All Forum Comments
Is that a Robot ...... It looks like the new K-02
Comment by Algernon posted on Some old Toy's from the 1970's at 26/01/2014 - 14:24
Comment by Algernon posted on Users map? at 25/01/2014 - 21:37
Just upload geotagged photos of.....
A): A twig in my garden or Flower if your a professional.
B): My Cat (or Dog)
C): My Rice Pudding
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A): A twig in my garden or Flower if your a professional.
B): My Cat (or Dog)
C): My Rice Pudding
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Comment by Algernon posted on Users map? at 25/01/2014 - 20:52
Can't see any point in moving it. I've been doing a lot of work with panoramas the last week and a lot of folklore stuff just doesn't make sense, so little point in hanging onto old stuff.
Just make the Photozone page a sticky It explains amongst other things why a cricket pitch looks small on TV
There is another thread about WA lenses in which Steve has posted full sized shots at 8,10,12,14 and 16mm (not sure if 20mm was included). Would have been better with some footballs in the corners to show the perspective a bit better. It is different.
This is a can from a corner at 10mm. It's not really distorted that's what you get when most of the IP's are within the frame. Still shows at 20mm.
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Just make the Photozone page a sticky It explains amongst other things why a cricket pitch looks small on TV
There is another thread about WA lenses in which Steve has posted full sized shots at 8,10,12,14 and 16mm (not sure if 20mm was included). Would have been better with some footballs in the corners to show the perspective a bit better. It is different.
This is a can from a corner at 10mm. It's not really distorted that's what you get when most of the IP's are within the frame. Still shows at 20mm.
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Comment by Algernon posted on Pentax 50mm 1:2 SMC Pentax-M. Any good for portraits? at 25/01/2014 - 16:02
Perspective is controlled by the distance between the vanishing points.
As you move them further apart the picture becomes flatter.
In any case it's like saying a 2:1 macro is the same as a 1:1 macro if you enlarge it
Just suppose you moved close enough to the bay window at the top of your picture so that you could get upstairs and downstairs in the shot without having to tilt the camera (take shot 1) and then tilted and zoomed just to get a shot of the upstairs windows without the ground floor (take shot 2).
The windows (upper and lower) in shot 1 would be vertical and in shot 2 they would be converging. Now enlarge the upstairs window in shot 1 to a similar size to shot 2.
The two shots will show the windows differently..... so perspective isn't set by distance it's set by the camera/lens and how it's tilted plus distance.
To be on the safe side, it's better to just put whatever lens you want to use on the camera..... walk about/zoom /tilt until it looks right in the viewfinder and then take the shot.
You can of course get software or tilt lenses to correct the verticals.
As you move them further apart the picture becomes flatter.
In any case it's like saying a 2:1 macro is the same as a 1:1 macro if you enlarge it
Just suppose you moved close enough to the bay window at the top of your picture so that you could get upstairs and downstairs in the shot without having to tilt the camera (take shot 1) and then tilted and zoomed just to get a shot of the upstairs windows without the ground floor (take shot 2).
The windows (upper and lower) in shot 1 would be vertical and in shot 2 they would be converging. Now enlarge the upstairs window in shot 1 to a similar size to shot 2.
The two shots will show the windows differently..... so perspective isn't set by distance it's set by the camera/lens and how it's tilted plus distance.
To be on the safe side, it's better to just put whatever lens you want to use on the camera..... walk about/zoom /tilt until it looks right in the viewfinder and then take the shot.
You can of course get software or tilt lenses to correct the verticals.
Comment by Algernon posted on Pentax 50mm 1:2 SMC Pentax-M. Any good for portraits? at 25/01/2014 - 13:24
That's all marketing, snake oil stuff. Bit like selling a watch that
doesn't work and saying it's spot on twice a day. It's very confusing
and because of your original post about the Photozone article i.e.....
"Whoever wrote that PhotoZone article needs a good slapping,
and his computer confiscating." It seems to have confused you.
http://www.photozone.de/focal-length-and-perspective
Of course you can crop a 20mm view out of a 10mm shot. By enlarging it you have moved the vanishing points further apart and changed the perspective. You can also only do it from the centre. You can't create a 10mm shot out of a 20mm shot..... it has a unique perspective. Footballs etc in the corners become ovals.
Apart from marketing I can't see any practical use for what you have done. You could have walked up the road easy enough.
Photographers don't think like that anyway and it's very rare that they can't move. For most people a wide angle shot will begin with some pebbles in the foreground or something in the corner. The next decision will be as shown on the Photozone page..... Do I want the subject in the background large or small..... the wider the lens the smaller the background will be.
Photographers sometimes decide to use a 10mm lens and crop off the bottom/top of the shot to avoid tilting the camera and causing excessive converging verticals.
The Photozone page is actually the answer to the problem I was having explaining the Nythavn buildings shot a 22mm lens will make the far end of the buildings bigger compared to a 14mm lens. Moving in closer would also be better....... So if you want to take an isometric type shot of a building, similar to the typical pub painting a 20mm lens will make the front/back ratio closer..... a 10mm will make the back smaller and look long away. This is the same as estate agents do with rooms. They could of course crop their wide angle shots to make the rooms look smaller but why?
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doesn't work and saying it's spot on twice a day. It's very confusing
and because of your original post about the Photozone article i.e.....
"Whoever wrote that PhotoZone article needs a good slapping,
and his computer confiscating." It seems to have confused you.
http://www.photozone.de/focal-length-and-perspective
Of course you can crop a 20mm view out of a 10mm shot. By enlarging it you have moved the vanishing points further apart and changed the perspective. You can also only do it from the centre. You can't create a 10mm shot out of a 20mm shot..... it has a unique perspective. Footballs etc in the corners become ovals.
Apart from marketing I can't see any practical use for what you have done. You could have walked up the road easy enough.
Photographers don't think like that anyway and it's very rare that they can't move. For most people a wide angle shot will begin with some pebbles in the foreground or something in the corner. The next decision will be as shown on the Photozone page..... Do I want the subject in the background large or small..... the wider the lens the smaller the background will be.
Photographers sometimes decide to use a 10mm lens and crop off the bottom/top of the shot to avoid tilting the camera and causing excessive converging verticals.
The Photozone page is actually the answer to the problem I was having explaining the Nythavn buildings shot a 22mm lens will make the far end of the buildings bigger compared to a 14mm lens. Moving in closer would also be better....... So if you want to take an isometric type shot of a building, similar to the typical pub painting a 20mm lens will make the front/back ratio closer..... a 10mm will make the back smaller and look long away. This is the same as estate agents do with rooms. They could of course crop their wide angle shots to make the rooms look smaller but why?
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Comment by Algernon posted on Pentax 50mm 1:2 SMC Pentax-M. Any good for portraits? at 25/01/2014 - 12:23
Does it weigh more than a Tonne?
(Well every other daft question has been asked )
I was hoping that they'd bring out a 1.5x Back to Front Converter
that left the lens as it was, but magnified the sensor so that it
was FF
(Well every other daft question has been asked )
I was hoping that they'd bring out a 1.5x Back to Front Converter
that left the lens as it was, but magnified the sensor so that it
was FF
Comment by Algernon posted on the holy grail.. at 25/01/2014 - 11:13
I've posted this many times before on here, but people just
don't seem to read Goes back to the K10D days at least.
If you know YOUR camera you shouldn't need to be told
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don't seem to read Goes back to the K10D days at least.
If you know YOUR camera you shouldn't need to be told
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Comment by Algernon posted on Noise and intermediate ISO settings at 25/01/2014 - 10:53
I couldn't afford the Gold Plated Leica I really wanted
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Comment by Algernon posted on What Reason Makes U insist on Pentax's Camera at 24/01/2014 - 16:45
Would certainly help Billy the Burglar!
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Comment by Algernon posted on Users map? at 24/01/2014 - 11:22
