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Forum: Pentax K-1 04-19-2019, 04:50 AM  
DA 16-45 on the K-1?
Posted By funktionsfrei
Replies: 11
Views: 1,073
Well, the 15-30 seems to be the answer to your need, a pricey one, though.
Forum: Pentax K-1 04-12-2019, 02:33 PM  
DA 16-45 on the K-1?
Posted By funktionsfrei
Replies: 11
Views: 1,073
The DA16-45 is an APS-C lens, thus not really useful on the K-1.


To get the same image angle on the K-1, you'd need a 24-75 lens.

For unfathomable reasons, Pentax decided to create a 28-105mm lens instead of an equivalent to the DA16-85, which would have been a 24-128. The four missing millimetres at the wide end are essential.

For real wide angle, you'd better get the Sigma 12-24 (in contrast to the DA12-24 the Sigma is a "full frame" lens), or a prime like the 11mm irix or the new Samyang 10/3.5 (the widest rectilinear ultra-super-duper wideangle lens for "full frame"). For reasons of sheer and utter stupidity*, Sigma ceased production of the 12-24 in Pentax mount around the time the K-1 came out.

*) No, that's not marketing. That's a dumb decision. The K-1 is the first camera since the end of the film era that actually can use the lens, and they quit making it -- after ten years of selling this lens for uses below it's potential on APS-C.
Forum: Pentax K-1 03-07-2019, 01:37 PM  
No Spin wanted , rotating front elements!
Posted By funktionsfrei
Replies: 6
Views: 696
The FA24-90 doesn't rotate it's front lens, and that could well be considered a "film-era" zoom lens, as it still has an aperture ring.


The FA100-300, the A28-80 and the A35-70 as well are "rotators".
Forum: Pentax K-1 11-04-2018, 07:37 AM  
Quick and Dirty K-1 IS Test
Posted By funktionsfrei
Replies: 6
Views: 1,023
I've got a friend who's able to take exposures in the 1-second-range without noticeable camera shake. And that without an image stabilizer.


Anyone capable of longer hand-held exposures must be dead or something.
Forum: Pentax Film SLR Discussion 10-31-2018, 07:08 AM  
ME Super not rewinding?
Posted By funktionsfrei
Replies: 14
Views: 770
That's really not necessary. The problem is not rewinding, the problem is winding. And that can be checked without ruining a roll of film. Check the small window below the forwarding lever. If the orangish lines don't move, the film doesn't move.


You'll just have to check this when spooling in a new film, the first few movements of the forwarding lever (after closing the camera's back) must result in activity in the window. If it doesn't, re-open the camera's back and try to correct the film's insertion into the winding spool.

It's not that difficult, I managed that as a teenager, when the ME Super was spanking new.
Forum: Pentax Film SLR Discussion 10-31-2018, 04:05 AM  
ME Super not rewinding?
Posted By funktionsfrei
Replies: 14
Views: 770
The ME Super has a small window below the film forwarding lever (on the right hand side of the camera's body), where you can check the film movement. This helps with loading film correctly.
Forum: Pentax K-1 10-19-2018, 11:16 AM  
Mirror lockup and potential sensor damage ...
Posted By funktionsfrei
Replies: 7
Views: 881
It is possible to damage the shutter with too much sunlight, so MLU isn't the best thing to do when pointing the camera directly at the unfiltered sun. Even the iris inside your lenses can be ruined.


See here: Lens Rentals | Blog
Forum: Pentax K-1 10-11-2018, 12:35 PM  
Best on camera field monitor
Posted By funktionsfrei
Replies: 10
Views: 1,250
"Feelworld 7" HD 1920*1440 IPS TFT-LCD DSLR Video On Camera Monitor with HDMI"

That product's name combined with the fact that is actually has a native screen resolution of 800x480 somehow doesn't inspire thoughts of honesty and quality.
Forum: Pentax K-1 09-22-2018, 04:02 AM  
Does Pentax K-Mount DA 18-270mm work well with Pentax K-1 Mark II
Posted By funktionsfrei
Replies: 11
Views: 1,098
The camera won't hinder you operating it in FF mode, but the image will be severely vignetted, so "cropping" to APS-C either in postprocessing or in-camera seems to be the most sensible solution.

You might gain a slightly larger image than APS-C, but not by much.

Besides, the optical quality of that lens won't be as good to do credit to the K-1.


Most zoom lenses degrade with high zoom factors, the 18-270 is a 15x zoom lens.


More "professional" zoom lenses don't use zoom factors above 3 or 4. The 70-200 range is 3x, the 28-105 is slightly below 4x.

It seems to be impossible to get a f/2.8 zoom with a zoom factor higher than 3.

There is a 10x zoom lens on the market which is some kind of an exception to the zoom factor/crap ratio, that is the "bigma", a 50-500 zoom, which in some markets can still be obtained in Pentax K lens mount. That one does perform decently on the K-1, and it even comes with an optical image stabilizer. Yes, that works with the K-1 (and all other SDM-capable Pentax bodies since the K10D).


More about the "bigma" can be found here Sigma 50-500mm F4.5-6.3 DG OS HSM Lens Reviews - Sigma Lenses - Pentax Lens Review Database
and here Sigma 50-500mm F4.5-6.3 APO OS HSM Review - Review | PentaxForums.com Reviews


Be careful if you obtain an older copy, since that lens is one of those likely to scratch the K-1's body. On newer copies, Sigma replaced the bayonet ring with an updated construction.

This lens will give you the most "bang for the buck", but it comes with some weight - it's slightly heavier than the HD Pentax-D FA 70-200/2.8
Forum: Pentax K-1 08-10-2018, 08:33 AM  
Lost all settings - unintended factory reset
Posted By funktionsfrei
Replies: 11
Views: 748
It's not done, but it would be nice if it were.
Forum: Pentax K-1 07-30-2018, 07:18 AM  
Would like some lens compatibility info please
Posted By funktionsfrei
Replies: 16
Views: 961
The question was about the 70-300, a completely different (and much slower) lens.

If uncertain, check the outer diameter of the lens' bayonet mount. It should not be larger than the corresponding K-1's bayonet mount.




HSM is Sigma's wording for SDM. That's the same, just different marketing buzzwords. Sigma's remark about compatibility refers to very old Pentax DSLRs, that is, those made befor the K10D (which introduced the necessary additional contacts in the lens mount).


With some few exceptions (as for instance the 70-200/2.8 boriscleto was referring to) those lenses do work without problems.

Sigma made a somewhat newer variant of your 70-300/4.5-5.6 that includes an optical stabilizer. That lens works fine with the K-1 and is small enough at the mount side not to scratch the K-1's body. Since your lens is quite closely related to that lens, it can be presumed that your lens will not cause scratching problems.

Be aware that the 70-300 comes from a time where Sigma had massive quality spread problems.


Two copies of the same lens will show massive different results, one copy may be perfect, the other one's lousy as a beer bottle.

My 70-300 with OS is one of the fortunate examples that are surprisingly good (especially given the laughable price this lens can be got in new condition - just 170 EUR), hopefully yours will be in the same range.
Forum: Pentax K-1 07-14-2018, 03:38 AM  
Pentax K-1 II vs K-1 autofocus test: results are in!
Posted By funktionsfrei
Replies: 28
Views: 2,094
An interesting addition would be a similar comparison of a K-1 with pre-1.50 firmware and a K-1 with 1.50 firmware, as there are some hints that the update might have improved things.

Lots of tedious work, I'm well aware ...
Forum: Pentax K-1 07-08-2018, 03:50 AM  
K-1 Viewfinder Information Display Panel
Posted By funktionsfrei
Replies: 25
Views: 1,463
I do wear glasses, but maybe we differ in our kind of visual impairment. Being short- or nearsighted is something completely different from being farsighted (that's the one that usual comes with age).

Could it be that the kind of glare you describe is being caused by your glasses? What happens if you use glasses with a non-reflective coating?

Besides that: Your idea of user-settable brightness for the LED backlight used for the viewfinder information sounds like a pretty good idea and should not be too difficult to implement.


The camera already dims the brightness in low-light situations, so the hardware is present. Just checked that with my K-1 -- the brightness dims noticeably when I darken the lens by placing a hand in front of it.


Wait a moment.


Have you noticed this specific behaviour (viewfinder information being to dim) just with your camera, or is that something you notice on other cameras too?

Were it the first case, it could be a defect, which in turn would explain that there haven't been many (if any) similar complaints to yours.
Forum: Pentax K-1 07-07-2018, 05:34 AM  
K-1 Viewfinder Information Display Panel
Posted By funktionsfrei
Replies: 25
Views: 1,463
Hmm. I'm using O-ME53 and don't have that problem.
Forum: Pentax K-1 07-04-2018, 11:58 AM  
Rear LCD in Liveview
Posted By funktionsfrei
Replies: 16
Views: 811
Maybe it's a scaling artifact.

What happens when you zoom in?
Forum: Pentax K-1 06-23-2018, 03:06 AM  
K-1 SD Card Hardware
Posted By funktionsfrei
Replies: 21
Views: 1,779
What leads you to this curious assumption? Are you talking about the camera's connection to a PC, thus using the camera as a card reader?

That's completely unrelated to the way the camera itself accesses the SD cards.


And, no, neither of the SD-card slots is an UHS-II slot. The slots are different, number 1 has two "double contact" springs instead of only single contact spring as numer 2, but this is a mere manufacturing difference, due to the different mechanical properties of the slots. Both might be mounted on the same PCB (printed circuit board), one lying flat on it's surface, the other one with long standoffs and longer "pins".

That's all.

Besides, the camera's write speed (which is limited by the speed the sensor can be read) is much lower than what a decent UHS-1 SD card can deliver.

That the sensor's the "bottleneck" here can be seen when comparing the frame rate achievable with a Nikon D810, which uses the same sensor.
Forum: Pentax K-1 06-13-2018, 01:53 AM  
K-1 Sensor Artculation
Posted By funktionsfrei
Replies: 39
Views: 1,563
You're obviously quite right, I was thinking a mite too complicated.

I'm afraid though, that the loss of infinity focus when tilting might still be a limitation, at least for some applications.
Forum: Pentax K-1 06-12-2018, 12:08 PM  
K-1 Sensor Artculation
Posted By funktionsfrei
Replies: 39
Views: 1,563
Yes, that would be possible, but somewhat complicated, and you'd lose the ability to focus to infinity with anything but the sensor's edges.

That's somewhat different to what optical bench cameras do. When they tilt the sensor (film, that is), they rotate it around a horizontal or vertical axis that runs through the sensor's centre, thus moving one half of the sensor back from the lens but the other half toward it. The axis of rotaion of the sensor remains in the focal plane.


Your concept would mean a rotation around one of the edges, thus moving the whole sensor back and only the edge around which the sensor is being rotated remaining in focal plane.


Interesting as the idea is, I'm afraid it would be somewhat complicated to achieve, because you'd have to implement four separate axes of rotation (lower/upper edge and left/right edge, though but one of each pair would be used for obvious reasons). That would add to the camera's depth, because all of this would have to happen behind the current plane of movement for the sensor (towards the photographer), thus making the camera even deeper (or fatter) than the K-1 already is.

But having the sensor tilt through the focal plane shutter would also be highly complicated and critical, beginning that the aperture of the shutter would have to be much larger than the usual 24x36mm to accomodate the sensor's outer dimensions ...


That doesn't seem feasible either.

Another approach would be tilting the combined shutter/sensor assembly, here the severest constraint would be the mirror's mechanics which would impede the sensors upper edges' movement towards the lens. That problem might be solved by increasing the dimensions of the mirror box. With such a construction, I doubt that it would be possible to use the tilt mechanism for image stabilization (due to the severely increased mass by adding the shutter) and ... I'm afraid that the resulting camera would be somewhat in the dimensions of the Pentax 67. Good to throw at a stampeding elephant herd ...

Maybe sensor tilt would be something where those evil mirrorless cameras are definitively at an advantage.

Until then, I just use my Samyang 24TS.
Forum: Pentax K-1 06-12-2018, 11:04 AM  
K-1 Sensor Artculation
Posted By funktionsfrei
Replies: 39
Views: 1,563
A tilting sensor would rather likely collide with the focal plane shutter and the mirror mechanism which are integral parts of a SLR.

It would be possible if used only in LV mode with full electronic shutter.
Forum: Pentax K-1 06-11-2018, 03:12 AM  
K-1 Sensor Artculation
Posted By funktionsfrei
Replies: 39
Views: 1,563
Interesting in that aspect is how they manage to achieve "5-axis stabilization" with only three axes of movement for the sensor ...
Forum: Pentax K-1 06-11-2018, 03:06 AM  
Does anyone know if K-1 will get any more firmware updates?
Posted By funktionsfrei
Replies: 40
Views: 2,199
There is an exception - in retrofit, they've equipped several older cameras with support for the KAF4 protocol (to be abled to use the 55-300 PLM lens with electrically controlled aperture). That goes as far back as the K-3.
K-3 firmware update: KAF4 mount support - PentaxForums.com
Forum: Pentax K-1 05-25-2018, 02:37 AM  
The CameraVille image quality comparison K-1 vs K-1 MKII
Posted By funktionsfrei
Replies: 30
Views: 3,882
So, the major difference is a sligthly different AWB and ... the MK II's image being slightly more blurry (compare the texture on the two armchairs in, say the ISO6400 comparison shots).



And the strange violet tinge the MKII shows in the low-light dynamic range tests.


Maybe Lee should have used a fixed WB preset instead of AWB?


I've stopped using AWB 'bout 15 years ago. Never missed it since.


And I've yet to find a reason to shell out more than 500 bucks to "upgrade" my K-1. No, I'm definitively not impressed.
Forum: Pentax K-1 03-24-2018, 01:05 PM  
Lens corrections-In camera or in Lightroom
Posted By funktionsfrei
Replies: 13
Views: 1,210
Well, in-camera lens correction works for just the few lenses that come with embedded lens correction profiles.

For the majority of lenses out there, that won't help.

LR on the other hand uses lens correction profiles you can create yourself, using the lens profile generator. You have to print a specific test target and take a certain amount of images of that target with the lens you want to profile.

The result is an individual profile of the individual lens you've used, not a generic one-size-fits-all profile that is incapable of compensating for variations across individual copies of lenses.

Thus such a profile is to be preferred to the profiles that come with LR, given, of course, that you've been meticulous when creating the profile.
Forum: Pentax K-1 03-22-2018, 12:31 PM  
rokinon lenses scratching k1?
Posted By funktionsfrei
Replies: 14
Views: 816
There is a quite prominent groove which has been present from the first day on.

This groove is slightly below the white LED that illuminates the lens.

But neither this groove nor the sigma-related scratches are in any way part of the problem with that specific lens here.
Forum: Pentax K-1 03-22-2018, 05:03 AM  
rokinon lenses scratching k1?
Posted By funktionsfrei
Replies: 14
Views: 816
If the aforementioned lens looks like this one here

it's extremely unlikely that it creates the same problems as some Sigma lenses did.

The diameter of the bayonet mount is far to small for that to happen. It's not larger than on original Pentax lenses.

Image Source: https://www.pentaxforums.com/forums/36-sold-items/247807-sale-sold-rokinon-8...tax-mount.html
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