how can zoom camcorder often far, although the objective is relatively small
Frage von Multivideocutterman: Oktober 2010
Hi!
I've got a question and namely: how can zoom camcorder often extremely common, although the objective is relatively small? With expensive cameras, or (D) SLRs Lenses which are much larger / wider, and may be less able to zoom in (and it cost more)
how can that be?
Best regards, Multivideocutterman
Antwort von rush:
This is basically comparable with compact taking pictures ...
The sensors are much smaller than a DSLR and therefore make the calculation of Lenses simpler, smaller and cheaper just synonymous.
Furthermore, the light intensity from the zoom in camcorders in general ...
If you have better lenses, but many of continuous Lichstärke.
Antwort von nico:
There are 2 types of zoom: optical and digital.
The optical zoom (up to normal, about 20 times) is a pretty good lens and needs to get consistently good picture.
In digital zoom, this is "calculated" and this can be achieved significantly higher zoom factors. Sometimes even up to 200 times. The picture is all the more pixelated and worse the higher you choose the factor. Often begins at the even at 8 to 10 times.
Conclusion: Optical zoom is better, digital is pure hogwash and is only used for customer contracts slaps.
Antwort von tommyb:
@ Multivideocutterman When it comes to you only by the factor (20x) or the Focal length max (300mm)?
Antwort von Multivideocutterman:
I was about that I wondered why I have to spend too much money for mega 300mm, if I buy ne DSLR, but relatively little on NP camcorder. For this, the 300mm lens in the DSLR is synonymous much larger than the built-in camcorder.
The rush of raised small image sensor and the light intensity DECLARE the course.
Antwort von Replay:
The lens in the camcorder has to do less than a lens in a DSLR. Therefore, the disadvantages are always present in such huge zoom for video not so much visible. But still has such a zoom trunk detrimental onto the video image.
Suppose there are visual (natural laws) that describe the refraction of light. And each lens is subject to these inherent principles. Therefore, each more or less Lens aberration (color fringing in areas of the picture with a lot of contrast, distortion, edge blur, etc). However, this raises the question of how strong these aberrations are 8and how well the electronics of the camera can be expected out of them).
The higher the quality the lens, the smaller the aberrations. A very good lens, the aberrations can not be identified. Lenses are very good so-called prime lenses, without zoom. This means that the lenses are fixed to each other and it is the steel gear (ie the light) through the lens a fixed, predetermined path. So you can avoid aberrations.
For zoom lenses, the move to each other when pressed the zoom. Accordingly, changes in the steel path and thus moves synonymous times in areas where the aberrations are visible. And the larger the zoom range, the next transition of the steel enters "unfavorable" regions before and according to clearly see this
That does not mean that all zooms are bad. For consumer video, you can certainly without much damage up to a maximum of 10 times or with small compromises (it is really the end) are 15 times zoom in Still Image should be 5-fold to be the end. The Resolutionbei video is less, so the requirements s.das Lens synonymous not as high. There are definitely very good 20x zoom in the broadcast sector, but these are then price areas that can be kicked out any consumer videographers the backup.
Very high quality (and correspondingly expensive) Video Cameras (professional equipment) have a synonymous Exchangeable optics, like a reflex camera in the photo area. If you see a animal documentary of the BBC, the cameraman was usually strapped to his telephoto lens on the camera and not just raised the zoom full.
Lot zoom, bad picture? Yes. Therefore, one should give preference to the camera, the optical zoom is small or do not cover at least the existing zoom full. In the video usually means 10-fold to more than 15-fold. What goes beyond the image quality degrades considerably visible.
Greetings
Replay
Antwort von Multivideocutterman:
wow, thank you replay, for detailed information:)
the clarified quite a few questions.
Antwort von tommyb:
Yay. Exactly.
And what would have mentioned this yet: A camcorder-lens starts at a non-credited Focal of perhaps 35 or even 40mm. Take, for example, a Sony HDR-HC9. This has converted the video read at an initial focal length of 40mm (
