Forgot Password
Pentax Camera Forums Home
 

Showing results 1 to 25 of 151 Search:
Forum: Troubleshooting and Beginner Help 01-18-2012, 06:34 AM  
K10D focus problems
Posted By edumad
Replies: 2
Views: 1,812
It is possible, but I doubt that is the issue.
No inclination is evident in the mirror and as I understand it a small one would skew the plane of focus from horizontal (as projected onto the screen) into oblique. That isn't perceptible either.

I still would not rule it out. However, in the optical viewfinder both at 55mm and 18mm the image seems to be in focus at the same distance of focus approximately. Meaning, when the object is ~1m away it appears to be in focus when the scale on the lens is at ~1m. With the correction I have dialled in right now, AF seems to work and match the physics from the scales at 55mm, but the AF sets a focus different focus distance for 18mm.
So I don't think there is anything clearly wrong with the physical path through the lens, mirror, focus screen and focus detector.
Forum: Troubleshooting and Beginner Help 01-17-2012, 06:06 PM  
K10D focus problems
Posted By edumad
Replies: 2
Views: 1,812
My K10D has developed focusing problems. They just seemed to become more and more common, and right now its completely off.

At first I thought it just focused on the wrong place, but then I realized it seems to be horrible front focusing.
These are consecutive images, both focused on the horse, both focused positively a second apart.

IMGP6026 by eduardodourado, on Flickr


IMGP6027 by eduardodourado, on Flickr

The sharpest photo from the day (only about 1.5m)... Testing out the new boots.

IMGP6039 by eduardodourado, on Flickr
This was focused on the lettering is actually isn't too bad, also focused at a distance

IMGP6046 by eduardodourado, on Flickr

No image from this walk is really sharp were it was focused.

I've tried another lens, cleaned the contacts, removed and replaced the focus screen, reset the camera and installed latest firmware.

I've tried to use focus correction in debug mode.
I've managed to get good results for 55mm focusing near and far, as well as with a 70-300mm, by using -450um as correction.

However, with this at 18mm, the lens will only focus very close and does not focus beyond ~3m (it also does not focus well).
In fact, looking at the focus scale of the lens, while at 55mm, the camera can focus on a spot at about 50cm distance and you'll read ~50cm. At 18mm focusing on the same spot at the same distance you'll read ~1m. It focused (beep, hexagon pops up) but its out of focus.
Here are pics from the tests (18mm pics are croped):
-100 um
18mm

IMGP6273 by eduardodourado, on Flickr
55mm

IMGP6274 by eduardodourado, on Flickr

-200 um
18mm

IMGP6275 by eduardodourado, on Flickr
55mm

IMGP6276 by eduardodourado, on Flickr

-300 um
18mm

IMGP6277 by eduardodourado, on Flickr
55mm

IMGP6278 by eduardodourado, on Flickr

-400 um
18mm

IMGP6279 by eduardodourado, on Flickr
55mm

IMGP6280 by eduardodourado, on Flickr

I don't know what I did to the camera, but if it is a FF issue I created, its unlike what other people experienced because when the compensate its ok for that lens... Mine doesn't even work within the whole range of the lens. Maybe because the compensation required is so large...?

As anyone have any ideas?
Forum: General Talk 09-20-2010, 05:58 AM  
SRS Microsystems, Watford, UK
Posted By edumad
Replies: 14
Views: 4,165
I've bought my K10D and 3 lenses from them. Next day delivery all the time.
Superb service, polite people and great prices.
They even have a used section and rental service now. Cannot recommend enough.
Forum: General Talk 09-19-2010, 04:51 PM  
Rally's worth going to... ;)
Posted By edumad
Replies: 24
Views: 3,862
I think you might be thinking of S. Korea and other southeast asia govs. They get to rumble there. I don't remember hearing about such a mess being common in the UK. But of course I didn't watch tv when I lived there...

I was not saying that US are some how unusually radical and extremist by nature, and I wasn't referring to politicians, although they do talk the talk allot. But the personal attacks and their rabid nature, as well as its number and ease with which they occur is unusual.

And of course lets not confuse the radicals of Islam with what I was referring to.
Forum: General Talk 09-19-2010, 01:33 PM  
Rally's worth going to... ;)
Posted By edumad
Replies: 24
Views: 3,862
I would think that people could listen to other then impartial or own side.
Why would the discourse be one sided attack or dual attack. What about discussion?

Political discourse in the US is so violently worded, so filled with rage, I am surprised a new civil war hasn't broke out yet.

To be honest, from what I've seen, the most frequently paranoid and agressive has been the right not the left. But no one is "clean".
Forum: Sold Items 05-24-2010, 03:04 AM  
For Sale - Sold: Tamron SP AF 24-135mm F3.5-5.6 Macro AD Aspherical 50th Anniversary (UK) (Worl
Posted By edumad
Replies: 3
Views: 2,306
Price dropped.
Forum: Sold Items 05-16-2010, 01:40 PM  
For Sale - Sold: Tamron SP AF 24-135mm F3.5-5.6 Macro AD Aspherical 50th Anniversary (UK) (Worl
Posted By edumad
Replies: 3
Views: 2,306
PentaxForums.com Marketplace Listing

Item for Sale
Tamron SP AF 24-135mm F3.5-5.6 Macro AD Aspherical 50th Anniversary (UK)

Asking Price
150

Item Location
Edinburgh

Item Description
This is a very good lens, with a great range, even on crop sensor, on FF it'd be a killer.

Compared to the Sigma 17-70mm, it holds up very well. Although the sigma might get ahead in sharpness, particularly at 24mm, the tammy has proven more consistent in focus. Plus it is FF and has a great range.

My lens comes in orignal case and box (with papers), has the original hood and front cap, I think the back cap is not original.

Here some photos of the gear:




The glass is in excellent condition


But a couple of small specks of dust can be found behind the first element


I'm also including a 72mm CPL in the sale.


Here are some photos from this lens:




Are you the original owner of the item being sold?
No

Are you selling or trading this item?
Selling

Item Condition (Key)
Used
Excellent

Shipping Destinations
Worldwide

Shipping Charge
9 (SDND to UK) for elswhere please as for a quote

Shipping Services
RoyalMail (SDND, 1st class, Airsure, Int. Sign. for)

Accepted Payment Types
PayPal Other (Elaborate)

Return Policy & Additional Details
I will ship Special Delivery Next Day inside the UK, outside via Airsure where available or International Signed for insured.

The item is described as best I can. I will accept returns if the item arrives outside of the condition described (exercising reason).

Please send me a private message if interested in the item!
Forum: Pentax SLR Lens Discussion 05-07-2010, 12:48 AM  
Mirror lens
Posted By edumad
Replies: 28
Views: 8,640
Mirror lenses were made to be compact. They do create the odd doughnut bokeh which can be very disturbing or quite nice in a shot.
Although it must be said, more often than not, it does not compliment the picture.
Most are also F8 (500-600mm) or F11 (1000mm), with a few offerings at F5.6 and even F4 I think (Sigma and russians).
Quality can be good but you have to know what to buy. These modern one sold new on ebay don't seem to compete with the likes of Tamron adataptall-2 and Tokina or Sigma (600mm F8).

I find them great bang for the buck, and if you are trying out something that involves good light or you have a K-X (my K10D doesn't do high ISO well) then its worth a shot.

Some more info on my experience with the Tamron 500mm F8 here and here.
Forum: Pentax News and Rumors 04-16-2010, 08:07 AM  
Pentax 55-300mm in short stock... is a sign?
Posted By edumad
Replies: 29
Views: 12,546
I think it would be advisable for Pentax to improve the range rather than current lenses. Exception for lenses that would be under par, such as the kit lens, which with the new body's philosophy and sensor required a revamp.

A fast tele zoom? A longer tele prime?
Forum: Photographic Technique 04-10-2010, 03:36 PM  
Sharpness? Resolution? Detail? Contrast?
Posted By edumad
Replies: 6
Views: 3,188
Thanks! That was a very informative.
So it is resolution that is at play. Is resolution the measurable property of a lens? Sharpness being just a subjective appreciation of the result, dependent on contrast and resolution?

I see that the tamron's image seems very similar to the tack a resolvin detail in the border of contrasting areas, but not in other areas...(?)
Forum: Pentax Camera and Field Accessories 04-09-2010, 11:35 AM  
Lens hood with filter window
Posted By edumad
Replies: 14
Views: 3,314
I don't think any other other brands do it, maybe some chinese company will do a copy. I haven't seen any, but if they exist they pop up on ebay.
Forum: Troubleshooting and Beginner Help 04-09-2010, 11:27 AM  
Poor performance from A-50/2 on K-x
Posted By edumad
Replies: 6
Views: 1,885
Because it happens only for the range beyond the focus point, and not on the between the lens and focal point it really seems like the lens elements a creating this stange bokeh. Some misalignment?
Forum: Pentax DSLR Discussion 04-09-2010, 07:41 AM  
Why won't Pentax...
Posted By edumad
Replies: 3
Views: 2,119
It is a good idea, but it has to be sturdy, especially since this is how Pentax cameras are marketed. Thing is, patents are already taken by other brands for their mechanisms, which restricts Pentax.
Forum: Pentax SLR Lens Discussion 04-09-2010, 05:52 AM  
Pentax lens in cold weather.
Posted By edumad
Replies: 8
Views: 2,651
Well, only been down to -5C, the only problem is my, not the gear.
Get some gloves, thin ones still work wonders (as long as they cut wind shill) and you're fine.
Forum: Pentax DSLR Discussion 04-09-2010, 05:40 AM  
PPG and IQ
Posted By edumad
Replies: 14
Views: 3,310
I personally would not vote against an image just because it very PP'd.
Its about making a beautiful image through photographic media and this media allows and requires work post sensor exposure to light.
Forum: Photographic Industry and Professionals 04-09-2010, 05:37 AM  
PPG...what's your Voting Criteria?
Posted By edumad
Replies: 28
Views: 6,474
The photo has to catch the eye. Before I look carefully at composition, exposure, WB or subject matter. It just has to pop.
Then composition and subject matter is very important. If composition makes an image pleasant to look at and/or wether the the subject matter is appealing.

Finally technical well made (WB, exposure, etc) these can be substandard is the above are very strong, but if not, they can kill it for me.
Forum: Pentax DSLR Discussion 04-09-2010, 03:08 AM  
Salt spray on camera
Posted By edumad
Replies: 16
Views: 5,651
I had a panasonic fz18 before the k10d and used that in the rain a bit, never had a problem. I think people don't realize how tiny the crevices are, water surface tension doesn't help much in getting it inside... But for sure you are risking itmuch more than with a WR body like the K10D which I've used more extensively in the rain (I'm in Scotland...) with no WR lens and no problem. Juts tilt the body down to minimize problems on the lens, and wipe it when you can...
Forum: Pentax DSLR Discussion 04-09-2010, 03:04 AM  
Problem with Tokina 18-105mm macro lens
Posted By edumad
Replies: 2
Views: 2,666
Woa... I was like,a 18-105mm for Pentax, tell me more :lol:

Yeah, I don't think there is one. But tokina was coming out with a 16-125mm (?)
Forum: Pentax DSLR Discussion 04-09-2010, 03:02 AM  
[K7]When absolutly NOT to use Image Stabilization?
Posted By edumad
Replies: 27
Views: 8,380
I use SR when using a monopod and it either produces no difference or helps a bit.
It depends on me really.
On a tripod turn it off, unless you actuate the shutter before SR is put into action, it will introduced artificial blur.

I figure its signal noise that makes the sensor think that there is some movement, control protocols are not optimal for that situation, so they actually produce a response instead of doing nothing.
Forum: Pentax Film SLR Discussion 04-09-2010, 01:26 AM  
Decent film slr??
Posted By edumad
Replies: 20
Views: 4,753
I believe any autofocus body will work with screw-driven lenses. I know my MZ-50 did work with the 18-55mm.
The problem is that the less being digital the glass isn't big enough, so you don't fill the frame, but if you just want to play aroun, go ahead!
Forum: Pentax Film SLR Discussion 04-09-2010, 01:24 AM  
How do I fix my camera?
Posted By edumad
Replies: 17
Views: 4,349
You can buy a film camera for far less than that nowadays. That repair price seems high, but you are still better off buying a new used camera.
Unless it has sentimental value that is...
Forum: Troubleshooting and Beginner Help 04-09-2010, 01:20 AM  
Built in flash issue
Posted By edumad
Replies: 15
Views: 3,786
That is very strange... Is the camera under warranty? Better get it to Pentax to have a look.
Forum: Photographic Technique 04-08-2010, 06:52 PM  
Pentax and the iPad
Posted By edumad
Replies: 13
Views: 5,416
LOL, another indispensible use for the ipad :hmm:

It is a great toy I'm sure... I wouldn't mind having one :P but wouldn't refuse a lens instead.
Forum: Pentax Camera and Field Accessories 04-08-2010, 05:54 PM  
Tripod on a budget?
Posted By edumad
Replies: 18
Views: 9,827
Redsnapper. Very good build, people at talkphotography.co.uk highly recommend them.
I think they are pretty good value and nothing feels cheap (the bag is great!).
Forum: Photographic Technique 04-08-2010, 05:47 PM  
Sun, beach, paradise
Posted By edumad
Replies: 16
Views: 4,202
THe CPL will definately be helpfull in that setting, so you'll probably want to keep it on for the duration of the shots in the beach ( or most outdoors with sunshine). UV only for protection, but the CPL is there so...
Search took 0.01 seconds | Showing results 1 to 25 of 151

 
Forum Jump


All times are GMT -7. The time now is 01:02 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