Search results for 'sensor cleaning' - page 135
Help me choose
It's well known that the 16-45mm is better below 24mm than the 18-55m after that they are similar. You can see the PF on the 16-45 though. The 18-55mm doesn't look in focus ( look at the downspout ): Hmmm... the shots were at f8 and live-view focussed on the same spot. Could it a be curved-field eff...
Posted by Pentaxophile on 06/07/2011 - 20:00
Help me choose
Both the MkI & MkII kit lenses are decent lenses, however I believe Pentax were right in updating the optical formula as the sensor resolution increased. I still have the 18-55 and used it a couple of years ago on a holiday in Scotland with good results, it was the only lens I took. Optically Nikon ...
Posted by johnwhit on 06/07/2011 - 20:18
Help me choose
Both the MkI & MkII kit lenses are decent lenses, however I believe Pentax were right in updating the optical formula as the sensor resolution increased. I still have the 18-55 and used it a couple of years ago on a holiday in Scotland with good results, it was the only lens I took. Optically Nikon ...
Posted by vrapan on 06/07/2011 - 21:09
8-16 Sigma soft?
Mine isn't. :) Likewise - for that I could use a P&S with a sensor the size of my little finger nail... Regarding the OP's question, the Sigma is very soft at f22 due to diffraction. At wide apertures it is sharp although it does benefit from stopping down a couple of stops.
Posted by karma mechanic on 09/07/2011 - 10:04
Is my 40mm backfocusing
We've always had inconsistencies, but prior to being able to view huge magnifications on screen it hasn't really been a problem. Likewise, we now have very complex zoom lenses and no doubt that does not help either. With film the problem was film flatness, but thankfully at least a sensor is almo...
Posted by johnriley on 11/07/2011 - 08:02
Is my 40mm backfocusing
We've always had inconsistencies, but prior to being able to view huge magnifications on screen it hasn't really been a problem. With film the problem was film flatness, but thankfully at least a sensor is almost certain to be at least flat. I hope.... Being able to pixel-peep at magnifications ...
Posted by johnwhit on 11/07/2011 - 09:08
Is my 40mm backfocusing
With film the problem was film flatness, but thankfully at least a sensor is almost certain to be at least flat. I hope.... ANd that's also a reason you see it better on digital. The thickness of the lightsensative area of a sensor is very small but the grain with films had some thickness to them s...
Posted by Anvh on 11/07/2011 - 10:18
Broken Sigma 28-300 "Lense"
It's definitely worth the time, assuming you got it cheaply enough. I will say though that AF zooms are seriously complicated - I've only managed to repair one so far and that was (thankfully) a simple matter of unscrewing the front element and cleaning the inside surface of it. I did have a 28-70mm...
Posted by Dangermouse on 12/07/2011 - 15:45
Which Limited lens?
I remember that test. Part of the interest now, an important part, is how that relates to the different requirements of the digital sensor.
Posted by johnriley on 14/07/2011 - 13:43
Sigma 50 1.4 from Microglobe
It's an electronic instruction to a mechanical device. There must be feedback to say "I've arrived at the point of focus" but of course there will be mechanical tolerances. That's the point Smeggy is making. How does the lens say it has got there? Surely the camera decides when focus is achieved,...
Posted by Anvh on 17/07/2011 - 18:26
Fisheye lenes
I think he means that it fills the whole sensor so not an circular fisheye.
Posted by Anvh on 17/07/2011 - 22:45
Fisheye lenes
So much for humor. Don't worry the humor was noted.:D So if I pick a focal length, say 10mm, will a normal wide angle and a diagonal fisheye have the same AOV? No, Rectalinear lenses loose some degrees due to correction. F.e. Pentax DA10-17 has diagonal FOV of 180 degrees os APSC sensor a...
Posted by axl on 18/07/2011 - 07:55
Best focal length for party portraits?
Hi All, I'm looking for a reasonably fast budget prime for head & shoulder portraits at a party (indoors in a normal sized house). I don't want to be in peoples faces (or suffer from the weird pespective this can create) but I also don't want to be backing up half way across the room and getting...
Posted by thespirit3 on 27/07/2011 - 14:42
Noktor 50mm f/0.95
the page and the lens is at least 2 years old and nothing happened in that time. i dropped an email with k mount suggestion long time ago. it is also made for small sensor and shorter flange distance, and not suitable for dslr. nice to dream about it, but don't think it is possible and it will eve...
Posted by jane7l on 28/07/2011 - 23:54
Help with choosing a lens - looking at 50mm f1.4
Indeed 50mm are cheap but if you don't use it they are still expensive. Get a lens that match with your kind of photography and shooting and not the other way around. 50mm was on film the standard lens you could use for almost everything but because we use a smaller sensor 35mm is now the equiva...
Posted by Anvh on 03/08/2011 - 18:27
Help with choosing a lens - looking at 50mm f1.4
You'll also find some debate as to whether fast glass is actually of benefit on DSLR's. I could never take such a debate seriously. The only serious debate IMO is whether a fast lens is of benefit to a particular photographer I love shallow DOF creamy wide open shots and that's why I bought a P...
Posted by Smeggypants on 03/08/2011 - 23:00
Help with choosing a lens - looking at 50mm f1.4
I echo the comments regarding 50mm vs 35mm, I initially bought an FA50mm 1.4 and it's an excellent lens - the problem was I found on the cropped sensor it was just a bit too long for my needs so sold it and bought the FA 35mm F2, I find it a more useable focal length. Simon
Posted by simonkit on 04/08/2011 - 08:56
Help with choosing a lens - looking at 50mm f1.4
I'm looking to shoot product images for my website, flowers, people, street/general photography. I've shot flowers and people with primes from 21 through 31 and 40 mm, to 50. They all work fine. If it's outdoor shooting (and it seems that you are by your post) and bokeh you're after, and you'...
Posted by i-Berg on 05/08/2011 - 12:51
Samyang 24mm f1.4
A quote from DPR: "24mm focus is tailor-made for most of the sensors available on the market today. In the case of full-frame cameras, it constitutes a high-quality wide-angle lens perfect for street, landscape and architecture shooting. Whereas photographers using DX sensors will get just perfec...
Posted by K10D on 13/08/2011 - 01:40
Samyang 24mm f1.4
Perceptions change of course and it's time we ditched the "35mm equivalent" notion perhaps. Probably right John as far as Pentax DSLR's are concerned. The other three players don't need to. Maybe better to use FOV as it covers all sensor sizes. It's a big lens, but getting the FF equivalent of 35...
Posted by K10D on 13/08/2011 - 13:22
