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Forum: Troubleshooting and Beginner Help 14 Hours Ago  
Diaphragm blades stopped working - Pentacon auto 2.8 29mm
Posted By Bob 256
Replies: 6
Views: 224
Ordinarily, pushing the camera meter button will close down the lens for metering (by depressing that small pin while you're metering) and the aperture ring will control the aperture during that time. Otherwise you wouldn't expect the diaphragm to close, even using the f-stop ring unless it is in manual (if it has a manual mode). If you take the lens off your camera and push the pin, the aperture should close to what you have set on the aperture ring, so what you described sound's like normal operation. Can you see the image darken through the viewfinder (assuming your camera is an SLR) while you meter? It may be that your metering battery is dead, hence the indicator not moving.
Forum: Pentax K-3 III 19 Hours Ago  
Lack of detail or contrast or.... something.
Posted By Bob 256
Replies: 12
Views: 586
Can you take a couple of comparison shots using Liveview critical focusing (magnification if possible) in manual focus mode? That would allow you to eliminate camera sensors as the source of the softness. It just might be the AF systems in the cameras differ in the way they focus and there could be some issues with the AF systems. Also, the fact that the shots are handheld might implicate shutter speed as a culprit. To get really sharp up-close photos usually requires a tripod (and careful focusing) as well as a good shutter speed if the subject is moving (even slightly). If you're using a larger aperture, focusing becomes more important because the depth of field decreases and overall lens sharpness can decrease at the largest apertures. I'm just throwing out some things to consider.
Forum: Troubleshooting and Beginner Help 1 Day Ago  
K1mkII firmware update problem
Posted By Bob 256
Replies: 13
Views: 525
Best to use a clean card (nothing else on it) for updates. Format the card before writing the BIN file to it, follow the instructions luftfluss provided to the letter, and you should be a happy Pentaxian.
Forum: Canon, Nikon, Sony, and Other Camera Brands 5 Days Ago  
weird artifacts photographing an airport beacon
Posted By Bob 256
Replies: 7
Views: 284
Looks really cool!

Might be something buried in the blacks of the individual images and when stacked caused the interference type pattern. Try lifting the blacks of a single exposure using curves and see if anything is there that's hidden in the darker sky. As said, it probably originated with the rolling shutter (ES) and maybe LED type light sources in the tower, exhibiting some kind of flicker that you wouldn't see visually. Stacked, the subtle unseen patterns could then create the "interference" pattern of the resulting photo.

Did I say, looks really cool?
Forum: Pentax News and Rumors 5 Days Ago  
New firmware for K-1 and K-3 Mark III
Posted By Bob 256
Replies: 30
Views: 3,535
Looks good. Hope that feature to display the FUYUNO menu screen is a selectable feature. It might be a pain if it comes up every time a lens is switched although I assume it will disappear as soon as the shutter button is pressed half-way or some such thing. I too, would like to see some focus stacking ("focus bracketing") features offered in the future. Several cameras have incorporated this feature in newer models. Kudos to Ricoh.
Forum: Film SLRs and Compact Film Cameras 6 Days Ago  
Off camera flash/strobe light for Pentax k1000?
Posted By Bob 256
Replies: 8
Views: 341
Ditto on CristiC's recommendation. I have the Pentax version of the R2 Pro Mark II and like it well. Good range, flexible, and reasonable prices.

More info (Nikon version shown) here:!
Forum: Pentax K-1 & K-1 II 11-29-2022, 02:38 PM  
K-1 II Problem - Help
Posted By Bob 256
Replies: 7
Views: 534
There's also a small button just above and to the right of the 4-way pad (the 1-2 button). Pressing this will lock out the 4-way pad (mode-wise) and place the camera in selective AF where you can choose the spot in the optical VF which the AF will use. That can still give you grief if the 4-way is accidentally bumped but it will only throw off the AF sample location and not affect major things as in your case. Early on, I found out about this issue when my camera suddenly began taking shots seconds after I pushed the shutter release. Only later did I find out that the camera had switched to the 12 second delay mode (good for self-portraits but not good when you're shooting action).:)

The same button also selects which SD card you see on the LCD screen in review mode (when you have two cards).
Forum: Troubleshooting and Beginner Help 11-29-2022, 10:55 AM  
SMC Pentax-FA* 80-200mm F2.8 ED [IF] Alternative Lens Hood
Posted By Bob 256
Replies: 5
Views: 478
The idea of the "petal" type is to provide cutouts in those areas that might be subject to vignetting (diagonals of the lens frame) and makes sense on some wide angle type lenses, but for an 80-200mm lens (a telephoto lens), chances are that the regular hood will not vignette any of the image, so it's actually better than the petal type and provides more side-light protection to the front element.
Forum: Photographic Industry and Professionals 11-28-2022, 08:24 AM  
Canon is pulling out of the low end
Posted By Bob 256
Replies: 30
Views: 1,389
Plastic has its positives and negatives. When I first started 3D printing, I didn't take the final products seriously but have since made lens mounts that I would trust in most cases. High temperatures are the failing of 3D printed plastics where they soften and can deform, but there are thermoplastics out there that can take all kinds of high heat and hold up pretty well to wear (though they aren't applicable to 3D printing). Personally, I think I would shy away from plastic lenses (though I have one in my collection with no regrets to date), but if a good optically performing lens came out in a plastic mount, I wouldn't necessarily look the other way. Same applies for camera bodies.
Forum: Welcomes and Introductions 11-28-2022, 08:15 AM  
Long time Pentax user. New member of the forum.
Posted By Bob 256
Replies: 14
Views: 231
Welcome fro Idaho. Excellent photo - hope to see more!
Forum: Film SLRs and Compact Film Cameras 11-28-2022, 08:12 AM  
Half-frame Pentax Spotmatic SP1000, any info on these cameras?
Posted By Bob 256
Replies: 10
Views: 482
Reminds me of something from way back that only does portrait format ................. my cell phone.:) Really neat modification to the camera and a film saver too boot. Did it come with a 25mm lens?
Forum: Digital Processing, Software, and Printing 11-27-2022, 01:10 PM  
Upgraded to AFFINITY PHOTO Version 2?
Posted By Bob 256
Replies: 12
Views: 790
Usually, this is something you have to talk to the card issuer about. If your card is one of the major ones, there should be a number on the back of the card and they can usually work out any issues. If the card is declined at the card level, there is little the bank or the vendor can do about it. Suspicious looking purchases can often trigger a card being declined but a phone call to the issuing company can usually fix it if it's a ligit purchase once they have the name of the vendor.
Forum: Pentax SLR Lens Discussion 11-27-2022, 12:56 PM  
Need a 24mm prime lens. Any recommendations?
Posted By Bob 256
Replies: 26
Views: 965
Would you consider a zoom which covers the focal length you're after or are you definitely after a prime? Some WA zooms are pretty sharp these days and since you're using film, may be as good as a prime for your use, plus you get the extra focal lengths such a lens would provide.
Forum: Flashes, Lighting, and Studio 11-25-2022, 03:26 PM  
Take better photos with a Raspberry Pi Pico light meter
Posted By Bob 256
Replies: 3
Views: 527
A bit of a modification of this and you can use the same for an enlarger meter if you're still doing the paper thing in the dark. Good application for the Pi but be sure to go with the pico since all the horsepower in a regular full blown Pi isn't needed (and the pico is a LOT cheaper).
Forum: General Photography 11-20-2022, 10:26 PM  
Modification to vacuum cleaner for sensor cleaning.
Posted By Bob 256
Replies: 47
Views: 1,941
When you pull air from an area (or volume to be more correct), air (and dust) from other areas have to flow in to replace it. Your vacuum device can also be drawn into contact with the optics or draw them into contact with it if you get too close to them. On the other hand, if you're using clean air under positive pressure, it displaces particles and fills the void with clean air. Too much pressure is all you need to worry about. Best as Mark suggested, staying away from vacuum devices.
Forum: Pentax Price Watch 11-19-2022, 04:55 PM  
Domke 19" red gear wrap - $15 (40% off) Amazon US
Posted By Bob 256
Replies: 3
Views: 207
The pricing is color specific. Blue appears to be the best priced, but good value regardless of color. Thanks for the tip.
Forum: Film Processing, Scanning, and Darkroom 11-19-2022, 11:18 AM  
Dirty Photo
Posted By Bob 256
Replies: 2
Views: 462
Here's a bit dated but very interesting YouTube on creating a photo print by using "dirt". The title caught my attention and I found the video pretty fascinating with a good example of the product creation and some real art skills. The video basically covers a gum print process but a full color one using unique pigments, the process being reminiscent of the dye-transfer process used way back. Sound's like this is the type of process to use if you want to make color photo prints to leave for your grand kids and their grand kids, and their grand kids, and................................:)

You Tube

Forum: Photographic Technique 11-19-2022, 09:21 AM  
Mirror Lens Depth of Field
Posted By Bob 256
Replies: 27
Views: 730
Many mirror lenses use movement of the barrel and thus the secondary mirror relative to the main mirror as the focus mechanism, which makes it very sensitive and may result in hard focusing if the helical isn't fine enough. The depth of field is small for most also, since you're dealing with long focal lengths and that accentuates any focusing errors. A refractive lens, on the other hand, effectively [I say "effectively" because some move internal elements and not the entire lens] moves the entire lens relative to the film plane which is a less sensitive focusing method compared to that of changing main-mirror/secondary-mirror spacing. It's possible to build a mirror lens with smooth focusing but to cut costs, that often isn't done. One other thing which might come into play is the bokeh of a mirror lens, which causes points of light to break up into more noticeable "donuts" or circles of light when out of focus, making out of focus details more pronounced. Mirror lenses are also working at maximum aperture all the time so compared to refractive lenses which can be stopped down, they might have a DOF disadvantage in that sense.
Forum: General Photography 11-19-2022, 09:05 AM  
Phone Camera for Wedding Photography?
Posted By Bob 256
Replies: 17
Views: 619
Many phones use digital zoom and a fixed lens (some have several fixed lenses). Their photos can look really great if "zoom" isn't used but in weddings, a good zoom lens is very useful and the image resolution stays high even when zoomed in to the action. Not so with those pocket wonders (and the user may not know that until they look at the result up close or try for an enlargement). Phones are made for taking photos that will be looked at on phones - not art prints or keepsakes.:)
Forum: Pentax SLR Lens Discussion 11-18-2022, 09:44 PM  
Please rate and comment upon my Pentax Collection
Posted By Bob 256
Replies: 89
Views: 2,281
The 12mm Rokinon fisheye (12mm full-frame; APS-C version is the 8mm though tad slower max aperture-wise) is a nice addition. It's not a traditional fisheye, and has a stereographic projection which creates less warpage in the image. De-fished, it is a really wide lens (considerably wider than the 15mm). Great for astro and landscapes.
Forum: Troubleshooting and Beginner Help 11-17-2022, 11:31 PM  
Android Phone as Auxiliary Monitor
Posted By Bob 256
Replies: 3
Views: 433
I think you need an HDMI capture device (link below) which outputs using a USB type A male connection (you also need a USB type-A to USB type-C cable and your phone must have the newer USB type-C connector). Not all phones are capable of producing a display from an external USB input, and you'll have to find an app that makes this work (e.g., USB Camera Pro-paid version;Endoscope HD Camera; and others ) if your phone is capable.

I've been looking into this myself but haven't yet tried it, so this is at an experimental stage. Of course, your camera must have a non-4K HDMI output (you might need another adapter cable to get from your camera micro or mini-HDMI into the HDMI capture device which uses a standard sized HDMI input connector). The YouTube link below goes into putting this type of system together. Also, there is the ACCSOON device that accomplishes about the same thing with the advantage of taking an external battery (link below). HDMI Video Capture Card, Upgraded 1080p 60fps Capture Card, Cam Link Card Audio Capture Adapter HDMI to USB 2.0 for Gaming, Live Broadcasting, Nintendo Switch, PS3/4, Xbox : Electronics?tag=pentaxforums-20&


Also, this device:

You Tube

Forum: Pentax SLR Lens Discussion 11-17-2022, 03:48 PM  
Rokinon 12mm fisheye
Posted By Bob 256
Replies: 2
Views: 277
Too Late. I went to the Rokinon site and they were having a 20% BF sale which made the 12mm Pentax $320US, so I pulled the pin - now I will be happy until the next itch starts (but thanks anyway).
Forum: Pentax Price Watch 11-17-2022, 03:41 PM  
Rokinon 20% off sale at Rokinon Site
Posted By Bob 256
Replies: 1
Views: 266
Looking at Rokinon site and right now they are running Black Friday 20% off sale with code BF20. Many of their lenses included in sale.
Forum: Pentax SLR Lens Discussion 11-17-2022, 11:45 AM  
Rokinon 12mm fisheye
Posted By Bob 256
Replies: 2
Views: 277
I've been seeing mention of the new Rokinon 12mm full-frame fisheye on the internet and most have good things to say about it. My lens addiction is itching and I'm wondering if anyone here has had a chance to use the Pentax version yet? I checked the forum lens reviews but couldn't find anything listed. Please tell me I don't have to buy this lens:) : Rokinon 12mm F2.8 Ultra Wide Fisheye Lens for Pentax DSLR Cameras- Full Frame Compatible : Electronics?tag=pentaxforums-20&
Forum: Pentax K-70 & KF 11-16-2022, 10:33 AM  
Weird lines on dark photo review on LCD
Posted By Bob 256
Replies: 3
Views: 413
Definitely something to be concerned about.

We need to know if it's the camera or something else. Do these lines show up just on the LCD screen and not in the files on the SD card? If that's the case, it's your camera. If they're in the recorded files, it could be an SD card issue. Check the files on a computer and see if the lines are visible. If they are, then try to duplicate the conditions with another SD card and see if it happens again. If it happens with another SD card, the problem is in your camera. Make sure you have a good, well charged battery and see if you can duplicate the issue consistently and report your findings.

If the issue is just with your camera, try to get a shot of the LCD screen showing the issue and post it here.
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