Search results for 'sensor cleaning' - page 147
Recommended Service Centers for Fungus Cleaning
Or try . K.
Posted by womble on 20/04/2012 - 10:12
Recommended Service Centers for Fungus Cleaning
Sigma 400's are very difficult, almost impossible to repair. It's not usually fungus either, it's the cement between the elements breaking down.
Posted by Algernon on 20/04/2012 - 11:24
Recommended Service Centers for Fungus Cleaning
All your answers are very much appreciated. I have weighed the options, and will try contacting Sigma first since that seems to be the most expensive route.
Posted by Opethian on 21/04/2012 - 13:30
Recommended Service Centers for Fungus Cleaning
This is an old lens. I'm quite sure Sigma won't touch it. :( You often see the Canon version for buttons, because the chip inside only lets it work at f/5.6.... no solution even from 3rd parties.
Posted by Algernon on 21/04/2012 - 14:57
Recommended Service Centers for Fungus Cleaning
Sigma 400's are very difficult, almost impossible to repair. It's not usually fungus either, it's the cement between the elements breaking down. +1 - I've tried to clean the non-APO version of these lenses and whilst it wasn't hard to get apart, I found that the internal coatings seem to be very ...
Posted by sorted78 on 28/04/2012 - 08:22
SMC-F 28mm F2.8
I own 3 prime lenses in 24 - 28 mm range; - Sigma 24/1.8, a fantastic lens. Razor sharp wide open. Bulky. My main portrait lens lately. A few samples, both at f2.2: http://www.gorjup.eu/blog/blaz-igralec-rugbyja-pri-rugby-klubu-ljubljana/ http://www.gorjup.eu/blog/peter-kavcic-kapetan-rugby-k...
Posted by flat4 on 27/04/2012 - 08:37
Lens for documenting / portraits at a wedding
I have the 50mm 1.4 & the 35mm 2.4, I use the 35mm more, just for the FOV. The 50mm is to long on a crop sensor, great for head & shoulder portraits. Also by going 35mm you can zoom in, if they use the 50mm you can't put stuff back into the shot ;-)
Posted by cabstar on 23/04/2012 - 13:52
M50 f4 macro on K5
If the return postage is more than the cost. Chalk it up to experience and have a try at stripping and cleaning the insides. It can be done, even with fingers like popeye (mine) if you proceed carefully. Otherwise send it back as suggested above, would agree with David's analysis. Bernard
Posted by Frogherder on 28/04/2012 - 23:35
Centon 500mm Mirror Lens
Thanks for all the info. Kh1234567890 got me thinking so I removed the filter from the lens. It is a KM-500 Skylight 1A and having looked at it very closely it is covered with small inperfections in the glass and no matter of cleaning will remove them. It also looks a little milky when compared to a...
Posted by kevinwolves on 29/06/2012 - 10:03
Mint and super rare Pentax lens collection - some advise please
As I understand it, a shift lens has a larger area of coverage that can be shifted relative to the camera. Which should mean that the maximum shift in any given direction is larger on an APS-C sensor than FF (assuming there are no mechanical limits), I think?
Posted by johnha on 06/05/2012 - 11:39
Lens and lens mounts
It's a complex issue that depends not only on fitting the lens, but also on the back-focus distance to the sensor. Not all lenses can be fitted to all cameras. When they can, sometimes they don't focus to infinity and sometimes they are not easy to use. SRB-Griturn are the experts on what is poss...
Posted by johnriley on 18/05/2012 - 23:59
Lens and lens mounts
The rear focus distance for OM lenses is 46mm, (about 1/2mm more than the PK mount) so if the mount fits inside the PK body an adapter would be possible, I do't think it does - but I've never tried. For macro work you can get adapters to allow the use of just about any lens on any SLR (with a bel...
Posted by petrochemist on 19/05/2012 - 09:13
smc FA 1:1.4 50mm
I have this lens. the focus ring turns to focus. You cannot pull it in and out. not sure what yo mean by "Can't get it to shoot blurred background at f1.4 on either automatic or manual settings" Do you mean you cannot set it to 1.4 ? Or do you mean when you set it to 1.4 the backgrounds aren...
Posted by Smeggypants on 20/05/2012 - 20:04
Sigma 70-200mm F2.8 EX DG OS HSM Lens - Pentax Fit
You won't regret getting the 70-200 it's awesome, especially its AF speed, as you know the K-7 is not exactly lightening on the AF front but with the HSM it's great. I do shoot on continuous focus and hi speed and tend to take a burst of shots as the karts or cars head towards me and tend to get som...
Posted by SteveEveritt on 16/10/2012 - 20:13
Fast short zoom advice
Are you shooting full frame on a film camera or a DSLR with the cropped sensor. If the latter then the pentax options are the DA*16-50 which has a constant f2.8, and the DA*50-135, also a constant f2.8. In my view both are beautiful lenses and yield great results. There are also offerings from tamro...
Posted by matwhittington on 24/05/2012 - 17:28
Using a manual lens
Hi Maria You also need to use the camera in manual mode - once you have done as mentioned above move you dial around to 'M' - when focusing you will notice the focus confirmation light (bottom centre of the viewfinder) light up when in focus - if it is the same as the K10D onlt the central af se...
Posted by Stuey on 26/05/2012 - 20:00
Using a manual lens
Hi Maria You also need to use the camera in manual mode - once you have done as mentioned above move you dial around to 'M' - when focusing you will notice the focus confirmation light (bottom centre of the viewfinder) light up when in focus - if it is the same as the K10D onlt the central af se...
Posted by autumnlight on 26/05/2012 - 20:43
Pentax DA* 16-50 or Sigma 17-50 (both F2.8)
I went for the Sigma 17-50mm f2.8. I was put off the Pentax 16-50 by it's higher price and reports of failed SDM motors.... Guess what? Before long the focusing on the Sigma was atrocious and it had to go back to Sigma for a new auto focus motor. (UK 3 year guarantee, lens back with me in 12 d...
Posted by grahamcoad on 08/06/2012 - 18:39
Jacobs Glasgow
This is an interesting development (for a window shopper like me at least). Jacobs in Glasgow had no Pentax kit whatsoever last time I looked in. In fact when I bought a K5 from them last December they had to source the last one in the company from a shop 'down South'. that one was returned due to s...
Posted by hamish3000 on 01/06/2012 - 10:22
A question on edge sharpness of lenses
Telecentric first. Especially with wide angle lenses, the light exiting from the rear element can be quite diverged, so the rays hit the film at an oblique angle. This is fine for film but digital sensors have each pixel sunk slightly in a pit. It is much better if the light rays are parallel and fa...
Posted by johnriley on 03/06/2012 - 14:26
