Search results for 'sensor cleaning' - page 119
Sigma 18-125mm: to HSM or not to HSM
To help you decide between HSM or not: vs Apparently the distortion is a mixed bag, the vignetting as well, CA are worse in the new version. MTF data would have to be compensated for difference in sensor limits, but seems to have improve, maybe.
Posted by edumad on 29/04/2010 - 17:53
Sigma 18-125mm: to HSM or not to HSM
To help you decide between HSM or not: vs Apparently the distortion is a mixed bag, the vignetting as well, CA are worse in the new version. MTF data would have to be compensated for difference in sensor limits, but seems to have improve, maybe. Problem is though one is on the 350D and the ot...
Posted by Anvh on 29/04/2010 - 19:16
Sigma 50mm f2.8 ex dg macro
Hello I have this lens and love it :D I agree with using the auto apeture, however, on my k10d using manual focus is often better for macro work, I do not have a focus rail but do have and use a Uniloc system 1700 tripod which works for me. As you will have noticed the lens can be extreme...
Posted by Stuey on 30/04/2010 - 21:02
wide angle lens advice required
Wider than 18, non-fisheye, Pentax produced a 15mm 3.5 in the "K" and A series. However these are rare beasts and you will have to pay more than a new DA15mm to own one ! Add to that the problem with flare you might encounter, I would suggest "old" is not better in this case. You will do bette...
Posted by pschlute on 30/04/2010 - 19:17
wide angle lens advice required
The full benefit of the K/A series 15mm is wasted on the cropped sensor, as is the 28mm Shift lens. So probably better with a newer model lens. Regards
Posted by K10D on 30/04/2010 - 19:34
Tamron sp90 f2.5 plus ex tube and Pentax adapter
Got it. 32 = AE. I had worked out the little button but because the av mode wasn't working, assumed AE wasn't properly rejected. I think the contacts need cleaning but it works, thanks.
Posted by Pentaxophile on 18/05/2010 - 14:46
SDM 50-135mm unavailable
Charging more for a 50-135 than Sigma and Tamron charge for a 70-200 is an argument for another day. Sigmas new 70-200mm f2.8 OS is apparently going to be over a grand. :shock: Be interesting to see what the USA price levels out at. At that price, it must be better than every other 70-200 out the...
Posted by K10D on 05/05/2010 - 22:20
Room Interiors
Thank you Tim, just read though that you can put a 82mm filter in the hood :wink: No, you cannot ;) There is a push-on lens cap with a removable end which looks like a hood, and which you can screw a filter into. But the lens vignettes really badly with this 'hood' on. That they didn't tell :( D...
Posted by Anvh on 13/05/2010 - 16:01
Room Interiors
Yes, unfortunately. I've only used this lens on a D80 which is a crop sensor. Images using the wide end of the lens have a big black circle around the edge :)
Posted by thoughton on 13/05/2010 - 16:03
Tamron 10-24 opinions
it's addictive. Yes, it's "soft"; you could also consider that rendering. There's a helluva lot of information to cram onto that there sensor, so it's not easy. I like the perspective - I stood what felt like 10 feet away from a 50' tree at christmas and got the whole thing in - and I deliberately...
Posted by bretti_kivi on 14/05/2010 - 06:56
landscape lens suggestions please
I think this confuses lots of people. If you take a 28-80mm lens on a 35mm film SLR and put it on a DSLR then the small sensor means that the camera only sees the centre part of the image projected by the lens. Therefore, you need a wider lens for the smaller digital format, to get the same e...
Posted by johnriley on 20/05/2010 - 12:17
Miranda 24mm PKA Macro - Image heavy
When you look at this shot. You can clearly see that only the centre gets blurry, it certainly isn't normal! Is your lens and sensor clean?
Posted by Anvh on 21/05/2010 - 16:35
Miranda 24mm PKA Macro - Image heavy
I was in a camera shop earlier this week when a lady came in with a Panasonic compact that produced images very much like this. The front of the lens was fine, now I wonder if there was a finger print on the inside of the lens from when it was assembled. :?: By the way Whelmed, you really should...
Posted by Daniel Bridge on 21/05/2010 - 17:05
Miranda 24mm PKA Macro - Image heavy
How do you clean it? I've used the cleaning button in the menu - is there a safe way otherwise?
Posted by whelmed on 21/05/2010 - 17:15
Miranda 24mm PKA Macro - Image heavy
Sensor cleaning - on those occasions when the built in sensor shaker hasn't done the trick I've used a Giottos "Rocket Blower" puffer bulb. Make sure the tip of the nozzle doesn't touch the sensor and give it a good blow. If that doesn't work I have heard good things about the Arctic Butterfly cl...
Posted by Dangermouse on 22/05/2010 - 08:00
Best focal length for portrait
Whats the opinions of the Pentax 1.4 and 1.7 50mm for this purpose. Ian The first shot of mine, the mono of the little girl was taken with the DA40mm at f/2.8 so yes any 50mm lens would be very capable to do portrait on the APS-C sensor because it's 75mm equivalant AOV and the classic portrait lens...
Posted by Anvh on 26/05/2010 - 16:04
looking for a 1.4 or 1.8 prtrait lens
I really think that with an ASP-C sensor 77 or 85mm is too long. You have to stand so far away from the subject even for head shots and half length or full length means changing lenses or buying a larger studio. A standard 50-55 mm lens I find to be perfect: never in a person's face (so no disto...
Posted by bwlchmawr on 27/05/2010 - 15:58
looking for a 1.4 or 1.8 prtrait lens
What sort of vignetting? One could argue that a larger front element could cause MORE "digital" vignetting - where the light does not hit the sensor at a right angle. This smacks of theory having little to do with practice. G
Posted by George Lazarette on 29/05/2010 - 01:00
looking for a 1.4 or 1.8 prtrait lens
The larger the front element, the less likely there will be vignetting... or some other such undesirable. I thought vignetting was more likely to occur when using a lens optimised for digital on an analogue camera. (Use a lens on a larger sensor than it was designed for, to put it differently).
Posted by terje-l on 29/05/2010 - 08:53
Sigma 24-70mm.
Hi, I'm thinking of getting the sigma 24-70mm hsm for my k7. Being very new to photography, (about 3 months!), I want to know is this suitable for the k7 and has anybody any comments on this lens? Thanking you in advance. my two cents ... 1. on paper, 24-70mm is a wonderful range for both full fram...
Posted by badbrother on 12/06/2010 - 21:22
