Search results for 'sensor cleaning' - page 107
Has anyone used a Pentax A on a K10D?
Yes it was made for a 35mm film camera I have the A50mm 1.7 but it is still a 50mm lens, you only convert it because the sensor is smaller than film which makes it 75mm in digital but the actual lens is a 50mm so that's what you tell the camera, I also have a M28mm and a M40mm but I tell the camera ...
Posted by jackitec on 22/07/2009 - 20:52
Has anyone used a Pentax A on a K10D?
Caz, It would be reasonable to apply the 1.5x crop factor as your angle of view with the smaller sensor does indeed appear to 'increase' your focal length by 1.5. A 50mm lens is still a 50mm lens though. Pentax have tried to make it easy for us with entering the settings, no need to do any mat...
Posted by fiish on 22/07/2009 - 20:55
Focusing
Generally I use manual focus for macro shots as I don't want the camera to try and refocus every time I'm ready to make the exposure. If I do use AF, then I still use centre spot and use the Quick Shift to readjust as I require. May I mention that you mean Depth of Field, not depth of focus, whic...
Posted by johnriley on 26/07/2009 - 14:50
Auto Chinon 50mm 1.9 ???
I expect it's pretty good on a smaller sensor but I don't think Chinon were ever first tier lenses. They certainly were not so well regarded as Pentax, Nikon, Minolta etc. in their day. Now I confidently await to be proved wrong! It always surprises who makes which lens and then who brands it! ...
Posted by mikew on 27/07/2009 - 21:40
Macro lens?
Here is some advice on macro lenses I posted in another thread, hopefully it will help you make the right choice to suit your requirements; "A macro lens achieves a ration of 1:1, meaning the image on the film or sensor is the same size as the object being photographed. Another important disti...
Posted by jon.dc on 29/07/2009 - 08:48
Sigma 28-70mm F2.8 EX DG
I thought about getting that lens but went for the Tamron 28-75 f2.8 instead. I can't compare the two but I am really happy with my Tamron and it is also full frame so using it on my new film camera to get 18-50 equivalent. Think you got your crop factors mixed up a little there! A 28-75mm full fram...
Posted by Unlocker on 31/07/2009 - 12:17
Sigma 28-70mm F2.8 EX DG
I thought about getting that lens but went for the Tamron 28-75 f2.8 instead. I can't compare the two but I am really happy with my Tamron and it is also full frame so using it on my new film camera to get 18-50 equivalent. Think you got your crop factors mixed up a little there! A 28-75mm full fram...
Posted by ericp on 31/07/2009 - 13:41
Are all mounts equal?
To a certain extent yes, but remember that all cameras are different so what may be a punchy, saturated photo on a Canon is probably more due to the characteristics of Canon than the lens, though the reviewer, not having tried the lens on a different mount, may not realise this. Also what may work w...
Posted by Gwyn on 05/08/2009 - 12:16
the range
Oh yes they make DSLR they even use a special sensor, the camera are even pretty good I believe. :) The Sigma 170-500mm is now discontinued and replaced by the 150-500mm. The Sigma 170-500mm also had a smaller brother the 135-400mm and that one is replaced by the smaller brother of the 150-500mm...
Posted by Anvh on 15/08/2009 - 21:19
other lenses
DA lenses are for digital and most have reduced image circles, so will vignette to a greater or lesser degree on film. FA and F lenses are fully useable on digital, some will perform adequately but others will be superb. This depends on whether the original lens design produces an image that is s...
Posted by johnriley on 17/08/2009 - 08:15
Canon to Pentax converter
Hi Stefan, I have found the . It is a ten page thread with some excellent pictures shown as a example. It gets interesting from posting number 45 at the end of page three. Sometimes it gets a bit heated but general consensus seems to be pointing into the direction I mentioned. In comparison s...
Posted by Malo1961 on 26/08/2009 - 21:19
Canon to Pentax converter
Hi Stefan, I have found the . It is a ten page thread with some excellent pictures shown as a example. It gets interesting from posting number 45 at the end of page three. Sometimes it gets a bit heated but general consensus seems to be pointing into the direction I mentioned. In comparison s...
Posted by gartmore on 27/08/2009 - 08:03
Whats the difference
In 35mm film photography any lens greater than 50mm was considered to be telephoto. I supose that with a sensor crop factor of 1.5, then this would now mean that over approx 33mm is telephoto. A zoom lens has an infinately adjustable focal length, between its range.
Posted by grahamwalton on 26/08/2009 - 14:46
Whats the difference
I've also heard 'long focus' used in reference to plate cameras but these are actually long focus rather than telephoto. What's the difference between these? A long focus 500mm lens will have 500mm back focus but a tele will have a shorter back focus making it more compact. The long focus lens ne...
Posted by lemmy on 27/08/2009 - 16:01
help: dropped a lens, what can i do
Thats interesting .. thanks for that. I suspect it would be worth me subscribing when I send my K10D for the sensor to be fixed. It's about time anyway, I have learned a lot from this forum.
Posted by Mike-P on 06/09/2009 - 10:02
prime lenses
EFOV is effective field of view in relation to 35mm (or full frame), this takes into consideration the crop of the smaller APS-C sensor, ie what is seen by the sensor in relation to the image that the lens sees. However, a 50mm lens will still act as a 50mm lens, even though the camera sensor is ...
Posted by Offertonhatter on 03/09/2009 - 22:25
Macro different mm
[quote:3496ace15f="Malo1961 for instance: a coin with a diameter of 2 cm will be reproduced exactly the same size. Martin. [/quote] same size on the sensor/film !? Yes? So it is on BIG on paper/screen.
Posted by Aiki on 09/09/2009 - 06:33
Macro different mm
Unlike most "standard" lenses though you can just keep moving closer, and closer, and closer to your subject - until the front element is almost touching it in fact. This gives you the option of being able to take some very interesting perspectives in your everyday photography and it's great with fl...
Posted by hefty1 on 09/09/2009 - 15:46
50mm Lenses
MTF is modulation transfer function, an electronic way to express resolution. A target which cosists of black and white patterns starts off as having 100% contrast. A machine can read the image at the film/sensor plane to see how much of that contrast gets through the lens intact. If the figure was ...
Posted by johnriley on 09/09/2009 - 12:27
Advice on upcoming lens purchase
Hello again! I see that Rich's comments are absolutely correct; check your current pictures and the approximate focal lenght to see what its like to have one or the other lens. I did to this excercise with a super-zoom, just before buying the DA*. I went out for a few days, and only shot in the 5...
Posted by nathanever82 on 10/09/2009 - 09:59
