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Forum: Troubleshooting and Beginner Help 10-07-2018, 11:27 AM  
SMC Pentax 50 mm f1.4 screws size
Posted By dean45
Replies: 8
Views: 547
I got a screw to hold the front ring for a Pentax lens from a old Hard drive.

Dean Sturgis
Forum: Pentax Compact Cameras 06-29-2016, 09:34 AM  
help with IQZoom140
Posted By dean45
Replies: 6
Views: 902
If you don't have a changing bag you make do in a dark room with a heavy jacket that you can tie closed at the neck & Waist. You reach in thru the arms of the jacket to the camera you placed in before hand.
The jacket should have a separate liner & heavy outer fabric I have managed with a jacket no heavier than a Army field Jacket
Alternatively if you take the film to a processing mini lab, not just dropping it off at a store they may have a changing bag.

Forum: Pentax Compact Cameras 06-26-2016, 12:44 PM  
help with IQZoom140
Posted By dean45
Replies: 6
Views: 902
This camera should have a manual rewind option, There should be a recessed button to manually rewind the film. There is often a marking by he button that looks like the end of a film cassette with some arrows
pointing into it. Push this button in with a tip of a ball point pen or the projection on the carry strap clasp. I don't remember this camera for sure but his is normal for Pentax power wind cameras or other make
cameras for that matter.
Of coarse it the motor or wiring is toast you will have to pull the film out in a dark room or changing bag.

Forum: Troubleshooting and Beginner Help 06-29-2015, 09:20 AM  
K-10D flips image after taking picture
Posted By dean45
Replies: 2
Views: 575
My K10D never did that, but my K30 sometimes turns the image upside down. I have never figured out why, upside down ones can be next to right side up pictures. I just except I have to invert the picture before showing to other people, post processing or archiving.

Forum: Pentax K-30 & K-50 03-08-2015, 01:08 PM  
Old lenses can break new bodies?
Posted By dean45
Replies: 25
Views: 3,853
A stuck aperture pin can result in over exposure when the lens does not close down before the shutter does it thing.
I had this problem with a 28-200mm Pentax lens, I got way over exposed pictures, stopping the lens down further or increasing the shutter speed did not help.
Later I noticed the exposure was ok with the lens wide open, than I found the lazy aperture lever.

Forum: Pentax Forums Giveaways 12-14-2014, 12:09 PM  
3 Million Post Giveaway: Confirm your entry!
Posted By dean45
Replies: 2,854
Views: 96,315
I did post an entry for the contest.

Forum: Pentax K-30 & K-50 12-09-2014, 11:37 AM  
For Auto ISO, what is your maximum setting?
Posted By dean45
Replies: 33
Views: 3,536
I did testing of my K30 mounted on a tripod of resolution charts taped to my garage door. I used a medium f stop. ISO 100, 200, 400, 800 & 1600 all gave the same resolution level. The 100 to 800 looked similar the 1600 looked much poorer even though the same lines could be resolved. ISO 3200 & 6400 fell off in resolution in addition to looking worse in other respects. I did not try ISO 12800 as I maxed out the shutter speed at this f stop.
Shooting at ISO 800 max should be ok with auto ISO setting. Shooting at ISO 800 manual can be a problem when you forget to reset it when you get to brighter light & end up with f stop 13.5 or smaller with diffraction limiting resolution & every spec of dust on the sensor showing up in clear areas.

I shot pictures in the cave in Mammoth Cave National Park, no flash, tripod or monopod allowed, often not even time to stop to take picture, I had no choice but to let in go to ISO 12800 even with the f/2.4 lens.

Dean Sturgis
Forum: Lens Sample Photo Archive 11-05-2014, 02:43 PM  
Pentax DA 35mm f/2.4 AL samples
Posted By dean45
Replies: 78
Views: 42,941
A great walk around lens, small & light. Not very expensive for a new lens, but review say it is as good as the expensive prime lenses in the focal length range.
The 35mm focal length as same field of view as 52.5mm on FF size. For those of us who have years of experience with 35mm film and 50-55mm lenses it is easy to find the right point to take a picture. dean45
Forum: Troubleshooting and Beginner Help 05-11-2014, 12:12 PM  
K-5 anti-aliasing filter sharpness
Posted By dean45
Replies: 15
Views: 2,071
I'm having an issue. I did a little sharpness test with my 18-55mm and Pentax FA 50mm f/1.4. I didn't see a lot of difference between two lenses at what I believe is their sharpest F-stop (5.6). The FA 50 1.4 tested a lot sharper on Photozone compared to the 18-135.

I remember reading somewhere that the K-5 can inhibit sharp lenses due to the anti-aliasing filter being quite strong.

So perhaps even buying more expensive lenses there'll be a "glass ceiling" (pardon the pun) to sharpness, because of the AA filter ......

Is this the case ? Or am I in error ?

Did you check the image size? 55mm is 10% bigger than 50mm. The FA 50mm would need about 10% better resolution to equal the sharpness of the 18-55mm at 55mm.

Forum: Pentax Film SLR Discussion 01-05-2014, 04:15 PM  
Spotmatic Wikipedia Article
Posted By dean45
Replies: 23
Views: 2,422
I haven't used a Pentax Spotmatic much, but have used one with a watch sized silver oxide battery. At least for normal daytime lighting I got slides that look properly exposed.
The battery was smaller than the compartment of the Spotmatic, I used aluminum to take up the extra space. The biggest operation problem was that I was using the battery
in reverse polarity compared to the Hg battery. The needle than moved in opposite direction of the aperture, that slowed me up a little as I adjusted it.

Forum: Pentax SLR Lens Discussion 10-20-2013, 11:45 AM  
Let's Talk About Teleconverter Bokeh...
Posted By dean45
Replies: 26
Views: 3,438
Here is one from my film days.
lens 55mm Mamiya-Sekor f/1.4 2X screw mount teleconverter Vivitar I think.
f stop unrecorded. Distance from back seat to front seat of a canoe.
The corner & maybe edges have the teleconverter swirl even for things in focus, the ojects in the center are so out of focus
that bokeh may not apply. There are mid distance brush limbs to check for bokeh.
I had to reduce by file to less than 900 MB to upload it, my scanned file was 7.42MB, I hope there is still enough detail yo
show the teleconverter effects.

Forum: Post Your Photos! 07-08-2013, 07:45 PM  
Abstract For Ricoh GRD IV contest
Posted By dean45
Replies: 0
Views: 592
Taken from below plants growing on top of a wall.
Forum: Photographic Industry and Professionals 01-26-2013, 07:27 PM  
Noise Reduction Software Giveaway: Let us help you improve your photos! (ended)
Posted By dean45
Replies: 382
Views: 35,609
"I would like to enter this giveaway."

I entered serial numbers for a A3000, Auto 110 & Honeywell H1a today.
Forum: Film Processing, Scanning, and Darkroom 09-08-2012, 11:52 AM  
Restoration project - 110 negative scanning?
Posted By dean45
Replies: 20
Views: 19,006
I have scanned some 16mm Minolta & 110 negative film with a Nikon Super Cool Scan 5000 scanner. I found that 35mm slide mounts cardboard or plastic would
not hold the film in place or flat enough to scan. I got some slide mount with glass. I put one together with guides in side to take the 16mm film.
The B&W Minolta negatives were good enough to scan at 2400 to 3200 dot per inch for the best ones, The Pocket Instamatic 10 negatives were good
for 1200-2000 dpi. (This was not a very good camera). The Pocket Instamatic 40 negatives (Kodak Gold 200) were good for 3200-4000dpi.
I don't believe the cheap $100-200 scanners or macro lens in front of your camera can match the resolution of the best 110 cameras.
I did however have a problem with Newton's rings on a few of my scans.

Forum: Troubleshooting and Beginner Help 08-13-2012, 12:52 PM  
Trouble with Optio W90 Waterproof Camera
Posted By dean45
Replies: 3
Views: 1,523
I called the Pentax service center, went thru the problems with this camera. He led me thru ther menu to find the reset button.
I reset the camera, I now have 12 Mp. I had to changes a few other presets- i.e. go back to high quality (3star) jpeg compression
and reset the time. I now takes 12Mp pictures even at very low quality max digital zoom pictures.

Dean Sturgis
Forum: Troubleshooting and Beginner Help 08-13-2012, 08:45 AM  
Trouble with Optio W90 Waterproof Camera
Posted By dean45
Replies: 3
Views: 1,523
I believe it does, at least you cann't take 12 Mp pictures.
I just tried 3 Mp at 5 to 25mm actual as well as when using the digital zoom.

Dean Sturgis
Forum: Troubleshooting and Beginner Help 08-12-2012, 07:46 PM  
Trouble with Optio W90 Waterproof Camera
Posted By dean45
Replies: 3
Views: 1,523
I am having problems with my W90 camera. It gave a bad card or card not formatted message. I tried 3 different cards including the one I took over 1000 pictures on. I tried to format cards but than it
gave a bad card message. I found it would still take pictures as long as I did not have a card in the camera, it would still save to the internal memory.

I called the Pentax service center they told me to try a Sandisk card. I don't know why a the brand should make any difference. I bought a Sandisk card and gave it a try. I put it in but forgot to format it,
The camera formatted the card by it self and saved pictures, one of the other cards I was trying before I was able to get formatted. The problem however is that the pictures are only 3 megapixels. I am
not able to set the resolution any higher regardless of ISO setting or any thing else I am able to find in the menus. I will call the service center again but does any have an idea of what I can do now.

Dean Sturgis
Forum: Pentax Film SLR Discussion 06-24-2012, 11:48 AM  
Pentax MZ/ZX recommendation
Posted By dean45
Replies: 20
Views: 3,437
The ZX5n is a good choice for a ZX series Camera. It has better exposure options than some other Zx series cameras. It has a metal
lens mount and does not have a crippled lens mount.
I got one in a box of non working cameras it alone was the only working one.
The auto focus is fairly good not up to the standards of DSLR cameras but faster than the older ones.Under unusual light
conditions it hunts I have to go to Manual focus. Metal lens mount is a plus ( I drop a ZX10 with 100-300mm lens also plactic
mount from a little over knee height - broke both mounts. The crippled mount is a problem if you want to use lens before
the -A lenses such as old M lenses.

Forum: Welcomes and Introductions 03-09-2012, 10:56 AM  
New User
Posted By dean45
Replies: 1
Views: 357
The administrator asked me to introduce my self.
I will use the name of dean45, I live in Minnesota.

I use a Pentax K10D, and when I want a smaller or water proof camera a Pentax W90.
I still have a Pentax *ist DS from before the K10D. I put some film thru a ZX5n.
I started serious picture taking in 1968-1969.

I also collect cameras a large variety but I have most Pentax SLR's.
I hope this forum will lead me to more information on Pentax cameras, and I may be able to
help other people at times.

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