Search results for 'sensor cleaning' - page 142
Portrait lenses above 50mm
I have a 50mm FA 1.4 that I really like but I cannot use it for head shots as it will give some perspective distortion. I need something a little longer that will land me right in the perfect focal length range of around 85mm. So working that back I would need something around 57mm on my crop sen...
Posted by Daydreamjay on 01/01/2012 - 20:46
Portrait lenses above 50mm
Hi Jak, I'm using a K5 so it's a cropped sensor so the 50mm is a 75mm equivalent. At this focal length I will get a small amount of distortion to the face and it is quite noticeable on the nose. It's not far off being OK but not quite good enough. I don't want to shoot from further away and crop ...
Posted by Daydreamjay on 02/01/2012 - 02:42
Portrait lenses above 50mm
Or is it 50mm = 50mm = 50mm, whatever the crop factor? This is correct as I understand it. With a cropped sensor you get the central part of the full-frame image, so any distortion visible in the central region of the full frame image will present in the image captured by the cropped sensor.
Posted by sorted78 on 02/01/2012 - 05:58
Portrait lenses above 50mm
Yes, at 50mm on a crop sensor the distortion is just about disappearing, but can still play havoc with facial features and can be unflattering. I just need something a bit longer but not that long that I am restricted with movement if in a tight environment. Very interested in the Voigtlander...
Posted by Daydreamjay on 02/01/2012 - 20:13
FA50mm F1.4 queries
It is wonderful for portraits. It's worth considering the direction of light to minimise CA. There are CA removal tools in various processing programs. It benefits from a nice deep hood as well. I think the older lens coatings are not so well tuned to the digital sensor. I would recommend stopping i...
Posted by Transit on 01/01/2012 - 23:49
FA50mm F1.4 queries
Any thoughts. I had hoped to use this as a portrait lens but I see another post reckons there's too much distortion. Is this true? You will have some perspective distortion creeping in if you shoot a head shot, but it's not a bad portrait lens. Check out this link and look at the images attache...
Posted by Daydreamjay on 03/01/2012 - 00:40
Long Lenses - again! Sigma 300mm v DA*300mm
On holiday to mainland Greece last May we were spoilt for choice with dragonflies and butterflies in every direction. With my wife and I was a pro photographer friend of 40 years experience getting to grips with a telephoto lens on his 'full frame' sensor DSLR. He's more used to landscapes and ou...
Posted by wvbarnes on 05/01/2012 - 13:35
Long Lenses - again! Sigma 300mm v DA*300mm
He was also hampered by his 300mm not being 450mm equivalent of course! Apart from any sensor resolution differences, he could crop to give the same FOV since there would be no difference of subject size. Are you sure he was a pro? Then again, maybe it's the result of weak school curriculum nowadays...
Posted by K10D on 05/01/2012 - 19:39
Tameron/Pentax
I think two very important points have been left out: a) the Sigma 70-300 is a Full Frame lens while the DA 55-300 is NOT. The DA55-300mm is FF compatible, as are a few of the other DA lenses :wink: These lenses will lose the sweet spot advantage, but a larger sensor will be beneficial to the res...
Posted by Pentaxophile on 17/01/2012 - 18:21
SMC PENTAX-FAJ 75~300mm F4.5~5.8 Telephoto ZOOM LENS AL AutoFocus for Pentax DSLR
Try the K5 in TAv mode John, it's brilliant with long lenses, you'll be able to keep the shutter speed up AND control the aperture at the same time, you can keep an eye on what the ISO is doing in the viewfinder and adjust aperture or shutter if it gets too high. JR mentioned that lens not been a...
Posted by fatspider on 21/01/2012 - 11:13
portrait lenses
DA*55 1.4 - Designed for portrait on the Aps-c sensor... I'd love one!!
Posted by DaveHolmes on 22/01/2012 - 00:01
portrait lenses
DA*55 1.4 - Designed for portrait on the Aps-c sensor... I'd love one!! What would you have to pay for one of these? £400 .. or more?! 84mm equiv FL ideal for portraits, and with f1.4 has to be perfect. Rich S
Posted by maurisimo on 22/01/2012 - 12:32
Relationship between lens sharpness & sensor size.
I have recently bought the Pentax DA 35mm 2.4 AL lens that John Riley reviewed. I am wondering if the 6 megapixel sensor of my camera can do full justice to the sharpness of this lens. The few shots that I have taken do not appear much sharper than the kit lens but I haven't been able to test it in ...
Posted by Pikaholic on 25/01/2012 - 21:05
Relationship between lens sharpness & sensor size.
The problem is, the kit lens is respectably sharp stopped down, and 35mm is its sweet spot! You're probably right that any difference would be more pronounced on a higher resolution sensor. However I don't buy primes primarily for extra sharpness - wider *usable* maximum apertures, small size and ni...
Posted by Pentaxophile on 25/01/2012 - 21:21
Relationship between lens sharpness & sensor size.
I've found the DA 35 2.4 AL to focus faster, and to have sharper corners (surreal even) than the kit lens. I also like how small it is, and very light. Certainly a good walk-around lens that makes you think for the shots you want to take, in the process coming up with something creative.
Posted by Opethian on 25/01/2012 - 22:27
Relationship between lens sharpness & sensor size.
The problem is, the kit lens is respectably sharp stopped down, and 35mm is its sweet spot! You're probably right that any difference would be more pronounced on a higher resolution sensor. However I don't buy primes primarily for extra sharpness - wider *usable* maximum apertures, small size and ni...
Posted by TheVicar on 26/01/2012 - 20:18
Relationship between lens sharpness & sensor size.
Your results are probably reaching the limit for the 6M sensor. Both lenses are top notch anyway and my copy of the 35mm f/2.4 is slighty softer wide open, but pin sharp from f2.8 upwards on a K-5 at 100ISO. I would expect the kit lens to be slightly softer than the 35mm in the corners and ...
Posted by Algernon on 26/01/2012 - 20:57
Relationship between lens sharpness & sensor size.
Thank you each for your helpful comments. I have also been reading the thread "NOT Happy with my DA 35 f2.4 lens" and the problems that people have experienced. I think if I had known all this I would not have bought the lens but I must take some more shots following your advice and post some for yo...
Posted by Pikaholic on 26/01/2012 - 21:16
Relationship between lens sharpness & sensor size.
If your lens is genuinely 'duff' you should be able to take it back to Jessops, no bother. Stick at it for a bit though. Try it for some wide aperture portraits for example. If it's missing focus, try manual or live view focusing... If that gets you a better result (neither are affected by front or ...
Posted by Pentaxophile on 26/01/2012 - 21:27
Relationship between lens sharpness & sensor size.
I've been out today taking some test shots that I will now include. The images ..916 and 926 are from the 35 f2.4 lens and ..917 and 931 from the kit lens. The full image first & then the 100% crops. Help! I can't work out how to add the image to this place marker. Sorry.
Posted by Pikaholic on 27/01/2012 - 16:43
