Search results for 'sensor cleaning' - page 149
Samyang 14mm f/2.8 ED AS IF
there's a couple flickr groups for this lens - discussion here which mentions the distortion: http://www.flickr.com/groups/samyang_14mm/discuss/72157623928811718/ May be worth mentioning that the users in that thread have full frame cameras. On a crop sensor, the distortion is less of an issue. ...
Posted by Pentaxophile on 15/10/2012 - 23:58
Tilt/Shift lens
I tried my SMC 28mm shift on a cropped sensor. Waste of time. Wether the tilt will improve the results or not has yet to be verified. Best regards
Posted by K10D on 25/09/2012 - 00:12
"It's all about the glass". Show me examples please
I understand, I know that the K-5 brought significant gains in its high iso performance, and the burst rate increased, and maybe other sensor related improvements. But the importance of these depends on an individual's style and technical needs. I don't make use a lot of ISO 800 or above (you could ...
Posted by McGregNi on 15/09/2012 - 19:29
"It's all about the glass". Show me examples please
So it would not make financial sense upgrading from K7 to K5, all else being equal - I think most photos would look exactly the same if shot on either. Couldn't disagree more. Upgrading from a K20D ( which was similar if not the same sensor as the K ) was a huge increase in IQ ast ALL ISOs. the inc...
Posted by Smeggypants on 16/09/2012 - 02:55
I was just wondering....
Hi, the question still remains, what will happen to the DA lenses specially made for the APS-c size. I can see 2 scenarios: 1.) The full frame Pentax has a list of these lenses and only the APC equivalent size of the sensor is addressed, as mentioned by Don. However the advantage of the full f...
Posted by Horst on 17/09/2012 - 12:55
I was just wondering....
As I understand it (I've always assumed), if you stuck a DA APS-C lens on a FF camera, then you'd have black space around the edges, because the image projected is a smaller circle than the sensor is recording. Pentax may be the only brand that this could be tested on I think, because the other bran...
Posted by McGregNi on 17/09/2012 - 18:34
E Ludwig Meritar f/2.9 50mm
I have recently acquired one of the above and it is cosmetically in poor condition. I believe it is made from aluminium in part, and I would like to clean it up. Does anyone have experience of this lens, and of cleaning it successfully please? It fits on my K100D via M42 adapter and takes...
Posted by 9erfan on 18/09/2012 - 22:49
Problems with M lens
Tony, try to negotiate with seller. I once bought Carl Zeiss with fungus inside. Seller either didn't inspect the lens properly when describing its condition or didn't mention it by intent, I don't know. But he was allright to pay for dissassembly and cleaning of the lens....and that made a deal rea...
Posted by kingfisher on 21/09/2012 - 13:13
TAMRON SP 90MM MACRO F2.5
This lens is my favourite and a pure joy to use. The one caveat to this is the purple spot ( that Dr O mentions) that can appear when the lens is stopped down. It is sensor flare, a reflection from the flat surface of the rear lens element. It can show from f8, but does depend on the contrast with...
Posted by moose on 24/09/2012 - 13:53
TAMRON SP 90MM MACRO F2.5
This lens is my favourite and a pure joy to use. The one caveat to this is the purple spot ( that Dr O mentions) that can appear when the lens is stopped down. It is sensor flare, a reflection from the flat surface of the rear lens element. It can show from f8, but does depend on the contrast with...
Posted by OldTaffy on 24/09/2012 - 15:37
TAMRON SP 90MM MACRO F2.5
Is it reflection off the rear lens element, or off the rear of the diaphragm? I rather guessed the latter, because it gets worse at the diaphragm closes. The rear element and reflectivity of the sensor is the problem. It is refered to as sensor flare. As I understand it, a sensor is more reflecti...
Posted by moose on 24/09/2012 - 22:28
TAMRON SP 90MM MACRO F2.5
The sensor flair purple spot has varied across bodies for me. Fine on the K100D, showed up on the K-7 ( where the 300/5.6 showed it much more)and the K-5 no issue
Posted by Transit on 25/11/2012 - 04:57
Views of the 18-250mm
As a travel lens the 18-250 hits the spot. But, there's always a but, I found that on my K5 it needs stopping down to f8 or slower in bright lightto avoid burnt out detail/washed out colours. I didn't have this problem on the K200, just a sensor thing I guess, you pays your money etc.
Posted by Hardgravity on 24/09/2012 - 20:13
Pentax K 85mm f1.8; Ideas On Value
Why not give Asahi Photo a call and ask how much cleaning the diaphragm would cost? That would give you an idea as to what to negotaiate as a partial refund from the seller.
Posted by johnriley on 06/10/2012 - 09:47
lens confusion..
hello all, just a question. Are modern pentax lenses made for a crop sensor or full frame?? i want to buy a 50mm prime. Will the DA 50mm 1.8 be an actual 50mm or a 70+ mm?? if the latter, the DA 35mm 2.4 AL will be the closest perspective to a 50mm on a full frame right?
Posted by jkdlee on 12/10/2012 - 13:37
lens confusion..
The explanation I read was that the format covered by Pentax DA lenses was generally a generous APS-C, so this makes allowance for movement of the sensor as it shifts for SR. This is not the same as them covering a full frame area.
Posted by johnriley on 12/10/2012 - 14:23
lens confusion..
Ah ha - a good point John, for this reason Pentax's 'cropped' lenses have to project a slightly bigger image circle than some other brands. And lets not forget also the 'Horizon Adjustment' and 'Auto Horizon Correction' features!:wink: Acutally, I think I noted when buying the camera that the Pen...
Posted by McGregNi on 12/10/2012 - 16:36
When the FF Pentax comes out, what lenses can you use from day one?
Worth remembering that digital cameras require the light to be travelling at right angles to the sensor, lenses designed for film don't have this restriction so everything in the garden may not be as rosy as it seems.
Posted by gartmore on 13/10/2012 - 09:54
When the FF Pentax comes out, what lenses can you use from day one?
Worth remembering that digital cameras require the light to be travelling at right angles to the sensor, lenses designed for film don't have this restriction so everything in the garden may not be as rosy as it seems. Well said. A positive post. The Canon 5d owners that use the Pentax Ltd's are so d...
Posted by K10D on 13/10/2012 - 12:06
When the FF Pentax comes out, what lenses can you use from day one?
Depending on the design, it could well be that any FF DSLR would automatically change to APS-C format (using only part of the sensor) when DA lenses are attached. It is conceivable this could apply to the viewfinder view as well. So discussions that rage about whether or not DA lenses are compati...
Posted by johnriley on 13/10/2012 - 13:07
