All Forum Comments
Comment by Anvh posted on Pentax marketing of the K-7 at 02/08/2009 - 02:00
EVIL (Electronic Viewfinder Interchangeable Lens) such cameras are called and not SLR (Single Lens reflex).
I'm with all that went before me and say that they aren't there yet.
The refresh rate is one of them it isn't fast enough and also dark light performance isn't that great, haven't tried the last one myself though.
With dropping the mirror you will not gain a size reduction of the camera since the lens still needs to have the right distance from the sensor. Therefor I don't see Pentax taking the step making an EVIL in the near future, it would mean they need a new lens series to make the most out of it.
There are also some other objection against such camera like that the sensor is on all the time so wearing out and heating up creating more image noise. Also it drains batteries the whole time while using.
I'm with all that went before me and say that they aren't there yet.
The refresh rate is one of them it isn't fast enough and also dark light performance isn't that great, haven't tried the last one myself though.
With dropping the mirror you will not gain a size reduction of the camera since the lens still needs to have the right distance from the sensor. Therefor I don't see Pentax taking the step making an EVIL in the near future, it would mean they need a new lens series to make the most out of it.
There are also some other objection against such camera like that the sensor is on all the time so wearing out and heating up creating more image noise. Also it drains batteries the whole time while using.
Comment by Anvh posted on Der Spiegel at 02/08/2009 - 01:45
Here is your answer Amin about the f/# and N
Quote:
The literal interpretation of the f/N notation for f-number N is as an arithmetic expression for the effective aperture diameter (entrance pupil diameter), which is equal to the focal length divided by the f-number: D = f / N. The notation is commonly read aloud as /ɛf/ followed by the number: f/8, for example, is usually pronounced "/ɛf/ eight".
The literal interpretation of the f/N notation for f-number N is as an arithmetic expression for the effective aperture diameter (entrance pupil diameter), which is equal to the focal length divided by the f-number: D = f / N. The notation is commonly read aloud as /ɛf/ followed by the number: f/8, for example, is usually pronounced "/ɛf/ eight".
Comment by Anvh posted on Help understanding technicalities of Macro lenses at 01/08/2009 - 14:51
No George I want my data writing away differently then magnetic and in such spreading the risk and I wont keep it off-site. I never said such things so don't mix thing up now
Burned data is fixed data so in such no alternation can be done to it and burnable mediums are quite resilient against what you can throw to them, except warmth, UV and other radiation. Placed in a jewel-case in a closet would keep it in perfect working order for certainly 30 to over a 100 years, i'm not so sure HDD can keep their magnetic based information intact for so long.
Burned data is fixed data so in such no alternation can be done to it and burnable mediums are quite resilient against what you can throw to them, except warmth, UV and other radiation. Placed in a jewel-case in a closet would keep it in perfect working order for certainly 30 to over a 100 years, i'm not so sure HDD can keep their magnetic based information intact for so long.
Amin the f-number can also be called focal ratio, that's a better word for it to make you understand it.
Focal ratio is like the word suggest a ratio, it's a ratio between the aperture and the focal length.
When using a TC you lengthening the focal length but the aperture stays the same that's why the focal ratio change.
This the formula
f/# = f/number
N = f/number
f = focal length
D = the diameter of the entrance pupil
so a 200mm at f/11 will give the same result as a 100mm + 2x tc at f/5.6.
Since the focal length is doubled it will effectively double the focal ratio as well.
Keep in mind that the TC adds glass to the lens so that means that because of that it might be just a tiny bit darker.
Focal ratio is like the word suggest a ratio, it's a ratio between the aperture and the focal length.
When using a TC you lengthening the focal length but the aperture stays the same that's why the focal ratio change.
This the formula
f/# = f/number
N = f/number
f = focal length
D = the diameter of the entrance pupil
so a 200mm at f/11 will give the same result as a 100mm + 2x tc at f/5.6.
Since the focal length is doubled it will effectively double the focal ratio as well.
Keep in mind that the TC adds glass to the lens so that means that because of that it might be just a tiny bit darker.
Comment by Anvh posted on Help understanding technicalities of Macro lenses at 01/08/2009 - 11:42
Oh yeah tapes we forgot that one
Like I said I already use HDD for backup but for some I simply want a third backup on another medium simply to spread risk.
Internet simply isn't an option since I regard everything that I put on the web something that can be stolen from me, there are hackers everywhere now a days so even a secured site I will apply that rule to.
For internet storage, Martin already gave me this link in another topic about storage www.zenfolio.com it supports tiff and that for $40, that's a better price the $5 a month. Also a blu-ray is $8 a disk and if I back up 25gb once every 6 month blu-ray is a cheaper option and everything is in my own hands.
We aren't talking about a full backup here simply of your most precious and/or best shots.
Like I said I already use HDD for backup but for some I simply want a third backup on another medium simply to spread risk.
Internet simply isn't an option since I regard everything that I put on the web something that can be stolen from me, there are hackers everywhere now a days so even a secured site I will apply that rule to.
For internet storage, Martin already gave me this link in another topic about storage www.zenfolio.com it supports tiff and that for $40, that's a better price the $5 a month. Also a blu-ray is $8 a disk and if I back up 25gb once every 6 month blu-ray is a cheaper option and everything is in my own hands.
We aren't talking about a full backup here simply of your most precious and/or best shots.
womble wrote:
Pentax service?
Can you still call it "pentax service" while somebody else do the servicing? Pentax service?
Comment by Anvh posted on 1 month old DA* 50-135 no longer communicating to camera body at 31/07/2009 - 22:01
Are you sure it's TTL and not P-TTL?
I believe that the Jessops flash doesn't support P-TTL and I know for sure that the K10D doesn't support TTL only P-TTL.
About the P-TTL and Pentax it seems that the only camera that expose correctly is the K-7 all others have around 1 stop underexposure with P-TTL. The solution around this is to set the flash output in the camera +1 EV.
I believe that the Jessops flash doesn't support P-TTL and I know for sure that the K10D doesn't support TTL only P-TTL.
About the P-TTL and Pentax it seems that the only camera that expose correctly is the K-7 all others have around 1 stop underexposure with P-TTL. The solution around this is to set the flash output in the camera +1 EV.
Comment by Anvh posted on K10 -underexposes with TTL at 31/07/2009 - 21:48
These a comparison of all the newer models of flashes that work on the your camera. link
Comment by Anvh posted on which flash at 31/07/2009 - 20:42
You can find some proper K7clips on youtube now so hopefully that would bring some over instead of an "expert" making a movie.