All Forum Comments
Comment by Anvh posted on I need a course in Digital Photography at 22/04/2009 - 08:43
Do a forum search you will find a lot.
The camera tends to underexpose with a flash and the battery door isn't the strongest one so handel it with a bit of care and it would be okay.
Just try the flashes in the shop I would say, i find the lack of a swivel head a miss though but maybe not so important for you (Thats why I went for the AF540).
The camera tends to underexpose with a flash and the battery door isn't the strongest one so handel it with a bit of care and it would be okay.
Just try the flashes in the shop I would say, i find the lack of a swivel head a miss though but maybe not so important for you (Thats why I went for the AF540).
Comment by Anvh posted on Samsung DSLR FLASH SEF-36PZF at 21/04/2009 - 23:29
Foxy field of view (FOV) you don't write in MM als for field of view you need to know the distance of that field from the lens so I'm curious about your calculations.
Angle of view (AOV) doesn't need an distance from the field to the lens since it doesn't have a field and to calcualte FOV you need AOV.
here is the formula for angle of view.
(α ) angle of view
(d) (sensor) dimension
(f) focal length
do you also wanna have the formula for focal length?
R1 and R2 radii of curvature
(n) refractive index
(d) Thickness of the lens
(f) focal length
As you can see no image size to be found in that formula
Angle of view (AOV) doesn't need an distance from the field to the lens since it doesn't have a field and to calcualte FOV you need AOV.
here is the formula for angle of view.
(α ) angle of view
(d) (sensor) dimension
(f) focal length
do you also wanna have the formula for focal length?
R1 and R2 radii of curvature
(n) refractive index
(d) Thickness of the lens
(f) focal length
As you can see no image size to be found in that formula
Comment by Anvh posted on Wide angle question/favour at 21/04/2009 - 11:46
I'm very curious where always comes the confusion from, is it our fault maybe?
We had focal lengths in elementry school so you know it's lens specific. A magnify glass for example also has a focal length, does it change depending the size of paper you're using on?
We had focal lengths in elementry school so you know it's lens specific. A magnify glass for example also has a focal length, does it change depending the size of paper you're using on?
Comment by Anvh posted on Wide angle question/favour at 21/04/2009 - 11:37
Nice photos, the lens does seem to preform
Comment by Anvh posted on Powerboat Racing - Carr Mill - St Helens at 21/04/2009 - 11:00
Judith, I what mode are you shooting, AV, M, Etc.?
The Newer digital kameras tend to underexpose with old lenses so you might need to set the exposure setting to over expose your image, it's quite frustrating.
A new member started an topic about it with the K200D just hike along with that please to not go to much off topic here. https://www.pentaxuser.com/forum/topic/k200-under-exposure-11543
The Newer digital kameras tend to underexpose with old lenses so you might need to set the exposure setting to over expose your image, it's quite frustrating.
A new member started an topic about it with the K200D just hike along with that please to not go to much off topic here. https://www.pentaxuser.com/forum/topic/k200-under-exposure-11543
Comment by Anvh posted on New to DSLR at 21/04/2009 - 10:52
You can use programs though to correct the distortion and I've seen photos that are very pleasant even with the distortions, it's hard lens to master though.
Comment by Anvh posted on Rectilinear v Fisheye at 20/04/2009 - 23:18
jackitec wrote:
Not got the time Stefan to busy spraying them to get rid
Please try it, it isn't that bad, you may even get arouse by it Not got the time Stefan to busy spraying them to get rid
Quote:
Cantharidin was first isolated by Pierre Robiquet in 1810. It is an odorless and colorless solid at room temperature. It is secreted by the male blister beetle and given to the female during the mating. Afterwards the female beetle will cover its eggs with it as a defense against predators. The complete mechanism of the biosynthesis is currently unknown. If cantharidin is ingested, it severely irritates the urinary tract as it is excreted, causing swelling of the genitalia. This can cause a harmful condition known as priapism in men, where an erection lasts more than about four hours.
Just joking John Cantharidin was first isolated by Pierre Robiquet in 1810. It is an odorless and colorless solid at room temperature. It is secreted by the male blister beetle and given to the female during the mating. Afterwards the female beetle will cover its eggs with it as a defense against predators. The complete mechanism of the biosynthesis is currently unknown. If cantharidin is ingested, it severely irritates the urinary tract as it is excreted, causing swelling of the genitalia. This can cause a harmful condition known as priapism in men, where an erection lasts more than about four hours.
Comment by Anvh posted on Budding entomologists - comment please!! at 20/04/2009 - 23:07
John you could do a test for me, they arent called blister beetle for nothing. could you thouch them and poke them so that the get mad and please keep doing that for some time if you got blisters it's a blister beetle
Comment by Anvh posted on Budding entomologists - comment please!! at 20/04/2009 - 22:04
You might want to look in your neighborhood for a course, much better I believe or else there are enough here which like to help you to get on the right track. There are a lot of books to read as well, there was a list some time ago but can't find it. Just tell us what you want to know and you get enough tips and information, believe me.
Of course the best way to learn is to try for yourself.