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Forum: Pentax Film SLR Discussion 10-09-2020, 02:12 PM  
Spotmatic Meter switch fix?
Posted By Praktica*ist
Replies: 7
Views: 519
Contrarily to the preceding models, the Spotmatic F does not have a automatic return to OFF , for the lever on the left.

On the F the lever does not cut the circuit, but toogles between open aperture and real aperture measure modes.
It is a photoswitch that performs the circuit cut-off on Spotmatic F, as well as on the Pentax KM and K1000.
Forum: Pentax Film SLR Discussion 09-26-2020, 03:39 PM  
Which legacy m42 Asahi is this?
Posted By Praktica*ist
Replies: 13
Views: 978
Yes, Pentax was the name of the M42 camera from Asahi Optical Company, after the M37 Asahiflex models.
Then to distinguish the newer variants from the original Pentax, they added a touch of letters / a number on top of the camera, hence the S3, SV etc... But they were still marketed as ASAHI PENTAX cameras, engraved in big letters on the front.

Came in 1964, the Spotmatic was a new line, it was special : advanced camera given a fully fledged name on the right front, in addition of being also marked traditionally "ASAHI PENTAX".
But people call them by their specific designation. I guess this was seen as diverting people minds from what should be the real trademark, so they dropped the spotmatic appellation.

The updated Electro-Spotmatic was renamed ES, lower spec's cameras were given short alphanumerical names also (SP500).


Then in 1980's the Asahi naming vanished to just keep PENTAX.

Finally the company changed its name after the products they sold, to be named Pentax Corporation instead of Asahi Opt. Co.
In this period there were seldom cameras given a long name, for example Pentax Program A, but in general the company stuck to giving their cameras short letter names or short alphanumerical names, to this day (KM, ME, LX, Z1, MZ-S, K10, K7 etc...)
Forum: Pentax Film SLR Discussion 09-25-2020, 10:37 AM  
Which legacy m42 Asahi is this?
Posted By Praktica*ist
Replies: 13
Views: 978
Hello. Which M42 Asahi is it ? The answer to to the first post question is simple. It's an ASAHI PENTAX !!
It's obviously written right there on the front, right ? :p

Ahemm... Seriously, as the camera has no additional designation engraving besides its (low) serial # , it is the "AP", the original, the very first Pentax.
It is not the rarest camera of the original Pentax line going from this one to the SV. But it is really rare nonetheless, especially in this condition.

It is not the first M42 reflex camera either, as the firsts were german.


Is it still working somewhat correctly on top of that ?

As for the lens, the 58 f/2 is an even more amazing find, a modified Sonnar design, the only Sonnar standard lens existing for a reflex. A special design.

Don't hesitate to try it out on a more recent camera or a DSLR.

Enjoy !
Forum: Pentax Film SLR Discussion 09-17-2020, 11:36 AM  
Gear P0rn - post it if you got it.
Posted By Praktica*ist
Replies: 7,253
Views: 919,416
Looks in shiny condition, from the little we can see. Can you show more ? :D
Forum: Pentax News and Rumors 09-04-2020, 08:51 AM  
Product Stories of New APS-C
Posted By Praktica*ist
Replies: 501
Views: 41,322
So, I have seen the part 3 of the stories, about why they did not equip the K-new a tilt / orientable screen.
This makes sense. The new viewfinder is more compact, the overall layout is more compact, so the screen has to be kept compact as well.
The K-new will have 61.8 mm depth, which is not a lot, if you think about how little it is, above focal flange distance : 61.8-44.5 = 17.3mm.
Just above 17mm to fit all of these : sensor circuit, image stabilizer plate, image stabilizer chassis, mainboard, screen circuitry, screen glass.
People, this is impressive engineering.
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 09-04-2020, 08:16 AM  
Is there a market for Canon FD lenses anymore?
Posted By Praktica*ist
Replies: 30
Views: 1,393
Hello.

There is certainly some market value, and not the least in Canon FD lenses.
Recent rise in mirrorless cameras has made them adaptable to many mounts.
Whereas they were not adaptable to digital reflexes before.


Moreover, guess which reflex is one of the top most demanded, on the film camera scene ? :p
A probably over-rated and over-priced camera, but still full of charm.
Yes, the Canon AE-1 and AE-1 program.


This means you will probably not have any difficulty selling glass for the FD mount system, at a good price. :cool:
Forum: Pentax Film SLR Discussion 08-29-2020, 03:29 AM  
Gear P0rn - post it if you got it.
Posted By Praktica*ist
Replies: 7,253
Views: 919,416
I'm not a Nikon connoisseur either, but the F2 uses the fork as aperture coupling, so it does not need the lens to be an Ai.
Forum: Pentax SLR Lens Discussion 08-25-2020, 07:14 AM  
prime, prime, everywhere a prime...
Posted By Praktica*ist
Replies: 11,549
Views: 584,393
@ pepperberry farm I like you dog's portrait very much. Is it really at f/2 ?
Forum: Pentax SLR Lens Discussion 08-21-2020, 09:39 AM  
prime, prime, everywhere a prime...
Posted By Praktica*ist
Replies: 11,549
Views: 584,393
Hello. The lens you are referring to is the Macro-Prakticar 55mm f/2.8, that was produced in quite reduced numbers, by Carl Zeiss in Jena, only in Praktica-B mount, from 1981 to 1989.
Sadly, it was never available in M42 mount. CZJ only considered to produce a specialized macro lens very lately, as the east-german ordinary lenses in M42 (Pentacon 50 f/1.8 and Pancolar 50 f/1.8, as well as the Flektogon 35 f/2.4) have very short focussing distances, and various extension tubes were also available.
Forum: Pentax Film SLR Discussion 08-21-2020, 02:11 AM  
M42 SLR Cousin: Revue ML/Praktica MTL5B
Posted By Praktica*ist
Replies: 17
Views: 2,146
Nice find. These Praktica's will take any M42 lenses (except some really old series).Your Praktica was probably stripped from its Pentacon (or similar) 50mm lens by someone willing to play with it on digital.
Forum: Pentax Camera and Field Accessories 08-20-2020, 11:52 AM  
Pentax Spotmatic Corrective Lens Size
Posted By Praktica*ist
Replies: 9
Views: 508
Hello.
I'm using the Nikon rectangular eyepiece correction lens DK-20C on my Spotmatic F. It has the right overall size. Notice that at first, it was very hard to push into the viewfinder's guiding rails. But after a fine filing work on the grooves of its plastic housing, the correction lens will fit right in. :cool:
Forum: Pentax News and Rumors 08-16-2020, 09:51 AM  
R03010 = K-new was registered by FCC on 27 July 2020
Posted By Praktica*ist
Replies: 238
Views: 27,180
I think calling it K-2 would be a mistake, as it would use a naming that could be useful for an entry-level full-frame camera, if maybe, by some sort of miracle, Ricoh manages to offer two full frame cameras.
Forum: Pentax SLR Lens Discussion 08-16-2020, 09:46 AM  
Check you old lens carefully!
Posted By Praktica*ist
Replies: 21
Views: 2,212
May I suggest to use the tips of a caliper to realize the alignment of the doublet ?
Forum: Pentax SLR Lens Discussion 08-16-2020, 08:36 AM  
Check you old lens carefully!
Posted By Praktica*ist
Replies: 21
Views: 2,212
Very interesting tentative !

Are the two elements the same size ? This would make the realignment possible without optical bench.
Forum: Troubleshooting and Beginner Help 08-16-2020, 07:48 AM  
"all-dark" photos with K-50 viewfinder
Posted By Praktica*ist
Replies: 25
Views: 1,731
It is fully closed.



On a K mount, with the lens set to "A" or a fully automatic lens like the 18-55mm kit lens, the resting position of the aperture lever is fully closed.
It is the case when the lens in not mounted on the camera. It is spring loaded.
When you mount the lens on a camera, the aperture control lever of the camera engages and moves the lens aperture lever : the lens aperture is now fully opened.


What should happen (on a good working camera) when you take a photo, is an aperture control lever that moves the exact displacement in millimetres to make your lens close at, say f/5.6.
It is a displacement proportional to the desired aperture value.

On a K-30 / K-50 etc... that has an aperture block failure (solenoid problem), the control lever does not stop to the right position, it goes full travel, letting the spring inside the lens fully close the aperture (f/22 or f/32 depending on the lens).
Forum: Troubleshooting and Beginner Help 08-16-2020, 07:14 AM  
"all-dark" photos with K-50 viewfinder
Posted By Praktica*ist
Replies: 25
Views: 1,731
Hello.
Well, this is an aperture block failure case, again...

You have a Pentax-A 50mm f/1.7 ? So you will still be able to take photos on manual mode, by one at a time light metering, using the green button. You will have to rely on your aperture ring on the lens. This is your best option before having the K50 repaired.

What currently happens, when you have the dreaded K-30 / K-50 aperture block failure, is an uncontrollable aperture condition : the camera always releases the aperture lever of the lens fully. This causes the aperture to be closed at his maximum, no matter what value you set **on the camera**. The way to avoid the problem is to have a lens with aperture ring at hand. In this case, the closing aperture value is set directly by the lens ring, and it does not matter that the camera releases the lever fully. If your lens is set to f/5.6 you will get that value, and not f/22 - f/32 unlike on a fully automatic lens.
Forum: Pentax News and Rumors 08-13-2020, 03:48 PM  
R03010 = K-new was registered by FCC on 27 July 2020
Posted By Praktica*ist
Replies: 238
Views: 27,180
Will it incorporate a mechanical clockwork knob for self-timer functions, like the SV ?

I would be retro-hyped as crazy ! :p
Forum: Pentax SLR Lens Discussion 08-13-2020, 10:58 AM  
Help! Destroyed screws in PENTAX-M 1:2.8 35 mm
Posted By Praktica*ist
Replies: 10
Views: 1,523
I just grabbed a Pentax-K lens, removed a screw, and my caliper lines up at 1.95 mm for the threaded part.
On maybe the 2 in M2 is about internal diameter, without the helicoid ?? :confused:


Edit : after a short research, the number in metric standard screw is indeed the external diameter of the thread. The real measurement can be a little less, because the carving of the original rod from which the screw is produced removes a bit more material than intended. Hence the 1.95 mm I measured. The second number indicates the thread length, sometimes excluding the head, sometimes not (countersunk type).


So I will order M2*3 mm DIN-7985 screws, and sand the head to approximate the dimensions of K-mount ones. Unless someone has a better reference.
Forum: Pentax DSLR Discussion 08-13-2020, 10:49 AM  
Suggestion for buying a beginner-to-intermediate Pentax?
Posted By Praktica*ist
Replies: 37
Views: 2,414
If you can cope with manual metering on the field, by using the green button, it is a viable option. I've done so for a decade ! :lol:

There are plenty of Pentax (or compatible) lenses that still have an aperture ring.
It is a bit slower method of taking photos. You have to remember clicking the green button when lighting conditions or aperture change.
Apart from that, after a bit of practice, it is absolutely feasible and enjoyable.


The only thing you will miss is flash automation. So if your practice involves flash, you are out of luck and should have our K-S1 repaired.
Forum: Pentax News and Rumors 08-13-2020, 09:15 AM  
R03010 = K-new was registered by FCC on 27 July 2020
Posted By Praktica*ist
Replies: 238
Views: 27,180
About a dozen years would be sufficient while being all DSLR's ?? You can't be serious.
There are plenty of letters in the alphabet and digits still unused to avoid reusing a previous DSLR name.
Forum: Pentax SLR Lens Discussion 08-13-2020, 07:51 AM  
Help! Destroyed screws in PENTAX-M 1:2.8 35 mm
Posted By Praktica*ist
Replies: 10
Views: 1,523
Mega-bump ! :D

So, I had stripped a few screws on K-mount lenses way before. Now I'm more cautious on applied forces, for avoiding the cam-out of the screwdriver. Plus, having Japanese-made cross point screwdrivers also helps.

Nevertheless, I have several lenses, which have been badly tinkered by previous owners. Some screws here or there need replacement, and I cannot find exact replacement parts for these K-mount miniature screws.
Here is what I measured with an old caliper :

  • Apparently 2mm thread diameter, so a metric M2 thread, most probably a standard pitch.

  • 3mm total length.

  • Only about ~0.6mm head thickness, flat-type.

  • 3 mm head diameter.



In my country, I have found only one online serious supplier for general public, that provides many micro-screws, with the appropriate data. But none of them are a good match for K-mount screws.
Their nearest equivalent that I found are described like this :

  • DIN 7985 norm, mmmh OK,

  • M3 , M2.5 , M2, or M1.6 or even thinner. M2 seems about right.

  • 1.6 mm head thickness, which seems quite too thick,

  • 4 mm head diameter, flat on the inner side, slightly bulbous on the tip side.

  • Available with 3, or 4, or more total length.


So it would be maybe possible to take a 4mm length screw like this, sand the head to make it thinner, sand again the head but tangentially, in order to reduce its diameter down to 3mm or so.
And hope there is still enough material left to engage a PH0 / PH00 screwdriver properly. :confused:

I have some modelling tools to do the trimming. But it would be a lot of hassle, for each screw, and many to modify.



So if anyone has a better source for K-mount replacement screws, and confirm my measurements, it would be very nice indeed.
Forum: Pentax News and Rumors 08-08-2020, 01:16 PM  
R03010 = K-new was registered by FCC on 27 July 2020
Posted By Praktica*ist
Replies: 238
Views: 27,180
It is not only about people who bought the KP and are quite happy with it, despite the limitations.
I'm sure many people feel the KP is just fine for them.
But this represents only one side of the coin.
It is also about the sales that Pentax have lost, because KP's lack of features that some photographers consider important.
Features that would have made the KP stand on level or above the competition, but Ricoh have not managed to implement.


You may consider the KP was not intended as a replacement for the K3-II.
But in fact there is no higher level APS-C Pentax camera, since late 2017.
So the KP replaced the K3-II without some important features.
Forum: Repairs and Warranty Service 08-08-2020, 08:08 AM  
Pentax Spotmatic CLA and repair by Garry's Camera in Illinois
Posted By Praktica*ist
Replies: 13
Views: 1,053
It is good to see there are still camera repair shops that are able to perform a CLA on these legendary Spotmatic's.
Forum: Pentax News and Rumors 08-08-2020, 08:02 AM  
R03010 = K-new was registered by FCC on 27 July 2020
Posted By Praktica*ist
Replies: 238
Views: 27,180
The use of the small entry-level D-LI109 battery for the KP, was I think, a big mistake by Pentax. As was the absence of second SD card slot.
These, added to absence of upper LCD control screen, made the KP look as straight downgrade for users of K-3.
I'm glad Pentax took notice and corrected these lacks for the K-new (be it called K-2, KP-2, K-3 mk III, K-9, or whatever).


I hope it is not too late for Pentax to release an APS-C enthusiast / semi-pro reflex, given the current dire photography hardware market.
Forum: Pentax DSLR Discussion 08-06-2020, 08:40 AM  
Suggestion for buying a beginner-to-intermediate Pentax?
Posted By Praktica*ist
Replies: 37
Views: 2,414
Just above 10k clicks ? That is quite a low count ! :confused:
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