Forgot Password
Pentax Camera Forums Home
 
Log in or register to remove ads.

Showing results 1 to 25 of 84 Search: Liked Posts
Forum: Pentax Full Frame 1 Day Ago  
A Pentax fullframe DSLR I want to see (and have)
Posted By Henrico
Replies: 59
Views: 3,188
Skipping the shake reduction mechanism for sure saves space. With the nowadays low noise at high ISO, shake reduction is less valuable than it was 20 years ago. That might be a step in the direction of a ME-super era compact DSLR. Back to basics, just exchanging the film compartment for a FF sensor.
Forum: Troubleshooting and Beginner Help 04-03-2024, 01:50 AM  
Help with cleaning/disassembly of SMC A 100mm f2.8 lens
Posted By Henrico
Replies: 15
Views: 583
I think the freed unit contains the three front lenses of this A100. Try to unscrew the metal ring around the front element, maybe you get access from that side of the block and not from behind.

I never had a glued part in these metal/glass era Pentax lenses, everything is based on screws and screwing. It might have been a little corroded in a humid environment.
Forum: Troubleshooting and Beginner Help 03-30-2024, 01:56 AM  
Help with cleaning/disassembly of SMC A 100mm f2.8 lens
Posted By Henrico
Replies: 15
Views: 583
Last week I fixed a wobbling filter ring of my K1.2/50. The lens itself was OK, only the front metal tube with filter ring hung on only one screw (instead of three).

This Youtube video explained how to get to these three screws:














You Tube




The front part of the focusing ring (with the rubber on it) is a screw mechanism itself, so you can unscrew it what gives the space to the three tiny screws that hold the front metal tube.

Maybe the same is the situation at yours. By unscrewing the front tube you might find a solution to get to the front lenses.

Lenses that I cleaned from fungus became bright and clear only by using pure ethanol. Just buy cheap "bio ethanol" used for fire heaters, drop the affected elements in it for a while and weep them dry with a clean cotton handkerchief.

Btw, I own the K100 predecessor of this A-lens. These were optical and ecstatic jewels in the times they were produced. Even now these are tack sharp stopped down a bit on my K1ii. I hope you can fix it.

I wish you good luck!
Forum: Pentax K-3 III Monochrome 03-19-2024, 03:25 AM  
K3iii monochrome with winning design
Posted By Henrico
Replies: 17
Views: 1,070
Every sign of life is a light of hope....
Forum: Pentax Price Watch 03-15-2024, 11:37 PM  
Pentax A*1200mm F8 ED[IF]
Posted By Henrico
Replies: 1
Views: 530
Yes, you don't see these often. Difficult to use, not a lens for birds in fly... But nice to own, it is a great piece of engineering. Only looking at it is very satisfying.
Forum: Pentax Full Frame 03-09-2024, 02:42 PM  
A Pentax fullframe DSLR I want to see (and have)
Posted By Henrico
Replies: 59
Views: 3,188
I would be happy with a FF digital Super-A, so no AF at all, no SR, no video, no rear screen, just a robust basic digital K-mount camera for all those M42/K/M/A lenses with a physical aperture coupling and a 36 Mp sensor in it. I adore the bright viewfinder with the split screen inside, so much better than DSLR's. That's the only way to keep it compact. Use your smartphone to view your shots with a cable or WiFi. In case Ricoh offer that for € 1500 I'm in.
Forum: Pentax SLR Lens Discussion 03-05-2024, 11:00 PM  
Rokinon 14mm - how bad is it decentered?
Posted By Henrico
Replies: 16
Views: 707
Not bad at all I would say. The differences are very small and the corner performance wide open is really good for a low budget lens. This lens also shows almost no abberations in the far corners, which is remarkable. Only minus is the charasteristic "moustache" distortion visible on architecture shots like yours. And these Rokinons are famous for their totally off of the distance scale on the lens, you can adjust and calibrate the infinity however.
So enjoy your super wide angle, it is a difficult but very nice lens for the little money payed.
Forum: Pentax Price Watch 02-27-2024, 01:40 AM  
Great Price On "Like New" Pentax K-1" Camera Body
Posted By Henrico
Replies: 8
Views: 731
The K1 is still a machine to produce great 36 Mp pics and is build to last long. The low pricing might be an indication how the already rapidly shrinking (non-smartphone) imaging market shifts to MILC. I choose to stay in Pentax, for my photography it makes no sense to invest heavy in Nikon Z8 or so, as long as I can buy 2nd hand K1 body's for prices like this I can continue the rest of my life in what I am doing.

But it also shows the dilemma of Ricoh to launch successors. Their potential market for buyers of a new designed 3K€ K1iii is so small nowadays that they can't make a profitable business case anymore. Such a new camera is not 3-4 times better than whats now offered "like new" on the 2nd hands market. It is more likely they will do the K70 => KF trick in case they are running out of components. And even that will be OK for me.

I do not expect any revolutionary launches of Pentax gear anymore. Let's first wait for what they bring with film, and how that will be received in the Pentax community. For Ricoh I hope it will not be a disappointment.
Forum: Pentax K-01 02-02-2024, 07:27 AM  
K-01 with stuck shutter fires again like a machine gun...
Posted By Henrico
Replies: 5
Views: 693
Amazing, three years ago my K-01 died with a stuck shutter. Whatever I tried, nothing helped.

I didn't hold it in my hands for more than a year, and today I loaded it with a fresh original 7.2 V D-LI90 (measured voltage 8.3 V) but unfortunately the shutter stuck is still there. Menus and everything work fine, only the shutter remains blocked.

So in a final attempt I got the idea it maybe needs some more voltage. Accepting the risk to electrocute it I wired a 12V lead battery on the plus and min connector in the camera battery compartment and guess what..., it lives up like it is new. I tried continuous shooting and it fires like a machine gun, everything works fine as intended!

When I load after this shock therapy the original battery in the camera it fires a few shots and then the shutter stuck appears again. So it is not the electric shock but a more structural power shortcoming, not enough voltage available to run the shutter mechanism.

Maybe this is an opportunity for a fix. My K-01 seems not dead, it is only in a deep sleep... Is there anyone here among us who brings this to new ideas to make K-01's alive again? That would be great!

Cheers..
Forum: Pentax DSLR Discussion 01-23-2024, 06:44 AM  
Comparison KP+K200mm/F4 at F8 vs K1ii+K300mm/F4 at F11
Posted By Henrico
Replies: 10
Views: 1,527
On this perfect winter day I was curious what the differences are between these equivalent combo's. At this settings they offer the same FoV and the same DoF. The K1 combo weights 2030 g, the KP only 1250 g. Original file size 36 Mp vs 24 Mp.

Crops are done from the same original RAW file with no sharpening. So no artifacts, just real of-sensor IQ. Crop size was 6000 x 4000.

Both shots taken at ISO 400, 12 seconds timer, steady tripod, focused precise with magnified live view, manual WB (daylight) and non-sharpened RAW. The object opposite my house is about 50 meters away. It was cold sunny clear windy weather, low humidity, no atmospheric aberrations. So everything perfect for a good comparison. The 200 is best at F8, the 300 at F11, better sharpness than this is not possible in my opinion.

Key question; for long tele shots, is the extra weight (and money) worth the differences in IQ?

My observations: The 200 surprises a lot, a very sharp lens. The 300-combo delivers cleaner results because the better sensor in the K1ii at 400 ISO. Maybe also the RAW-baking is a bit present here, I'm not sure at this ISO. But the pictures are not sharper, the KP-combo is a bit sharper but also a bit noisier (smaller pixels).

As long as the sensor outperforms the lens, does it make sense to invest in longer glass? Old lens tests showed that longer lenses often had lower lines/mm sharpness. So extra length was profitable as long as the lenses did outperform the (often high-ISO) film. With nowadays low noise high pixel density sensors things changed in that perspective.

I think I better leave my K1ii/300 at home and grab the smaller combo. What's your opinion about this?





















Forum: Pentax DSLR Discussion 01-23-2024, 11:38 AM  
Comparison KP+K200mm/F4 at F8 vs K1ii+K300mm/F4 at F11
Posted By Henrico
Replies: 10
Views: 1,527
A few years ago I tested the K300 / KP on the same object, you can find it at the Lens Review Database page: SMC Pentax 300mm F4 Reviews - K Prime Lenses - Pentax Lens Reviews & Lens Database

And also the A400: SMC Pentax-A 400mm F5.6 Reviews - A Prime Lenses - Pentax Lens Reviews & Lens Database

And finally the Tokina RMC 400: Tokina ( Hoya )RMC / SL 400mm F5.6 Lens Reviews - Tokina Lenses - Pentax Lens Review Database

All four lenses (200, 300, 400, 400) produce a similar result for sharpness zoomed in (cropped). So my suggestion now is that all these non-ED lenses are outperformed by the sensor and it makes little sense to go longer than 200 mm because cropping on a modern APS-C sensor deliver similar results.

Just curious about the even longer glass...













Forum: Pentax SLR Lens Discussion 01-18-2024, 11:49 AM  
Pentax M lens coatings
Posted By Henrico
Replies: 16
Views: 858
I once disassembled a K24mm F2.8 that suffered lens separation, in fact the M24 that never came. I tried to separate the twin elements with different solvents (pure ethanol, propanol, white spirit, acetone) without success. Finally I tried to split them in heated oil (100 °C). Nothing worked.

To my surprise when I cleaned the elements after the oil dip with ethanol I noticed that that the characteristic colors of the multi coatings still were there. The coatings seem indestructible. So your biggest issue is to loose the screws. That might be a real problem.
Forum: Film Processing, Scanning, and Darkroom 01-14-2024, 07:18 AM  
Negative scanning
Posted By Henrico
Replies: 120
Views: 4,996
I have to say it was difficult for me to find old LS50 scans (Coolscan-V) that showed the ghosting problem that I could remember. More than 98% of the scans were top class, without ghosting.

The ghosting appears more pronounced on slides than on negatives due to the high contrasts. The photos below show the (marginal) difference between the Coolscan-V and the K1ii scan I did today.

So, in terms of IQ, there is little to no reason to choose a K1 scan over a Coolscan-V. But the Coolscan became unemployed 15 years ago, so I decided to sell it (for the price I paid for it new at the time). My K1ii / DFA-100 combo is working fine for now. I rarely take photographs with film anymore.
Forum: Troubleshooting and Beginner Help 01-08-2024, 04:29 AM  
Manual focus through OVF on a dslr (K1ii)
Posted By Henrico
Replies: 35
Views: 1,508
As far as I understand the issue of not pinpointing manual focus through the OVF has nothing to do with the AF mechanism or your inner focusing screen itself. The AF beam goes through the partially transparent mirror to the sensors, it does not use the focusing screen at all.

One issue is because of the transparency of the mirror, what makes the viewfinder less bright, for sure compared with those of the ME-super era cameras. Second issue is that the tolerance for what is in focus differs between a 36 MP sensor and an old film roll in the 70's. The DOF-scales on old manual lenses are too wide on modern sensors for that also. Third issue is that the distance between lens and focus point on the sensor compared to the mirrored focus point on the screen has tolerances too, it is not 100% accurate.

I noticed on several (d)slr cameras (also the old manual ones) that using 1.2 and 1.4 apertures were absolute sharp through the OVF, but were just off in real. And then systematical back focused or front focused. You only can correct that by adjusting the mirror or the focussing screen. It is the Achilles heel of an OVF-camera.

For long I used my K-01 with a Hoodman-pro glued on the back screen, in fact an EVF-K-01. With wide apertures and/or tele lenses manual focusing always was spot on, for sure when I used the digital magnify function button.

So the problem is not your eyes but the tolerances of the optical paths in an OVF-DSLR.
Forum: Film Processing, Scanning, and Darkroom 01-01-2024, 02:23 PM  
Negative scanning
Posted By Henrico
Replies: 120
Views: 4,996
I scanned thousands of negatives with a Coolscan V (4000 dpi) and Silverfast with great results. I worked from >100 Mb TIFF full resolution to an approximately 5 Mb JPG. Good film ended up in 3000 x 4500, average film to 2400 x 3600. When years later all my slides and negatives were digitized I sold my Nikon for the price I bought it new (yes, Coolscans were / still are very looked after after all these years) but I missed the fun of scanning. I have a stock of nice Ektar 100 rolls and sometimes I find some old negatives that need to be digitized. So I made a setup with my K-01 / M 100/F4 with great results. Nowadays I use my K1ii / DFA 100/2.8 macro for it and that even works better.

My workflow can be found here: My best methodology for film scanning with RAW-camera - PentaxForums.com

What can I say:

The Coolscan is slow but delivers clean scans with the ICE automatic dust and scratches removement. Though, in extreme highlights/shadows it shows ghosting in the shadows from the highlights. But most scans were fine on my screen and far better than the original color prints.

The K-01 - M100/4 setup delivered decent scans, and the workflow in PS from RAW to JPG I developed still works fine. Only the manual dust & scratches re movement takes some time with old negatives. When you nail the focus this combo was even sharper then my Coolscan was. When you catch all the RGB color info of the negative (also the low flat levels in the RGB-histogram) you will be surprised about the large dynamic range available in negatives. A final resolution of 4500 / 3000 (13,5 Mp) worked best for me with good film.

Last years I do the same, but with a K1ii / DFA 100/2.8 setup. I manually sharpen at 2.8 and shoot at F11 for the best results. Scans are now even more detailed than with the K-01 setup. I end up in 6000 / 4000 (24 Mp) JPG's from 6-8 Mb. Old shots on good film (Ektar 25, Ektar 125, Kodak Gold 100 or Superia 100), taken decades ago with my ME-super and lenses like M50/1.4 at F4-F5.6 covered with a hood, really surprise me for how sharp these can be.
Forum: Film SLRs and Compact Film Cameras 11-29-2023, 01:57 AM  
Too many SLRs, what to keep?
Posted By Henrico
Replies: 56
Views: 1,864
Keep them all, cameras don't eat bread and nowadays these are worth almost nothing.
Forum: Pentax K-1 & K-1 II 12-11-2023, 07:23 AM  
Will the K1 track the sun?
Posted By Henrico
Replies: 20
Views: 1,375
Interesting question, stars rotate around the axis of the earth, the earth also rotates around the sun. I think Astrotracer will not correct on that.

In case you try, use a very very dense gray-filter, if not you will burn a hole in your sensor...
Forum: Pentax DSLR Discussion 10-04-2023, 01:37 PM  
Pentax K-5 Solenoid Problem?
Posted By Henrico
Replies: 8
Views: 907
All Pentax DSLR bodies with a stepper motor (typical bulge right besides the bayonet mount) for aperture control don't suffer the aperture block failure. So the K7, K5, K3, KP, K1 and even the K-01 are very reliable in that aspect.

The K-01 is prone for another failure, the shutter stuck failure. That might be caused by solenoids also, but those in the shutter mechanism.
Forum: Pentax SLR Lens Discussion 08-29-2023, 01:40 AM  
Help me decide between two long lenses
Posted By Henrico
Replies: 39
Views: 1,897
Try to find a good A400 F5.6. Performs very well on the K1 and is in between of the two lenses you mention.
Forum: Film Processing, Scanning, and Darkroom 05-26-2019, 01:02 PM  
My best methodology for film scanning with RAW-camera
Posted By Henrico
Replies: 36
Views: 12,022
Ten years ago I started digitizing all my family prints, negatives and slides. For my prints that lacked the original film material, I used an Epson flatbed scanner, I cropped the photo's of the scan files with Photoshop and developed these to decent JPEGs. For all my thousands of negatives and slides I found a flat bed scanner disappointing, scanning is a lot of work and I choose to do it the best way possible. So I bought at ScanDig a brand new Nikon Coolscan V for € 900,- with SilverFast software to achieve what I had in mind. Nikon then already had stopped producing its scanners and prices were already getting higher and higher. In four years I scanned all my film material that I always had stored well organized, and I developed fine skills how to do that from 120 Mb TIFF files to decent 3-5 Mb JPEGS. The workflow started with Silverfast and was finished with Photoshop. During a scan (2-3 minutes) I did the digital processing of the former TIFF so there was no time lost. About two evenings a week I processed one complete film each. Four years later all my material was digitized, and stored in clouds, DVD's and hard disks and I used my Coolscan so seldom I decided to sell it. Buying, and not renting one had been a good decision, Coolscans were very looked after and I sold it for more than I bought it new...


But sometimes I still shoot film (Kodak Ektar) on my K2 and ME-super, just for fun, and my friends and family also know my skills on scanning... So I experienced how I could digitize these with my K-01. I found some info on the internet, but scanning color negative this way is pretty delicate to do. Choices for the best light source, blue filtering to neutralizethe red cast, white balance etc. resulted in a steep learning curve and I am happy now I found the right way to do it. The results are similar or even better than I achieved with my Coolscan, the digitizing itself goes rapidly fast, but the post processing takes more time, most for healing dusts and scratches. The advantage of the Coolscan is its Digital ICE; the pre-infrared scanning to identify dusts an scratches and repair this automatically with the Nikon software.

For anyone who wants to digitize its films I would like to share my experiences on how to do this in the right way. I only explain the procedure for color negative. Slide and B&W are rather easy to do if you own the skills for doing color negative. First of all; all the color information of your photo is captured in a narrow color space, so you must shoot RAW (16-bits) and develop in 16-bits. At the end you shrink to 8-bits and JPEG. My experience is that there is not more information on 35 mm film material than 10-12 Mpix, the resulting format is 3600x2400 or max 4500x3000. In my childhood I used to play with FisherTechnik. I still own it, now waiting for grandchildren, and I created a lay up with it for my scanning procedure. You can grab it for little on Marketplace here. The best light source is a larger Philips LED Bulb (18,5W 2700K), it offers equal warm white light and gets not too hot for the paper cilinder cover I use and the film itself. The light spectrum fits good with the color layers in the film and the RGB pixels on the sensor. I tried cooler light, blue filtering, tungsten light, but 2700 K LED is OK for the job.

I shoot RAW, the coolest possible manual White Balance (see picture below). Lens mounted is a 100 mm Macro (first M, later DFA, both are very good) at F8 or F11, ISO 100 and 1/500 - 1/1000. Nail the focus wide open on the grain in the film and be aware the whole spectrum in the film is covered in the histogram. I shoot with 2 sec timedelay to avoid any shaking, this is working good. Be aware of clean film strips and take care during the shootings.



For the workflow of digitizing I use Photoshop / Camera RAW. Now the magic begins... Screenshots of how it works are shown below.

Upload the RAW file to your computer, open it in Camera RAW. I use CS5 by the way...
  • Crop the 3:2 frame, the histogram info shows just the info inside the cropped frame

  • Put the Temperature on 2000 K, Recovery on zero, Fill Light on zero, Brightness on zero, Contrast on 50

  • Now shift the "Tint" slider to the position that the blue channel in the histogram will be covered behind the other colors. Most that's nearby zero position. In fact you are compressing the histogram.

  • Finally adjust the "exposure" slider so the histogram expands to the rightside, and adjust the "blacks" slider to expands the histogram to the left side. What we are doing here is to expand the histogram as far as possible to get all the available information in full 16 bits color depth.

  • I always do some sharping in Camera RAW: Sharpness 50/1.0/2.5/0 , Color NR is 25 and Detail 50.

  • Now press on "Open Image", the 16-bits file will be loaded in Photoshop.

  • First thing I do is cropping it: 45cm x 30cm at 100 pix/cm, this results in a 4500 x 3000 pixels file.

  • To reduce digital noise and grain, choose Filter / Noise / Despeckle. This halves your file size without losing real sharpness.

  • Now invert your picture to positive; Image / Adjustments / Invert.

  • With the Levels menu you can make a brilliant picture of it; Image / Adjustments / Levels.
    • Expand for each color the histogram to full width (see screenshots) and press OK.

    • After that, tweak to good color balance by adjusting the central sliders for each color in the same histograms.

    • Not satisfied? Try to adjust the output levels under the histogram for each color, for instance, with the high Output Red you can cool a sky that is coloring toored. Press OK.

    • PS-experts; there are many more controls for the best results, I leave it here to the basics.


  • Now try "Auto Levels" and "Auto Color", sometimes this is the finishing touch, sometimes it worsens your result, then you undo it easily.

  • Finally pimp your result with some "contrast" and/or "vibrance" in your adjustments menu.

  • Remove dust, scratches and unwanted feet... with the healing brush tool in PS.

  • Now reduce by Image / Mode to 8-bits and save as a JPEG-file level 10.

First picture is the old original Coolscan-file, second one the recent result as described here. The Coolscan file is a bit cleaner due to the ICE-mode, the K-01 scan is more crisp and shows no halos. The Coolscans sometimes does show linear halos (line-sensor) near clipping contrasty areas. When you get used to this procedure, and you own some PS-skills, scanning with a RAW camera really goes fast. Most work is caused by restoration of damaged film and dirty sensors. Because you are expanding the dynamic range so much and use small lens opening, you will see every anomaly in blue skies etc.

My youngest son's face is expanded to 100% to see the difference, the left one is K-01 scan, the right one the original Coolscan. The boy has grown now over 1.90 meters...

I hope this is helpful and useful for you, please reply your improvements, I am still in a learningcurve... Thnx!

Coolscan first, K-01 scan second:

























Forum: Pentax SLR Lens Discussion 07-01-2023, 01:06 AM  
Help me Buy a Wide Angle Lens
Posted By Henrico
Replies: 33
Views: 1,673
Personally I would not put an M-Lens on a K-series film camera. If you can find a 30 mm lens you get a unique combination. The differences in IQ are more pronounced on digital than on film. I would never invest $800 for a Hollywood 2/28 for putting it on a K1000. The 30mm is a good lens, 2.8 is fine and all mentionned lenses at 5.6-8 will deliver similar very good results.
Forum: Pentax SLR Lens Discussion 05-29-2022, 07:43 AM  
SMC Pentax-M 28mm f2.8 disassmbly for cleaning
Posted By Henrico
Replies: 16
Views: 2,081
If it not there factory wise, light beams will not touch the glass borders, you can leave it as it is.
Forum: Pentax SLR Lens Discussion 05-29-2022, 01:35 AM  
SMC Pentax-M 28mm f2.8 disassmbly for cleaning
Posted By Henrico
Replies: 16
Views: 2,081
The black paint is to reduce internal scattering in the glass itself. That paint does not survive solvents. I used a black permanent marker pen to fix that.
Forum: Pentax SLR Lens Discussion 05-28-2022, 11:23 AM  
SMC Pentax-M 28mm f2.8 disassmbly for cleaning
Posted By Henrico
Replies: 16
Views: 2,081
The lens elements in the M28 are very small. Cleaning them with a cotton handkerchief and pure ethanol often does the job. Cleaned this is a fine lens on APS-C. Compact and pretty sharp stopped down a bit. Good luck!
Forum: Pentax SLR Lens Discussion 04-19-2023, 02:04 PM  
APS-C pancake
Posted By Henrico
Replies: 55
Views: 2,620
Consider a pristine M 28/2.8 lens, yes MF. It performs great on an APS-C body and is very small. The M28 has weak borders and corners on FF, but on APS-C only the hot spot is used and it works great one stop down.
Search took 0.01 seconds | Showing results 1 to 25 of 84

 
Forum Jump


All times are GMT -7. The time now is 09:58 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top