Search results for 'sensor cleaning' - page 127
interesting Tokina
it is a strong performer optically.. imagine a wr version with Pentax badges on it...:wink: I suspect this is the first of the new Pentax line... Hopefully Pentax will release a body with a sony or samsung ff sensor and pelicile mirror or evf "Evil on Steriods" design to go with it!:shock:
Posted by Don on 02/01/2011 - 19:10
A bottle of port later... (SMC 50mm 1.7 M content)
Odd - I had a brief go with the deep red IR filter on my K-m with kit lens when I got it but couldn't get anything other than blackness! I'll try it again sometime. I rather assumed that there was an IR filter in front of the sensor which blocks attempts to take such photos with a DSLR. My techn...
Posted by Dangermouse on 05/01/2011 - 23:38
16 - 50 DA* or 50 - 135 DA*
Thanks for replies. I completely understand the crop comment re the 50-135 v 70-200 but these guys are also shooting crop sensors ! Appreciate comments about crowd control, we have a few other family and a 50th birthday with 120 guests to practice on but this is definately a weak area that needs ...
Posted by testbloke on 09/01/2011 - 21:24
17-50 or 18-135 for beginner
By the way... Checking the spec of the , it appears that (ignoring the 4:3 sensor size), its zoom range gives an angle of view equivalent on 35mm to 35-210. On the K5, a zoom range of about 23-140 will give you a comparable angle of view. The OP may want to bear this in mind, if he hasn't ...
Posted by ChrisA on 14/01/2011 - 15:50
17-50 or 18-135 for beginner
I'd add a vote for the WR kit lens, then the Tamron. I think that having a fast lens is useful for the narrow depth of field, even though the ISO performance of the K-5 means you don't necessarily need it for available light shooting indoors. I've found the kit lens to be much better than you'd ...
Posted by bwlchmawr on 27/07/2016 - 06:59
Stubborn lens hood - help
I've had similar problems with my 16-45 and after cleaning the black grime off it fits fine. (It would appear to be very fine worn plastic) Not really bothered me as it fits fine after cleaning. Regards George
Posted by carmagw on 19/01/2011 - 11:49
The Sigma 30mm f1.4: I'm with Smeggypants!
Cheers Jules - I'll spend some time with the eyes at some stage. I know for portraits 50/55 on a cropped sensor is the best to use to reduce distortion; but for me I find that focal length is just a tad too telephoto for general purpose. Yes this will be my main portrait lens; but I do want it to...
Posted by Snootchies on 26/01/2011 - 21:12
Budget Prime?
30mm or 35mm, which lens gives the more natural perspective?, and are they physically a lot different to each other? The 35 is tiny, light and has a plastic mount - the 30mm is reasonably compact, but not small. Of course, the 30mm has a lot more glass - it's a 1.4 compared to a 2.4. The diagonal ...
Posted by Adqam on 27/01/2011 - 10:17
Pentax D FA 645 25mm f/4
Going back to the 645 design, I have used these in the past and they are not that heavy or bulky compared to even a FF nikon or Canon DSLR. The design is by its nature more "boxy" but it works very well and it is definitely suitable for use "in the field" as well as the studio. I would love to "p...
Posted by wadna on 01/02/2011 - 10:09
Pentax D FA 645 25mm f/4
"Of course it's of interest. This looks like the first improved wide angle for the 645D that was promised from the start." The lack of activity on this thread proves my point I think. Members of this forum are not interested in a FF Pentax or the 645D as they have made abundantly clear in previou...
Posted by wadna on 03/02/2011 - 21:59
Pentax D FA 645 25mm f/4
"Of course it's of interest. This looks like the first improved wide angle for the 645D that was promised from the start." The lack of activity on this thread proves my point I think. Members of this forum are not interested in a FF Pentax or the 645D as they have made abundantly clear in previou...
Posted by K10D on 04/02/2011 - 03:02
Difference between Pentax f/1.4 and f/1.7
It's been documented on this board previously that digital sensors can't see f/1.4 they can only see it as f/1.7 anyway I can't speak for anyone else's experience but my K20D sensor can certainly see the difference between 1.2 and 1.4 and 1.7 - I haven't tested my 1.2 on my K-5 yet. but I'll add th...
Posted by Smeggypants on 31/01/2011 - 15:59
Difference between Pentax f/1.4 and f/1.7
I think that's all highly dubious, but unfortunately the internet being what it is it gets repeated until it becomes a fact... The manufacturers will set their sensor sensitivity so that it closely approximates the ISO value, but we should remember it isn't film. It's a sensor and behaves in a di...
Posted by johnriley on 31/01/2011 - 19:09
Difference between Pentax f/1.4 and f/1.7
From Mr Luminous Landscape .... "In other words, the "marginal" light rays coming in at a large angle from near the edges of the large aperture are completely lost." This is clearly nonsense from my experience with the K20D and my f/1.2 v. 1.4 ( both apartures outside Mr Luminous Landscape's w...
Posted by Smeggypants on 31/01/2011 - 20:07
Difference between Pentax f/1.4 and f/1.7
I thought it might be something to do with the smaller area of a cropped sensor compared to a frame of film? All I know is that with my Samyang 85mm f1.4 I get a very bright viewfinder and it's dead easy to focus manually! :D
Posted by Dangermouse on 31/01/2011 - 20:42
Difference between Pentax f/1.4 and f/1.7
It's been documented on this board previously that digital sensors can't see f/1.4 they can only see it as f/1.7 anyway and the focusing screens see both as about f/2.5. The only slight advantage with an f/1.4 and it may not apply across the board is that a 50mm A f/1.4 lets through slightly more li...
Posted by Smeggypants on 31/01/2011 - 21:23
Difference between Pentax f/1.4 and f/1.7
The Nokton 58mm on K-7, you set the aperture to f1.4 you expect the image to be softer than 1.8. The accuracy of the lens decreasing as you reach the less well defined parts of the lens. Fair enough. Nice for a portrait. In Av as you decrease the aperture the exposure time changes. f1.4&1/60s,...
Posted by dougf8 on 31/01/2011 - 21:41
Difference between Pentax f/1.4 and f/1.7
It's been documented on this board previously that digital sensors can't see f/1.4 they can only see it as f/1.7 anyway Well here's proof that a sensor CAN see the differences between wide apertures. My Canon shooting buddy took some pics of his zither at 1.2, 1.4, 1.7 an 2.0 - Canon 5D MK1 and ...
Posted by Smeggypants on 03/02/2011 - 22:02
Difference between Pentax f/1.4 and f/1.7
That's very interesting :wink: You can actually see the curvature of field of the lens :shock: From the Exif Data The first three have exposures of 1/13th sec i.e. all the same so the lens is being seen as an f/1.7 :?: The fast lens is of absolutely no advantage. Canon must have adjusted the ISO?...
Posted by Algernon on 04/02/2011 - 10:21
Difference between Pentax f/1.4 and f/1.7
It's been documented on this board previously that digital sensors can't see f/1.4 they can only see it as f/1.7 anyway Well here's proof that a sensor CAN see the differences between wide apertures. My Canon shooting buddy took some pics of his zither at 1.2, 1.4, 1.7 an 2.0 - Canon 5D MK1 and ...
Posted by Tyr on 04/02/2011 - 10:25
