Forgot Password
Pentax Camera Forums Home
 

Showing results 1 to 25 of 300 Search:
Forum: Pentax SLR Lens Discussion 1 Day Ago  
Takumar SMC 55mm f2 - front lens element removal
Posted By Just1MoreDave
Replies: 8
Views: 275
I like the glue idea. Heat will also make it easier to unstick glue, if you have a heat gun. A lot of glues are only good up to 150F.
Forum: Pentax SLR Lens Discussion 1 Day Ago  
Tamron 90mm vs Pentax F/FA 100mm Macros
Posted By Just1MoreDave
Replies: 18
Views: 757
It's the Tamron 52, a 90mm f2.5 1:2 macro. The B and BB versions are Adaptall. The 52E adds autofocus, a focus limiter and a dedicated mount. Each version has a different filter size.

The purple spot is elusive. It isn't visible at wide apertures (f5.6 or wider). I think it is most prevalent when the edges of the frame are very bright. An example is product photography in a light tent on a white background. Most of the time, the lens is great - well-built, nine aperture blades, very sharp. If you look at the reviews and comments, some users never notice the purple spot. I bought the Tamron 272E which doesn't have the purple spot and is 1:1 magnification, but I like the 52E a little better for no definable reason.
Forum: Troubleshooting and Beginner Help 1 Day Ago  
Pentax Kx won't take a picture without a lens on M mode
Posted By Just1MoreDave
Replies: 14
Views: 361
It might be battery voltage. If you are very lucky, clean the battery contacts, put in some AA lithium non-rechargeables and it'll work. The K-x is picky about low battery voltage.
Forum: Pentax SLR Lens Discussion 2 Days Ago  
Takumar SMC 55mm f2 - front lens element removal
Posted By Just1MoreDave
Replies: 8
Views: 275
The barrel unscrews on the much older Auto-Takumar 55mm lenses, but on yours, the engraved trim ring unscrews - the barrel won't. Two things you can try. Use an old tooth brush to clean the filter threads because dirt can jam them. And very carefully place drops of penetrating lubricant on the filter threads without getting any on the engraved surface. It should run down the threads. You'll have to clean the lube up later to make sure it doesn't work its way further into the lens, but drops are usually OK. You don't want it on the engraved surface because you want friction there. If the lens hasn't been dropped and the filter threads are still round, I keep trying until the trim ring budges. Drilling holes is drastic.
Forum: General Talk 3 Days Ago  
Your vehicle: what do you have, why do you like it, and what do you not like?
Posted By Just1MoreDave
Replies: 1,964
Views: 106,803
I just got back from a trip to Connecticut for my brother's 60th birthday, three years older than me. My sister had a trivia game to see who knew the most about him, and the big question was to name all the cars he's owned. The total number was 12. No one got more than 9. Company cars (about five) were excluded. We had to remind him of a few. It made me feel better about lenses, that's for sure! The list was:
Pontiac Phoenix, Dodge Omni, Plymouth Shadow (all former rental cars)
Chevy S10 Blazer, Mitsubishi Montero, Jeep Cherokee, Chevy Spectrum (all with salvage titles, slight profit for this period)
Ford Ranger, Ford Taurus, Ford Focus (the Ford period)
Nissan Pathfinder (another stab at an SUV, still not happy)
Subaru Forester (current car, a 2010 I think)
Forum: Troubleshooting and Beginner Help 3 Days Ago  
Pentax K50 reliability issues?
Posted By Just1MoreDave
Replies: 17
Views: 546
If you have the some tools, skills and can get the correct part, the best path is to buy an already broken K-50. The repair is not that hard. Some people have done it without any previous experience, because the steps and pitfalls are well-documented. But if I wasn't that sure of my untested repair ability, it might be too bold to start out with a broken camera.

I felt like because I had all the stuff, I had the moral obligation to repair a K-30. Not exactly sure why I need a fourth camera, but I like it.
Forum: General Talk 08-15-2019, 06:55 PM  
helpful things to know when traveling ;)
Posted By Just1MoreDave
Replies: 16
Views: 501
I took an overnight Amtrak train last month (California Zephyr) and learned a few of things.

One is, there are two categories of Amtrak employees: conductors and everyone else. Conductors usually have a hat and radio, and short shifts. An overnight train will swap out conductors every 8 hours or so. They drive the train, know the schedule, and enforce the rules. Other employees are there to manage the dining car and sleeper cars. They don't switch out, so you see the same people and know their names. The conductors don't want dining or pillow questions. The dining car staff doesn't always know the next stop. Also, after 9pm or so, the only employees you'll see are conductors until the morning. Get your sleeping berth set up before the car attendant goes off duty.

Two, Amtrak is the lowest priority train on the system and owns very little track or station facility. Sometimes they're on time, sometimes they're really late. Freight trains have priority and might break down in an inaccessible tunnel. There are no convenient rail bypasses. Don't make detailed plans to get there on time. Maybe buy travel insurance.

Three, the sleeper cars don't have locking rooms or berths. A thief would have to be somewhat brazen but could take all your stuff.

Four, the Zephyr is marketed as a highly scenic trip. It is, but photography is difficult. The windows are all double paned polycarbonate, not necessarily clean, and often have interior reflections. The observation car has reflections from everywhere. The train is sometimes moving fast. You'll get better at it, but great glass is probably not useful. The 18-135 or 28-105 is fine. Keep the shutter speed up to compensate for train movement. Phone users can press the phone to the window for less reflections. You are stuck with whatever time of day you get.
Forum: General Talk 08-14-2019, 04:24 PM  
Your vehicle: what do you have, why do you like it, and what do you not like?
Posted By Just1MoreDave
Replies: 1,964
Views: 106,803
My dad bought a 73 Marina (Austin in the US) in their brief US appearance. I never drove it but I remember having to pull the shifter vertically to get to reverse. And after awhile, the key became difficult to remove from the ignition because of the antitheft steering column. After he traded it in, it was stolen from the next owner before the state updated their records, so my dad got a call from the police about it, in a bad neighborhood with the key still in the ignition. It was a great dark aquamarine color.

They used to have a running gag on Top Gear UK where they'd drop a piano on a Marina.
Forum: Troubleshooting and Beginner Help 08-14-2019, 02:47 PM  
Damage checklist after camera/lens takes a tumble?
Posted By Just1MoreDave
Replies: 5
Views: 474
If everything seems to function well enough to take a photo, then look for misalignment. Optical misalignment could happen in the viewfinder, prism, screen or mirror. The main sensor or AF sensors could be knocked out of alignment. The lens mount can be tilted. The lens elements might shift or tilt.

I'd put on another undamaged lens and see if the viewfinder shows me what I expect. The viewfinder image path isn't what the sensor sees, so your test is to see if those two show the same frame in the same focus. Look for differences left and right or top and bottom.

Sensor problems will be the opposite of optical problems. AF testing should check points on the left and right.

Lens problems will look like a decentered lens, with different left and right sides. The mount screws might be loose or can't be tightened.
Forum: Pentax DSLR Discussion 08-12-2019, 12:57 PM  
On the topic of upgrades
Posted By Just1MoreDave
Replies: 17
Views: 782
I upgraded from a K-7 to a K-5 IIs, both bought new but late in the cycle. I really like the new camera and that step is an upgrade, chiefly for high ISO. The K-5 II or IIs still commands a little bit of price premium used, but probably worth it. I like the size too, and it's nice to have a K-7 for spare parts.

But if you think you want something a little different or better, the upgrade is not clear. I'd like to have a top tier camera but there isn't a totally new one yet. The KP is almost enough. The K-70 is not bad.
Forum: Pentax SLR Lens Discussion 08-12-2019, 07:48 AM  
DA 21 or HD DA 21 What's the right price?
Posted By Just1MoreDave
Replies: 16
Views: 805
I didn't wait that long to see a used SMC one for $200 in the marketplace. Shipping should be cheaper because the lens is so small and light.
Forum: General Photography 08-11-2019, 04:42 PM  
Tunnel Tour - Tulsa
Posted By Just1MoreDave
Replies: 12
Views: 469
Doug Jackson probably has SV Seeker tours, though he is in the middle of painting.
Forum: Pentax DSLR Discussion 08-08-2019, 08:51 PM  
Dropped on concrete and fixed!
Posted By Just1MoreDave
Replies: 16
Views: 725
Yes, some awesome shots and flight info were posted in this thread:

Pentax k10d in space - PentaxForums.com

I have only dropped one other Pentax. My P3n fell out of a bag that I thought was zipped. The rear element of the Sigma 35-70 zoom broke but the camera was fine until it suffered from lack of use.
Forum: General Talk 08-08-2019, 08:34 PM  
Heading out....
Posted By Just1MoreDave
Replies: 6
Views: 294
I hope it still feels lightweight after the portages. I tried to pick up my completed wood canvas canoe. It was supposed to be 75ish pounds , feels like 100 pounds, definitely not putting that on my shoulders.

The water taxi is an interesting all-wood construction. Open gunwales and ribs like a canoe, looks like cedar planks glued up with fiberglass like a cedar strip canoe.
Forum: Pentax DSLR Discussion 08-08-2019, 01:24 PM  
Dropped on concrete and fixed!
Posted By Just1MoreDave
Replies: 16
Views: 725
Have you ever known that eternal moment as your camera falls to the ground? The regret that you weren't standing on bubble wrap? Or the sudden realization that maybe you did a crappy job hastily attaching the strap? People around me gasped in sympathetic horror! (really)

If this happens to you, try to have your camera and DA 18-135 fall on the left bottom side, just left of the battery door. If you get lucky and have never ever complained about the lack of a new top tier APS-C replacement, the camera still works fine. The only damage was the battery pushed out on the battery door at impact. One of the metal tabs that lock the door in place got bent slightly. There are two screws on the inside surface of the door. Unscrew those, the tab is right there, flatten it back out, screws back in, done.

Useful information, the whole K-7 bottom plate is the same part as on the K-5 IIs. The slight downside, your camera now has a Hoya label.
Forum: Pentax SLR Lens Discussion 08-07-2019, 12:18 PM  
Need some help on lens condition
Posted By Just1MoreDave
Replies: 10
Views: 519
The edge is really unlikely to be in any shot. I think you just have to worry about progression - is that "small section" going to get bigger. Then how difficult it is to fix. Then if it's the only copy ever made or you could keep looking. Also if you can't fix it, you will have a tougher time reselling it.

I have an SMC Pentax-A 135/2.8 that I bought with some fungus on the edge of the front element (described by seller). What I thought at the time was it was an easy fix and it wouldn't affect photos. I was right about photos but couldn't immediately figure out how to take apart the lens. I blasted the lens with UV and left it. I live in a pretty hostile environment for fungus - we add humidity to the house air to get it up to 15%. It hasn't gotten worse or spread.

That's a four-element prime and at it's peak, a $120 lens in perfect shape. Worth the risk for me even if it went badly and I replaced it.
Forum: Troubleshooting and Beginner Help 08-03-2019, 01:41 PM  
How to separate SMC Pentax 55mm f2 lens elements???
Posted By Just1MoreDave
Replies: 6
Views: 645
I haven't taken apart the K mount version. On the SMC Takumar version, the part that restricts the lens to f2 also holds the aperture blades in place. I think the opening could be filed to remove the restriction. The part seems like it's anodized aluminum. The blades appear to open the same as the f1.8 version, so they look like they open enough to get f1.8 even though the aperture ring will point to f2. So maybe you could make the lens slightly faster.

I wouldn't modify the K mount version for four reasons. It's sort of rare because it was only sold as a kit lens with the first K mount cameras. If you don't want an f2 lens, sell it to someone with an old K1000. I don't have the ability to machine a circular opening so it would be an irregular circle and look like crap. I don't think the speed gain is worth it. And it might not work.

If someone had a lot of time and 3D printer access, they could create a new part with a larger opening. Plastic would work fine. Then the modification wouldn't be destructive.
Forum: Mini-Challenges, Games, and Photo Stories 07-27-2019, 08:38 PM  
=planes, trains, boats and automobiles=
Posted By Just1MoreDave
Replies: 3,053
Views: 247,676
My canoe is done and back in the water for the first time in 25 years or so. It was built in 1944 and my dad bought it in 1967. It took me two years to replace 34 of the 52 ribs, 70% of the planks, stems, gunwales, seats and keel. Then a lot of sanding and 7 coats of varnish for the interior. The exterior was canvassed, filled, faired, primed and painted with 4 coats of red. I made the paddle in the fourth shot. The last shot is my dad in 1969, the summer after he fiberglassed the exterior.

IMG00101 by Dave, on Flickr

IMG00099 by Dave, on Flickr

IMG00103 by Dave, on Flickr

IMGC6988 by Dave, on Flickr

64827075_10157229898531171_7847395627683020800_o by Dave, on Flickr
Forum: Pentax SLR Lens Discussion 07-27-2019, 03:23 PM  
Takumar 70-200mm f/4
Posted By Just1MoreDave
Replies: 3
Views: 505
I have a copy of that lens. My parents gave it to me for my birthday in the early 90s. I used it a lot on film. It's tough, easy to use on a DSLR because it's an A lens, and a constant aperture. It isn't very sharp at f4 and isn't very flare-resistant. The focus/zoom ring will feel almost loose, much easier to move than any manual focus lens I've used. It's fairly large and heavy. I probably haven't used it in 12 years. I got an SMC Pentax-F 70-210mm f4-5.6 that works a lot better, is more compact and more compatible with a Pentax DSLR. For your purposes, that lens is optically fine but not great for manual focus and you don't need AF or compatibility with SR. Maybe the SMC Pentax-A 70-210mm f4 instead? There's another thread on 200mm lenses for a K-1 with some other suggestions for zooms and primes.
Forum: Troubleshooting and Beginner Help 07-25-2019, 09:29 AM  
vignetting
Posted By Just1MoreDave
Replies: 9
Views: 515
If you use an APS-C camera and lenses meant for 35mm film, you hardly ever see significant vignetting. I see it when I use my 500mm f8 mirror lens, usually because I'm pushing the image hard in processing to make up for the inexpensive lens.

The DA 18-135 has vignetting sometimes in the extreme corners. There are some fixes. If you crop about 5%, that is gone. Post-processing with software that has a profile for that lens works too.
Forum: Pentax SLR Lens Discussion 07-21-2019, 05:08 PM  
S-M-C Takumar 135/2.5 V2 vs. SMC-K 135/2.5.....are they optically the same ?
Posted By Just1MoreDave
Replies: 9
Views: 545
The K-mount version is slightly heavier. The lens hood is less impressive. Contemporary advertising literature suggests that K-mount lenses have something better in the coatings. Sometimes one is cheaper than the other.
Forum: General Talk 07-20-2019, 08:42 AM  
Your vehicle: what do you have, why do you like it, and what do you not like?
Posted By Just1MoreDave
Replies: 1,964
Views: 106,803
The SLK started complaining about service so we took it to the dealer on Friday. So they washed it. We lined up for service behind a 1971 280SE 3.5 Cabriolet, looking like it just rolled out the factory door. These go for well into six figures today, and were handbuilt luxury cars. My wife immediately decided she wanted one. I forgot that I owned a phone with a camera and had it with me, otherwise I'd show a photo.

The SLK is just short of 5 years old. We were offered all kinds of additional dealer profit items when we took delivery, but one good purchase was protective film for the front end. I don't know what brand they used but this stuff hasn't yellowed and is still in good shape. You can see a few rock marks in the film which don't get down to the paint.
Forum: Troubleshooting and Beginner Help 07-19-2019, 09:26 AM  
Macro Flash Setup
Posted By Just1MoreDave
Replies: 9
Views: 1,207
Maybe you already know this, but the onboard flash will always fire at full power with that lens. Lenses need to have an A position on the aperture ring (and be set to A) for the onboard flash to adjust power. If you wanted to use extension tubes, you'd need tubes with electrical contacts. That applies to any P-TTL external flash.

Since that limits your choices in lenses and accessories, I suggest fully manual flashes instead. You have to set the power level yourself but you can use reversing rings, bellows, M42 lenses or other stuff. The only thing I was ever good at with macro was buying more macro accessories, so I don't have any specific recommendations, except that you don't often need huge amounts of flash power. When you're hanging the flash off a bracket, smaller is better.
Forum: General Photography 07-15-2019, 05:59 PM  
3DPrinting a MX Grip
Posted By Just1MoreDave
Replies: 6
Views: 529
I was thinking this: Take off the strap and triangular ring. Move the upright part of the grip so that it goes over the lug. Make a hole in the top of the grip so you can slide a larger round ring through the grip and lug at the same time, and attach the strap to that ring. That pins the top of the grip in place so you don't have all the stress where the upright meets the bottom plate part. It would give you more room between the upright part and the DOF preview/self timer lever.
Forum: Post Your Photos! 07-09-2019, 09:25 PM  
Pets Getting back into it
Posted By Just1MoreDave
Replies: 10
Views: 398
I missed those pictures. Good to see them again.
Search took 0.03 seconds | Showing results 1 to 25 of 300

 
Forum Jump


All times are GMT -7. The time now is 10:25 PM. | 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