Search results for 'back focus' - page 1451
K-7 and Sigma HSM lenses
I played with a production version of the K7 yesterday at LCE in Guildford. I still think it is a lovely camera, but Liveview was disappointing, even with the Pentax lenses as I could not get it to autofocus. In video mode the Live view seemed a little jelly-like even with SR switched off Maybe o...
Posted by Greytop on 19/07/2009 - 19:31
K-7 and Sigma HSM lenses
I am not being deliberately contentious but I do need to understand how and why you might use Live view if you can't actually control whether it is in focus or not. I realise you might use it for composition but then would you flip back to VF to actually focus, whether manually or automatically?...
Posted by BODYHEAT on 19/07/2009 - 19:39
K-7 and Sigma HSM lenses
I realise you might use it for composition but then would you flip back to VF to actually focus, whether manually or automatically? In which case, why not just do everything through the viewfinder? When set to select Phase difference AF all you do is hit the AF button and the mirror flips down and b...
Posted by Greytop on 19/07/2009 - 20:02
K-7 and Sigma HSM lenses
I am not being deliberately contentious but I do need to understand how and why you might use Live view if you can't actually control whether it is in focus or not. I realise you might use it for composition but then would you flip back to VF to actually focus, whether manually or automatically?...
Posted by Unlocker on 19/07/2009 - 23:04
K-7 and Sigma HSM lenses
I am not being deliberately contentious but I do need to understand how and why you might use Live view if you can't actually control whether it is in focus or not. I realise you might use it for composition but then would you flip back to VF to actually focus, whether manually or automatically?...
Posted by BODYHEAT on 19/07/2009 - 23:11
K-7 and Sigma HSM lenses
Aah that makes sense, although there must be a way of working out the exact distance from the sensor for the AF to work, just like they used to have Off The Film metering measuring exactly how much light fell on the film. There are active auto focus systems think of sonar and infrared, the problem i...
Posted by Anvh on 19/07/2009 - 23:28
K-7 and Sigma HSM lenses
Aah that makes sense, although there must be a way of working out the exact distance from the sensor for the AF to work, just like they used to have Off The Film metering measuring exactly how much light fell on the film. There are active auto focus systems think of sonar and infrared, the problem i...
Posted by BODYHEAT on 19/07/2009 - 23:34
K-7 and Sigma HSM lenses
These factors are summed up in the f number of a particluar aperture, which these days is very close to the transmission value. This value is conveyed to the camera, and of course it knows how much light there is anyway. Thank you didn't knew that John since I thought F-number was only a ratio. Y...
Posted by Anvh on 20/07/2009 - 00:17
Air displays
Just got back from the Royal International Air Tattoo. Took loads of pics, but I have to say that there has been a high failure rate, although I like to think that one or two wern't too shoddy. Mainly blurring issues, or possibly focus awry just enough to soften the image. Here's my question. I h...
Posted by Sdeve on 19/07/2009 - 21:02
Air displays
Well, why don't you post some of the less shoddy pictures here.:wink: It's much easier to judge, evaluate and advice on actual pictures. Seeing your hurricane pic. in the gallery, using the K200D and Tamron, I think you did a pretty good job, and probably were pushing against the boundaries of wha...
Posted by Malo1961 on 19/07/2009 - 21:28
Air displays
Focal length x 1.5 and then multiply by 1.5 again. Would that not boil down to "multiply by 2.25"? I am still learning how to take pictures of aircraft in flight. I have been practising on seagulls :roll: I have found I get the best results by using a full press on the shutter release so as soon ...
Posted by Oggy on 19/07/2009 - 22:07
Air displays
I am still learning how to take pictures of aircraft in flight. I have been practising on seagulls :roll: I have found I get the best results by using a full press on the shutter release so as soon as the subject is in focus the picture is taken. Oggy, that's quite interesting what you are just sayi...
Posted by aminstar on 19/07/2009 - 22:35
Air displays
Hi, I used to do a lot of airshow photography back in the 70`s, I used to arrive well before the gates opened to photograph the static stuff, I had a small set of household steps to get shots over the barriers, These days i use a Zigview S2 on a monopod to hold the camera above my head or at ground...
Posted by PeteL on 20/07/2009 - 08:34
Air displays
I am still learning how to take pictures of aircraft in flight. I have been practising on seagulls :roll: I have found I get the best results by using a full press on the shutter release so as soon as the subject is in focus the picture is taken. Oggy, that's quite interesting what you are just sayi...
Posted by Oggy on 20/07/2009 - 12:33
Air displays
[quote:3496ace15f="Pwynnej"][quote:3496ace15f="Cloudhunter"]Hi, Use the following formula to get sharp shots... Focal length x 1.5 and then multiply by 1.5 again. So for instance 300mm would need a shutter speed of 300x1.5=450 450x1.5=675 So make sure the shutter is above 675. I know you...
Posted by Cloudhunter on 20/07/2009 - 22:00
Air displays
Howeever it is achieved a 100mm lens gives the equivalent of a 150mm on a crop camera. If you stood with a nikon d3 and a nikon d300 with identical lenses back to the wall at an air show and zoomed to 100mm on both the d300 would have a larger aircraft in the viewfinder than the d3 would. Matt...
Posted by Pwynnej on 21/07/2009 - 08:53
Air displays
Howeever it is achieved a 100mm lens gives the equivalent of a 150mm on a crop camera. If you stood with a nikon d3 and a nikon d300 with identical lenses back to the wall at an air show and zoomed to 100mm on both the d300 would have a larger aircraft in the viewfinder than the d3 would. Matt...
Posted by Cloudhunter on 21/07/2009 - 09:16
Air displays
Focal length x 1.5 and then multiply by 1.5 again. I have been practising on seagulls :roll: I have found I get the best results by using a full press on the shutter release so as soon as the subject is in focus the picture is taken. Be very careful when your photographing seagulls, make sure there ...
Posted by Rees on 21/07/2009 - 12:04
k-7 price
No sooner will the pound get stronger and Old Gorden will put the VAT back to 17% or higher.
Posted by ttk on 20/07/2009 - 17:53
k-7 price
Hi, To be honest, I'm not convinced by the arguments for the UK price of the K7. It's a lot more than the launch price in a number of other countries, using the current exchange rates. These rates have been similar for a while - eg 155 Yen to the UKP back in early June when I was in Japan, and ...
Posted by jonathand on 20/07/2009 - 21:56
