aperture ring not working on K3
Posted By RKKS08
Replies: 5
Views: 472
Pentax is not the ony one whose cameras need stop down metering with prior-AF lenses.

I would call it a compromise.
They prefer users to buy their new lenses (more profitable than bodies, I think), but cutting off the possibility to use the older lenses would cause a negative image. And it makes the bodies slightly cheaper, and less complicated to assemble and service.

But of course everyone including me would like it better if that lever was not missing.
Forum: Site Suggestions and Help 10-03-2018, 09:09 AM  
Question Copy and paste posting
Posted By RKKS08
Replies: 12
Views: 451
If you use a browser or an add-on/extension which alllows control of javascript scripting, enable/disable "ajax.googleapis.com" will alter what is shown and what is working.
It also changes the way how sub menues of the menues in the header block of Forums Home behave.

Before Pentaxforums made https a standard, I had to make googleapis switchable.
Enabled, I had all the enhanced possibilities of the post editor, but https did not work
Disabled, I could use https, but just a plain editor.
And I remember there was a serious problem with externally stored pictures as well.
Forum: Lens Clubs 10-03-2018, 08:17 AM  
East German Lens Club
Posted By RKKS08
Replies: 339
Views: 50,806
As far as I know (but I also relate only on German photo sites), the Carl Zeiss Jena MC 1.8/50 is identical with the Prakticar 1.8/50, and is a Pankolar design.

The Pentacon 1.8/50 is a Meyer-Görlitz design (Meyer-Görlitz Oreston 1.8/50).

EDIT: On German eBay there are quite frequently offers of the CZJ 1.8/50 with PB (Praktika B) mount.

---------- Post added 03-10-18 at 17:36 ----------

With some PB mount lenses a conversion to K mount is possible - despite the fact the register distance with PB is slightly smaller than with K.

One of our PF members posted a description in another forum:
Pentacon Pancake on a Pentax!
Forum: Pentax K-3 09-29-2018, 01:10 PM  
K3 and legacy (non-conductiv) lenses
Posted By RKKS08
Replies: 19
Views: 770
With all my Pentax DSLRs the result of a green button measurement in M mode will stay valid. If you take several pictures in a row with unchanged light conditions you need to press the green button only prior to the first shot.

And if the light changes a bit and you have the feel (and some experience), you can slightly modify either exposure time or aperture with the wheels. Again no green button measurement needed.

In many situations this behaviour can speed up your workflow considerably.
Forum: Troubleshooting and Beginner Help 09-27-2018, 03:07 PM  
Macro lens on the cheap
Posted By RKKS08
Replies: 20
Views: 849
This lens offers a "macro" capability, as many zoom lenses do.
But generally real macro starts at 1:2, whereas most of the zooms offer only 1:4.
According to
The Vivitar Series 1 28-90 mm f/ 2.8-3.5 Lens. Specs. MTF Charts. User Reviews.
your lens offers 1:3.3, but unfortunately at 28mm, not at 90mm, so for insects you will have to go quite near.

I would describe 1:3.3 as "close focus", not real macro, but the crop factor of APS-C helps a bit.
I don't know about the IQ of this lens used as a "macro", maybe it is good.
Some zooms offer excellent IQ in the close focus range, some do not.
Forum: Pentax DSLR Discussion 09-26-2018, 02:53 PM  
Best value-for-money APSC body
Posted By RKKS08
Replies: 34
Views: 2,289
??
Even the K-5 is a VERY big step from the K-x.

Featurewise, resolutionwise, high ISO, and it was the flagship model. And you should be able to get it for about $200, with not much more than 10k shutter actuations.. And this is not a lot for a K-5.
The advantages of the K.5II are the better back LCD and a (more often) accurate AF if light comes from energy saving and LED bulbs. As far as I know, this problematic behaviour was improved, but not completely solved with the K-5II, only with the K-3.
Forum: Site Suggestions and Help 09-23-2018, 11:44 AM  
Question Why inconsistant number of members
Posted By RKKS08
Replies: 4
Views: 274
Of course that's what I think, too.

But a difference of roughly 33% between these 2 numbers is a lot.
Is someone afraid the number of members could drop by 20000 within a short time, and force another modification?
Forum: Site Suggestions and Help 09-23-2018, 11:39 AM  
Question Missing pictures in the review sections
Posted By RKKS08
Replies: 2
Views: 205
Thank you, I will try to find out of which items I own the pictures are missing, and take shots of these.
By the way, I now think a couple of years ago I already asked the same question.
Forum: Site Suggestions and Help 09-22-2018, 05:05 PM  
Question Missing pictures in the review sections
Posted By RKKS08
Replies: 2
Views: 205
I found items in the review section (even with existing reviews) where the picture is missing, in the desription as well as in the list leading to the reviews. One or two of these (I think it were lenses) I own myself.

How is it possible to add the missing picture(s) to the description of an existing entry?
Forum: Site Suggestions and Help 09-22-2018, 04:11 PM  
Question Why inconsistant number of members
Posted By RKKS08
Replies: 4
Views: 274
Near the bottom of the Pentaxforums Forum Home page its says "79,261 members".
Near the top of the same page it says "60,000+ Members and counting".

Mathematically that's of course not wrong.
But is there a special hidden sense in leaving that number lagging behind? :):lol:
Forum: Pentax SLR Lens Discussion 09-21-2018, 09:53 AM  
Which 3rd party PK lenses you treasure the most?
Posted By RKKS08
Replies: 75
Views: 3,411
From 1981 till about 1987, I read nearly every single lens test in German magazines.

For this era, the results were roughly the same.
Of all the 3rd party brands, the only one maker who always was very near to the original "big five" lenses (Canon,Minolta,Nikon,Olympus,Pentax) was Tokina. And, disregaring the coatings, quite often equal.
And nearly always the worst (but also the cheapest) were Makinon lenses.
Sigma, Tamron, Vivitar, Soligor varied quite a lot.

What seemed strange (at the first glance) was the fact, that Tokina AT-X lenses seemed to lag behind.
But their advertisements from the start of this series reveiled the reason:
AT-X ("advanced technology") were lenses where one or more characteristics were new and/or unique at the time the lenses were introduced. It did NOT mean the over-all performance was the best available.
I found this to be very true after buying the just introduced AT-X 2.8/35-70. It was very sharp, but showed significant loss of contrast at F2.8. But then I needed the 2.8 for my auto flashes, which did only offer auto mode at selected aperture values (dependent on ISO).

Later Tokina added the AT-X Pro series, which were really meant to compete with the lenses of the Big Five. And they did.

I used to own many Tokina lenses, and the one which impressed me most was the Tokina RMC 3.8/75-150, bought used in 1982 for small money. Maybe I got an exceptional good copy, but with slides I could not see any difference to Pentax prime lenses. Unfortunately, for the PK-A mount Tokina replaced it by the 70-210, which is only at a part of its range up to the older lens design.
I have not used the 75-150 with digital (yet), as I gave it to my sister after purchasing the 70-210.
Forum: Welcomes and Introductions 09-20-2018, 09:46 AM  
Hello
Posted By RKKS08
Replies: 6
Views: 209
Hello, and welcome to the forum.

I switched to Pentax (a ME Super) in 1981.
Forum: Repairs and Warranty Service 09-20-2018, 09:31 AM  
*ist DS Exposure Issue
Posted By RKKS08
Replies: 5
Views: 332
I think Adam means contaminating the light sensors.
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