Search results for 'sensor cleaning' - page 117
Samsung 50-200mm with Optical Stabilisation
Have they created a new lens mount then? Bit of a risk I'd have thought, limiting people to a choice of (currently) three lenses. The register (mount to sensor) distance is far shorter so K-mount lenses won't work on it and therefore you can't use K-mount lenses also within the specifications of the...
Posted by Anvh on 29/03/2010 - 17:35
sigma 18 fish eye for film
I have a M42 mount Sigma 16mm Fisheye and when I mount it on my cropped sensor DSLRs, the fisheye effect disappears. When put it on a Full Frame DSLR, the fisheye effect is present.
Posted by grahamwalton on 29/03/2010 - 20:14
sigma 18 fish eye for film
You'd need something like an 11 or 12mm lens to get a fisheye effect on a C-sensor. Very rare used as not many bothered to go wider than 28mm on film!
Posted by Dangermouse on 29/03/2010 - 20:24
What's the difference between a teleconverter and an extension tube?
I have a Tamron SP 90mm f/2.5 macro lens, which, when used on its own gives 1:2 macro. I can get 1:1 in two ways; either by using an extension tube or a teleconverter. I've got a matching 2x teleconverter, which has additional glass elements that increase the focal length to 180mm and reduces th...
Posted by GrahamW on 30/03/2010 - 17:35
What's the difference between a teleconverter and an extension tube?
An extension tube allows close-up pictures: it's just that, an empty tube. A tele-converter is actually a lens which fits between the camera and telephoto to double or triple its focal length albeit with the loss of quality. Both reduce light reaching the sensor/film. Regards, Andrew
Posted by bwlchmawr on 30/03/2010 - 17:43
Prinzflex lenses
The proof will be in the images Ted. I'd take a few varying shots and have a good look at them on the PC. The older odd branded lenses I've tried seem OK on a DSLR, it may be because distortion at the edges misses the sensor.
Posted by Hardgravity on 31/03/2010 - 17:11
Lens fungus
I found vinegar quite effective, mind you the alcohol-based computer screen cleaning spray also seems to do the trick and is more commonly found here (nobody in this house likes vinegar). Just spray it on the fungus and swab with a cotton bud.
Posted by Dangermouse on 09/04/2010 - 23:49
Woooo, just bought a DA* 50-135mm!
While the IQ is great - it's not going to replace my mirror lens At least not for big zooms I remember reading somewhere that mirrors were so terrible that you could just crop and manipulate a high quality 135mm lens to get the same out of it. Well, I tried. These pictures at: 18mm to show approxim...
Posted by Oggy on 26/04/2010 - 22:54
Woooo, just bought a DA* 50-135mm!
Not really a fair test. The crop you show will have nearly 16 times as many pixels in the 500mm format as it does in the 135mm format. For distant objects there is no real substitute for longer focal length. If you were to compare pictures which occupies for the sake of argument, half the width of t...
Posted by whelmed on 28/04/2010 - 16:03
I want to do this ... which lens please?
I love This is a 16-35mm lens on a 5D at 17mm. That's a FF camera sooo, am I looking at a 11-12ish mm on the K-7 sensor? The fisheye 10-17? I know the picture was taken in the future. Probably by the man arrested near the large hadron collider. Thanks
Posted by dougf8 on 05/04/2010 - 16:57
I want to do this ... which lens please?
...This is a 16-35mm lens on a 5D at 17mm. That's a FF camera sooo, am I looking at a 11-12ish mm on the K-7 sensor? The fisheye 10-17?... DA* 16-50 at 16mm f2.8 :D :lol::lol::lol:
Posted by Oggy on 05/04/2010 - 21:21
I want to do this ... which lens please?
...This is a 16-35mm lens on a 5D at 17mm. That's a FF camera sooo, am I looking at a 11-12ish mm on the K-7 sensor? The fisheye 10-17?... DA* 16-50 at 16mm f2.8 :D :lol::lol::lol: Errrr, nope.
Posted by dougf8 on 05/04/2010 - 21:36
I want to do this ... which lens please?
It doesn't have to be a zoom. But as you say the picture is distorted. If you look at the edged the brick joints are pretty awful. The centre of the pic is sharp. The exposure was 0.8S which would account for the brickwork blurring but the flash creates the sharp centre. I don't really want t...
Posted by RR on 06/04/2010 - 12:30
50mm 1:2 on Ebay
I have both M and A versions of the f1.7 and the f2, must do a comparative test sometime. I went through a phase of picking up cheap mouldy 50mm f2s and cleaning them out to go with some film bodies, only paid about £5 each for three of them. There is a bit of dust inside now, but they took perfect ...
Posted by Dangermouse on 09/04/2010 - 12:47
Strange focusing
Well the sensor (photo) is the deciding factor here because you can't move that. 1) use AF and take a photo - you can then see if you need to adjust the AF or not 2) use manual focus (split-prism screen) and take a photo - if the DOF is off you know you need to use shims to adjust that. ps. i...
Posted by Anvh on 08/04/2010 - 14:16
UWA Primes - 14mm or 15mm?
The K15mm is totally wasted on a cropped sensor just as the 28mm shift is. Regards
Posted by K10D on 07/04/2010 - 22:22
UWA Primes - 14mm or 15mm?
The K15mm is totally wasted on a cropped sensor just as the 28mm shift is. Regards I have both of these lenses and I would disagree. With that line of thought I suppose my 16mm A series fisheye is in the same category :wink: I still get great shots with all of these lenses. There is the fact...
Posted by mayday on 07/04/2010 - 23:12
UWA Primes - 14mm or 15mm?
The K15mm is totally wasted on a cropped sensor just as the 28mm shift is. Regards You'll notice mine is attached to a KX... ;) I wasn't suggesting the OP bought one, I was just agreeing that it is a hefty bit of glass. I like it though, and as the 12-24mm vignettes horribly on 35mm film I wi...
Posted by womble on 08/04/2010 - 00:30
Objective?
However if we talk about models we talk about subjects so can't we call the objective a subjective then? :D So... The objective of the shot is the subject. The light passing from the subject, passes through the objective onto the sensor. My brain hurts!!
Posted by Father Ted on 08/04/2010 - 22:42
Objective?
It might be that the objective lens needs to be one of a series? For eg a magnifying glass on its own, as an individual lens, perhaps wouldn't qualify. That's where I was coming from. I had a rummage round on the internet and couldn't find reference to a subjective lens ( I definitely remember h...
Posted by Father Ted on 09/04/2010 - 08:36
