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Forum: Pentax SLR Lens Discussion 11-16-2020, 02:40 PM  
Ikea Lamp and Takumar Lens
Posted By psoo
Replies: 17
Views: 6,442
Thanks for the reply Steve. However, I have an old Pentax lens that has an overall yellow tinge. Don't remember which lens but it's squirreled away somewhere. I don't think it's because it has degraded over time. Isn't it likely that it's the original coating?
Forum: Pentax SLR Lens Discussion 11-16-2020, 05:09 AM  
Ikea Lamp and Takumar Lens
Posted By psoo
Replies: 17
Views: 6,442
I'm sure that for psychological reasons it's nice to remove the yellow tint from a lens. However, does yellowing significantly change the color of the image? If it does, some photos may benefit from a warmer glow. If not, why bother?
Forum: Pentax SLR Lens Discussion 09-26-2020, 01:57 PM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
Hi Des, thanks for your comment. I clicked on the link in your message and was surprised to find that it was about a question that I had asked in this Forum 6 years ago asking for comparisons between the 18-250 and 18-135 lenses. Yes, you're right that most people thought the latter lens was sharper. That's what prompted me to buy the 18-135. In this thread I stated that I couldn't tell the difference between the two lenses and a Tamron 28-300 mm. I decided to go back to my collection of photos for the two Pentax lenses and I know agree that the 18-135 is in fact sharper for most of my shots. I use this lens most of the time but the extra reach of the 18-250 comes in useful for bird and insect photography.
Forum: Pentax SLR Lens Discussion 09-25-2020, 12:42 PM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
Just received my replacement lens from Japan. It was in mint condition and the total cost including taxes was $181. Shipping was free and took seven days. I took a few shots on my K70 and it performed flawlessly. Glad I didn't repair my broken lens since it would probably have cost well over $200 at Precision.
Forum: Pentax SLR Lens Discussion 09-22-2020, 04:59 PM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
Thanks for the advice.
Forum: Pentax SLR Lens Discussion 09-20-2020, 02:45 PM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
I'm glad that I bought another DA18-135 lens. I was very happy with my original since it was sharp and compact. It was my general purpose lens for the last few years. Prior to buying it, I used my DA 18-250 or my Tamron 18-300 XRDiAF lens. However, they were bulkier. In use, I found them all to be equally sharp and the Forum lens reviews seem to confirm this. Now I have to think about what to do with my non-focussing lens. Does it have any value?
Forum: Pentax SLR Lens Discussion 09-20-2020, 05:54 AM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
I decided not to repair my lens because the cost (at least $200 from Precision) is greater than the cost of buying a used lens in excellent condition. I checked on Ebay and made a bid on a replacement lens. I was told that I was the highest bidder with my offer of $150. Shipping was about $30 and with tax I would have paid about $200 total. I later checked to find that the lens was no longer available and I assume that somebody else had overbid me. I was surprised that I had not been warned that I was no longer the highest bidder and that I should rebid. I then decided make an offer on a second lens, again about $150, and contacted the seller with a private message. I got no answer and later found that the seller was "offline". Why bother to sell some thing if you are going to be offline? Finally I bought a lens from Japan that was offered at a set price. The lens was stated to be in excellent condition and it cost me $180 including taxes. Shipping was free. I've always gotten excellent service from Japanese sellers. They communicate well and keep you informed about the status of shipping. Can't wait to meet my new lens.
Forum: Pentax SLR Lens Discussion 09-08-2020, 02:15 PM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
I sent my lens to Erric for repair and just got an email from him. He can't repair my lens because he can't get parts from Ricoh. I went online to Precision Camera, the authorized repair shop for Pentax, and it states that this kens can be repaired for about $200 plus taxes. Seems reasonable I think I'll call them to see if they have parts for the job.
Forum: Pentax SLR Lens Discussion 09-03-2020, 04:57 PM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
Today, I sent the lens to Eric. On his website it states that he will email me an estimate for repairs. I'll take it from there.
Forum: Pentax DSLR Discussion 09-03-2020, 04:51 PM  
Lens choice for K-50 astrophotography
Posted By psoo
Replies: 22
Views: 1,974
Thanks Mossy, appreciate your advice.
Forum: Pentax DSLR Discussion 09-03-2020, 08:58 AM  
Lens choice for K-50 astrophotography
Posted By psoo
Replies: 22
Views: 1,974
It's great to see that a 30 second exposure doesn't blur the image due to the earth's rotation. How long an exposure have you used before the image is blurred for shots of the stars and constellations?
Forum: Pentax SLR Lens Discussion 09-01-2020, 09:40 AM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
Thanks, Slyfox, I was just about to ask if anybody could recommend a lens repair shop. I could probably buy a used lens for about $300. Could a repair cost close to this?
Forum: Pentax SLR Lens Discussion 09-01-2020, 05:28 AM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
Hi Kiwi, the lens focussing problem occurred when I was using the viewfinder, I seldom use Liveview because in bright conditions it is difficult to see the picture. I tried using Liveview as you suggested and I still had the same problem. However, when I tried to focus I detected the camera give a double shake as if it was trying to focus, but nothing happened. I have concluded that the lens has an electro-mechanical problem and I am trying to decide if it's worth repairing. I own a Tamron 28-300mm lens and a Pentax 18-250mm lens. A comparison showed that they are just as sharp as the 18-135. Maybe I'll use one of these as my standard lens. They are a bit heavier but that's OK.
Forum: Pentax SLR Lens Discussion 08-31-2020, 07:19 PM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
Hi Kiwi. I tried focussing at different focal lengths. In auto focus, there is no response when I point the camera at a subject. In manual, I can spin the focus ring and again nothing happens. It seems that the lens is not sensing anything when I try to focus and hold the shutter button halfway down at the same time. It's a mystery.. There must be an electrical short circuit somewhere in the lens.
Forum: Pentax SLR Lens Discussion 08-31-2020, 05:51 PM  
DA 18-135 mm lens won't focus
Posted By psoo
Replies: 22
Views: 1,154
I went out for a hike today and tried to take a photo with my DA 18-135 lens attached to my K70. The lens would not focus in either the auto or manual mode. It was working yesterday and I can't figure out what the problem is. I took off the lens and polished the electrical contacts on both the lens and camera body but it did not solve the problem. I went home and checked the settings on the camera but to no avail. I though the camera was broken even though it had not been heavily used. As an afterthought I put my DA12-24 on the camera and it worked perfectly. It was the 18-135mm that was busted. I was surprised since I always believed that lenses almost never fail - it's always the camera. What advice can you give me, learned Pentaxians?
Forum: Pentax DSLR Discussion 04-01-2020, 06:49 AM  
Focussing for sharp images.
Posted By psoo
Replies: 52
Views: 2,866
Not too bad a shot, Steve, the tail feathers are slightly sharp.
Forum: Pentax DSLR Discussion 03-31-2020, 07:16 PM  
Focussing for sharp images.
Posted By psoo
Replies: 52
Views: 2,866
Nearly all of my birds are accelerating. When I approach a sitting duck it takes off and accelerates. As I pan my camera the camera also accelerates.
Forum: Pentax DSLR Discussion 03-31-2020, 05:39 PM  
Focussing for sharp images.
Posted By psoo
Replies: 52
Views: 2,866
I am in full agreement with you. A tripod will reduce camera shake in most cases but is it worth the effort in setting it up and carrying it around? Not for me. I only use a tripod when I want to be in the photo with family and friends. Thanks for your comment and also helping to increase my vocabulary. I had never heard of the word "Bogarting" although I suspected it was about Humfrey. I checked the dictionary and now I know:)

---------- Post added 03-31-20 at 08:51 PM ----------



God Bless You my Son.
Forum: Pentax DSLR Discussion 03-31-2020, 02:53 PM  
Focussing for sharp images.
Posted By psoo
Replies: 52
Views: 2,866
Thanks so much Garry, your advice is what I wanted from you pro's. It's these little secrets that gives experienced photographers the edge over others.
Forum: Pentax DSLR Discussion 03-31-2020, 01:43 PM  
Focussing for sharp images.
Posted By psoo
Replies: 52
Views: 2,866
Confession is good for the soul. You can be forgiven.
Forum: Pentax DSLR Discussion 03-31-2020, 11:36 AM  
Focussing for sharp images.
Posted By psoo
Replies: 52
Views: 2,866
Thanks Steve, that's a good analysis.

---------- Post added 03-31-20 at 02:45 PM ----------



Hi Kobayashi, it's been a long time since I encountered the f= m.a law of motion. It shows that a camera with a heavy mass (m) will take more effort (force) to make it move or accelerate (a). However, the law also shows that if you are trying to take of photo of a flying bird, and you have to pan to keep the bird in the frame, a heavy camera is a disadvantage. Did you realize that?
Forum: Pentax DSLR Discussion 03-31-2020, 11:33 AM  
Focussing for sharp images.
Posted By psoo
Replies: 52
Views: 2,866
Hi Biz, your two rules for sharpness are what I have been driving at. They are "buying the highest resolution camera/lenses that you can afford" and develop techniques for "getting the best sharpness out of your current equipment". In this thread I'm trying to coax out of you guys your trade secrets for getting the best sharpness out of your equipment. Come on, spill the beans, we ordinary photographers need help.
Forum: Pentax DSLR Discussion 03-31-2020, 11:04 AM  
Focussing for sharp images.
Posted By psoo
Replies: 52
Views: 2,866
Liveview is a feature that I seldom use, even though it focusses the image on the actual focal plane to give the best focus. I find it difficult to use in strong sunlight because I can't see the image clearly. However, I guess I could force myself to give it a try to see if there is an improved sharpness.

---------- Post added 03-31-20 at 02:12 PM ----------



Tripods are fine for reducing shake but who wants to lug around a large, heavy tripod? It's OK if your taking wedding shots in a set location, or for astro photography, but it's a hindrance if you are in a crowded tourist place where you may have to keep moving. I have several tripods and they are rusting away in a closet somewhere. Nar, it's not for me

---------- Post added 03-31-20 at 02:20 PM ----------



Hi Wasp, let me see if I understand you. By hyperfocal distance do you mean the actual distance from the camera to the chosen image? If so, are you saying that an auto focussing camera could latch onto the horizon instead of say, the swan on a pond, which is your intended image. Thus the horizon would be in focus instead of the swan. Maybe the camera should be set to manual focus for these situations so that you focus on your intended object.
Forum: Pentax DSLR Discussion 03-31-2020, 08:43 AM  
Do I need to upgrade from my K50?
Posted By psoo
Replies: 81
Views: 5,011
OK Christian:)
Forum: Pentax DSLR Discussion 03-30-2020, 05:46 PM  
Do I need to upgrade from my K50?
Posted By psoo
Replies: 81
Views: 5,011
Hi DBS, I'm not sure what you are asking in your question. If you're asking what I decided to do about upgrading from my K50, I originally planned to wait a while until the price of the KP dropped to a lower value, and then buy one. However, a mint K70 body was offered on eBay for $450 so I decided to buy it. I still haven't put it through its paces but I think from feedback in the Forum it was the best decision for my type of photography. We'll see:)
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