Search results for 'sensor cleaning' - page 160
Why bother?
I think his point is that you have to enlarge/magnify you image more than he does (with a FF sensor). I may not have explained what I meant quite as well as I intended, so I will try again. Let's suppose that I have a 24 mp APS-C camera and 300mm f/4 lens fitted. My mate has a notPentax 24 mp...
Posted by andrewk on 20/07/2014 - 01:12
Why bother?
Andrew wrote: Let's suppose that I have a 24 mp APS-C camera and 300mm f/4 lens fitted. My mate has a notPentax 24 mp full frame camera. If we both want to take the identical subject, filling the frame in the same way, he will have to use a lens that is 1.5x longer if we stand at the same locatio...
Posted by Horst on 20/07/2014 - 01:24
Why bother?
I don't see it as being sensor related, rather its solely about lens focal length and the resulting perspective effects of different lengths ... These two factors are exactly the same on both formats. Andrew and his friend standing together shooting the same thing each with a 300mm lens will record ...
Posted by McGregNi on 20/07/2014 - 08:39
Why bother?
Andrew, just imagine if you had a sensor half or a quarter the size of Your APS-C sensor, You could get away with a 50mm lens and fill the frame. Regards, Horst
Posted by Horst on 20/07/2014 - 10:07
Why bother?
Blythman wrote: Assuming that the AF point is the same size on each sensor then, it can be more accurately set on APS-C. So you might have the eye in focus with the crop and out of focus with the FF as on FF it covers a larger area of the animal Hello Alan. Focus is only 2 dimensional, forget d...
Posted by Blythman on 20/07/2014 - 10:31
Why bother?
Alan wrote: With the same size sensor, its like focusing on an animal (say a bird, 6 metres away) with a 300mm lens. and then from the same distance focus on the same bird with a 200mm lens. Assuming you want the eye sharp, and all other things being equal,which lens do you think would give you t...
Posted by Horst on 20/07/2014 - 10:37
Why bother?
Alan wrote: With the same size sensor, its like focusing on an animal (say a bird, 6 metres away) with a 300mm lens. and then from the same distance focus on the same bird with a 200mm lens. Assuming you want the eye sharp, and all other things being equal,which lens do you think would give you t...
Posted by Blythman on 20/07/2014 - 11:03
Why bother?
What I don't understand is why the reference to the 35mm is given on a lens which is specifically designed for APS-C. Why would anyone give a hoot what the lens would be on 35mm if it is and can only be used on APS-C? I might give a hoot if someone can kindly answer this question for me. Back in...
Posted by Lü on 22/07/2014 - 05:45
Why bother?
If you used a 100mm lens with your film camera, why not use an other 100mm lens. one which is marked 100mm, because it is not usable for film and because it is specially made for APS-C. The problem with this is that you'll have to stand farther back if you want the image to occupy the same amount of...
Posted by Lü on 25/07/2014 - 10:06
Anyone using FF WA lenses?
I must admit, I have shied away from buying any 'aps-c' glass since getting the 18-35 with the camera ... My only other new purchase has been the Samyang 14mm, with a FF image circle. In the back of my mind was its future use as an ultra wide on FF ... The other lenses are all FF by default purely...
Posted by McGregNi on 29/06/2014 - 21:33
Anyone using FF WA lenses?
I must admit, I have shied away from buying any 'aps-c' glass since getting the 18-55 with the camera ... My only other new purchase has been the Samyang 14mm, with a FF image circle. In the back of my mind was its future use as an ultra wide on FF ... The other lenses are all FF by default pure...
Posted by McGregNi on 29/06/2014 - 21:34
Sigma 18-35 f1.8
Does someone want to use this lens for portraits? Surely they'd be better off with something in the 50mm - 70mm range on an APS-C sensor The Sigma 35mm f1.4 has become a popular lens for wedding photographers. Used at 24mm I can see how the 18mm-35mm could be handy too.
Posted by mikedefieslife on 15/08/2014 - 11:36
Advice on Tamron 28-75 f2.8
Ahoy! It's good, but nothing stellar. That FF lens needs a matching body otherwise it's wasted on APS-C as you don't get the full width. A better fixed aperture option is the Tamron 17-50/2.8 Di-II, though personally I found the Sigma AF 17-70mm F/2.8-4.5 DC Macro to be more versatile as rarely...
Posted by PIRATE on 21/07/2014 - 01:12
The need for a lens hood.
Also of course with the APS-C sensors a 1.5 times longer lens hood can be used. Why? Surely the focal length of a lens remains unchanged regardless of sensor size. Roger
Posted by cbrog on 05/08/2014 - 13:25
The need for a lens hood.
One for the books - Attended a seminar given by a professional National Geographic Photographer - I asked "besides flare,why use a Lens hood?" he said - The sensor in camera is square, the lens is round. a square hood "helps square " the incoming light. --- was he joking or any technical back up for...
Posted by drobbia on 05/08/2014 - 22:13
The need for a lens hood.
Except the sensor isn't square....but then neither is the hood. Petal shaped hoods are the most efficient and we can test this with the 12-24mm hood. When I first got this lens the hood wasn't clicked totally into position and sure enough I got vignetting. It was utterly precise. When clicked fully ...
Posted by johnriley on 05/08/2014 - 23:53
SR in Lenses
The new DA645 28-45mm lens is very interesting - the first Pentax lens with SR in the lens. There don't seem to be many fanfares about this, but maybe it's because of the size of the medium format sensor or maybe it's because medium format DSLRs and wide angle lenses need different solutions. I w...
Posted by johnriley on 05/08/2014 - 15:48
SR in Lenses
As the sensor size of the Pentax 645Z is roughly 1.7x larger than 35mm-format, full-frame image sensors, perhaps the movement of SR unit is just to great like you state John. Perhaps another aspect is that if they are manufacturing new lenses for the 645Z it makes sense to build image stabilisati...
Posted by Fletcher8 on 05/08/2014 - 17:07
Why was an approx 70mm lens considered ideal for portraits?
John did not say, that the 50mm lens with an APS-C camera is the same as a 75mm lens with a Film (FF) sensor. Else there would have been no need with a FF to have the longer focal length and just crop it. The perspective is different between the 2 original focal length , 50mm vs75mm. AS I ...
Posted by Horst on 09/08/2014 - 23:56
Why was an approx 70mm lens considered ideal for portraits?
Horst, the focal lengths I quoted were the ones used on 35mm film cameras. That's why, on an APS-C sensor, I would use a 70mm lens for portraits. This equates to the 100mm one I used on film very closely.
Posted by johnriley on 10/08/2014 - 00:12
