All Forum Comments
Comment by Anvh posted on Best portrait lens at 19/01/2010 - 14:02
If you want some pictures with it.
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Like said just look at the pictures with what you read here in the other comments, if you want to learn more you can read the articles but they go a bit deeper into the matter.
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Like said just look at the pictures with what you read here in the other comments, if you want to learn more you can read the articles but they go a bit deeper into the matter.
Comment by Anvh posted on Help needed at 18/01/2010 - 23:30
K10D wrote:
FOV doesn't change with distance. The angle is constant. Opposite distance "width" increases with distance.
No you got that wrong.Anvh wrote:
If you want you can have the same field of view with a 50mm lens on an APS-C sensor compared to an MF.
FOV increase with distance so that's why you can have the same FOV.
Am I correct or do I mess it up now?
FOV is fixed per lens focal length as per image area coverage of sensor.K10D wrote:
The 50 mm only has the field of view of a lens 1.5 times longer focal length. However, the cropped sensor sees no more magnification with a 50mm lens tahn a FF sensor.
Regards
Sorry to go off topic here but is it not better to use angel of view instead of field of view?The 50 mm only has the field of view of a lens 1.5 times longer focal length. However, the cropped sensor sees no more magnification with a 50mm lens tahn a FF sensor.
Regards
If you want you can have the same field of view with a 50mm lens on an APS-C sensor compared to an MF.
FOV increase with distance so that's why you can have the same FOV.
Am I correct or do I mess it up now?
FOV doesn't change with distance. The angle is constant. Opposite distance "width" increases with distance.
AOV (angle of view) has a fixed angle and is fixed per lens relative to the sensor size, look up a lens specification, it says AOV.
And yes FOV change with distance since it's in the formula:
f is the film distance (focal length can be used most of the times)
d is the object distance
o is the object dimension
i is the image dimension
Comment by Anvh posted on Best portrait lens at 18/01/2010 - 22:58
K10D wrote:
The 50 mm only has the field of view of a lens 1.5 times longer focal length. However, the cropped sensor sees no more magnification with a 50mm lens tahn a FF sensor.
Regards
Sorry to go off topic here but is it not better to use angel of view instead of field of view?The 50 mm only has the field of view of a lens 1.5 times longer focal length. However, the cropped sensor sees no more magnification with a 50mm lens tahn a FF sensor.
Regards
If you want you can have the same field of view with a 50mm lens on an APS-C sensor compared to an MF.
FOV increase with distance so that's why you can have the same FOV.
Am I correct or do I mess it up now?
Comment by Anvh posted on Best portrait lens at 18/01/2010 - 19:59
technoidiot wrote:
if you wish to use a battery that's not yet approved by Pentax , go right ahead .
I'm not
That's a sort answer.if you wish to use a battery that's not yet approved by Pentax , go right ahead .
I'm not
An email has been send to pentax so hopefully we hear more about it.
Comment by Anvh posted on K-x Battery Capacity (Study case: Mahapowerex 2700mAh) at 18/01/2010 - 16:38
thealfath wrote:
3). or K-x only can used of maximum 2000mAH battery? (i've been search for this battery capacity on Manual Book, but i cant find the information about K-x maximum battery capacity)
There is no maximum mAH since it isn't important for the device but it is for the battery.3). or K-x only can used of maximum 2000mAH battery? (i've been search for this battery capacity on Manual Book, but i cant find the information about K-x maximum battery capacity)
To say it simply it's how large the fuel tank is, if you want you can install a 200 litre tank in your car or a 10 litre, for the engine it wouldn't matter but they won't run so far with a 10 litre one.
Comment by Anvh posted on K-x Battery Capacity (Study case: Mahapowerex 2700mAh) at 18/01/2010 - 16:25
It's only been recently when you can buy those, so they haven't been tested yet by pentax.
Voltage seems high of 1.6, freshly charged they are even 1.85 but drop very fast under load to a stable 1.6v.
Lithium also run at 1.6v, even the older ones go up to 1.8v so voltage wise it shouldn't be a problem if you're allowed to use lithium.
Discussing on the pentaxforums.com link
Voltage seems high of 1.6, freshly charged they are even 1.85 but drop very fast under load to a stable 1.6v.
Lithium also run at 1.6v, even the older ones go up to 1.8v so voltage wise it shouldn't be a problem if you're allowed to use lithium.
Discussing on the pentaxforums.com link
Comment by Anvh posted on K-x Battery Capacity (Study case: Mahapowerex 2700mAh) at 18/01/2010 - 16:13
Daniel Bridge wrote:
If you have an image 4000 pixels long, and you set the ppi to 4000ppi without resampling, then, without further intervention, it will print as a 1 inch image. If instead of 4000ppi you chose 400ppi, it would be a 10 inch image.
hmmm yes, I mixed things up a bit If you have an image 4000 pixels long, and you set the ppi to 4000ppi without resampling, then, without further intervention, it will print as a 1 inch image. If instead of 4000ppi you chose 400ppi, it would be a 10 inch image.
Comment by Anvh posted on Pentax users hate photoshop at 18/01/2010 - 15:53
A bit of a different question but has anyone tried NiZn batteries?
Here is a user reviews link link
I wonder if the K-X would like the extra 0.4 volt of standard alkaline batteries
or 1.6 volt over rechargeable.
Also I wonder if a flash gun would charge a bit faster.
hmm just found out they aren't so good for your flash ^^;
Here is a user reviews link link
I wonder if the K-X would like the extra 0.4 volt of standard alkaline batteries
or 1.6 volt over rechargeable.
Also I wonder if a flash gun would charge a bit faster.
hmm just found out they aren't so good for your flash ^^;
Comment by Anvh posted on K-x Battery Capacity (Study case: Mahapowerex 2700mAh) at 18/01/2010 - 15:24
Geoff, I think you give PPI to much credit. It's just a measurement of how many pixels there are in an inch.
It's only interesting to play with that if you want 1:1 print proof.
Also printers don't use PPI that's for monitor and other pixel devices, printers use DPI, and that's something else.
Altering your PPI will not have an effect on your pixel size or print size.
It's only interesting to play with that if you want 1:1 print proof.
Also printers don't use PPI that's for monitor and other pixel devices, printers use DPI, and that's something else.
Altering your PPI will not have an effect on your pixel size or print size.
Comment by Anvh posted on Pentax users hate photoshop at 18/01/2010 - 15:12
The matter about PPI here on the forum had my head spinning last time