|
| Author | Thread |
|
|
02/20/2005 02:54:43 AM · #1 |
I was just sitting here wondering what far out ideas that I have for digital cameras and was wondering if others have done the same or what they would like to see. Here is one of mine. Putting 5 of your favorite lenses into one lens instead of your camera bag!
1. The Ultimate lens w/ Camera communication
Lets say a company [canon] could build a lens that would go beyond a zoom lens or fixed lens and become User defined lens. The lens would have the capability of say 24mm â 300mm and f/1.8 â f/32 throughout. They could put 5 lens modes on the camera so the user could set their 5 favorite lens configurations instead of having to carry around 5 different lenses.
Example:
1. Say you want a âCanon - 85mm f/1.8 USM EF Lensâ: Preset one mode to be 85mm @ f/1.8 lens.
2. Say you want a âCanon - 24mm f/2.8 USM EF Lensâ: Preset another mode to be 24mm @ f/2.8 lens.
And so on. But at the same time the lens will work as a zoom lens also.
So instead of having 5 different lenses to carry around with you, your camera and lens would work together giving you your favorite 5 lenses while carrying only one lens.
I don't even know if it is possible but it's ok to dream. :)
Message edited by author 2005-02-20 11:21:09.
|
|
|
|
02/20/2005 03:00:16 AM · #2 |
Whatever you're smokin, i'll have some too please.
This exists in one format - a 28-300 zoom. you want an 85 lens, set it at 85 and leave it. no it isn;t 2.8, but that could be done now.
the reason you have a 'favorite' lens is the type of pic it takes (color, contract, sharpness, etc).
If a 10-500mm 1.4-2.8 could be built, that would be getting somehere!
And yes, under $400 please.
ooh that's some good (cough, cough) sh**
|
|
|
|
02/20/2005 03:21:08 AM · #3 |
Prof_Fate,
Your post had me laughing out loud... it was great... am sitting here... by myself, in my office... and am laughing out loud!
Thanks for the laugh.
Originally posted by Prof_Fate:
Whatever you're smokin, i'll have some too please.
This exists in one format - a 28-300 zoom. you want an 85 lens, set it at 85 and leave it. no it isn;t 2.8, but that could be done now.
the reason you have a 'favorite' lens is the type of pic it takes (color, contract, sharpness, etc).
If a 10-500mm 1.4-2.8 could be built, that would be getting somehere!
And yes, under $400 please.
ooh that's some good (cough, cough) sh** |
|
|
|
|
02/20/2005 03:30:30 AM · #4 |
second hand smoke will do that to ya.
here, have another hit, put on some Pink Floyd,and go vote on them purty pictures some more.
|
|
|
|
02/20/2005 03:39:10 AM · #5 |
Originally posted by Prof_Fate:
Whatever you're smokin, i'll have some too please.
This exists in one format - a 28-300 zoom. you want an 85 lens, set it at 85 and leave it. no it isn;t 2.8, but that could be done now.
the reason you have a 'favorite' lens is the type of pic it takes (color, contract, sharpness, etc).
If a 10-500mm 1.4-2.8 could be built, that would be getting somehere!
And yes, under $400 please.
ooh that's some good (cough, cough) sh** |
A lot of pain medication.......since I have an excuse I will ask another dumb question since I don't know a lot [judging from this post, nothing] about lens.
I know that there are lens out there like 28mm-300 and easily set to what mm you wish. But do any of those lens give you the ability to choose f/1.8 - f/32 and anything in between at any given mm. If not could this be made? And if it could be made could a camera incorporate say five user defined settings so the user could enter there 5 favorite lens settings. And of course the use of the best glass would be a must for color, contrast, and sharpness. If all this could be done it would keep a user from having to exchange lenses, they could just set it to the lens mode they want and within a second it would be there. Limiting the times you have to change lens therefor limiting the possibility of dust getting in the camera while keeping the user from caring around so much equipment and having to purchase more lens.
OK medication starting to talk..... :} |
|
|
|
02/20/2005 04:00:20 AM · #6 |
Originally posted by SDW65:
Originally posted by Prof_Fate:
Whatever you're smokin, i'll have some too please.
This exists in one format - a 28-300 zoom. you want an 85 lens, set it at 85 and leave it. no it isn;t 2.8, but that could be done now.
the reason you have a 'favorite' lens is the type of pic it takes (color, contract, sharpness, etc).
If a 10-500mm 1.4-2.8 could be built, that would be getting somehere!
And yes, under $400 please.
ooh that's some good (cough, cough) sh** |
A lot of pain medication.......since I have an excuse I will ask another dumb question since I don't know a lot [judging from this post, nothing] about lens.
I know that there are lens out there like 28mm-300 and easily set to what mm you wish. But do any of those lens give you the ability to choose f/1.8 - f/32 and anything in between at any given mm. If not could this be made? And if it could be made could a camera incorporate say five user defined settings so the user could enter there 5 favorite lens settings. And of course the use of the best glass would be a must for color, contrast, and sharpness. If all this could be done it would keep a user from having to exchange lenses, they could just set it to the lens mode they want and within a second it would be there. Limiting the times you have to change lens therefor limiting the possibility of dust getting in the camera while keeping the user from caring around so much equipment and having to purchase more lens.
OK medication starting to talk..... :} |
If it could be made it would wiegh at least 55lbs and be as big as a dump truck. F/1.8 on a 300mm lens, zoom not withstanding!
Pass da ganja man!
.
Message edited by author 2005-02-20 04:05:47.
|
|
|
|
02/20/2005 04:14:45 AM · #7 |
The problem is... It's very expensive and difficult to make a lens with all the nicest qualities of a prime lens, integrated into a zoom. Good primes tend to have unmatched sharpness because all of the elements in the lens are pretty much static - as such, their positioning and physical attributes can be maximized for highest image quality.
Fixed-aperture zoom lenses are also very expensive... which leads into the discussion of the SIZE of low f-stop lenses... Since aperture is a calculated measurement...
Originally posted by //www.riversidecardiology.com/fstop/f-stop.htm:
An f-stop is the ratio between the focal length of the lens and the *apparent* size of the lens opening as viewed through the front. It must take into account the magnification factor of all lens elements in front of the diaphragm, because it is the size of the opening that the light "sees" as it passes through the lens, not the actual physical diameter of the diaphragm opening.
It is this fact that allows companies to make constant aperture zoom lenses which maintain a constant f-stop when the focal length changes, because such lenses are designed so that the magnification factor (diopter value) of all elements in front of the diaphragm changes as focal length is changed to hold the aperture value constant. |
Two things to note: lens size and the considerations of the fixed f-stop lenses.
The size and weight of a 300/2.8 lens is already huge - without the aperture - I can't imagine 1.4:
//www.photorepetto.com/pag.G.Repetto/GR-f/peppe2.jpg
(consider the price tag of the 300/2.8 - around $4100)
The size and weight of a 200/1.8 lens is also already huge - without the zoom or aperture:
//www.noestudios.com/photo/fm/chimpin.jpg
(consider the price tag - if you can find one used - probably around $2000)
So, in other words... Smoke up. Or keep poppin' those pills. :) |
|
|
|
02/20/2005 04:27:25 AM · #8 |
Such a lens could be made, but it would be huge. To understand why, you need to understand how apertules are defined, and that f/1.8 does not mean quite that same thing at one focal length as it does at another.
First, note that the aperture is not 1.8, but f/1.8. This is a ratio (or fraction), with f referring to focal length. The fraction represents the ratio of the lenses focal length to its diameter. In other words, f/1.8 does not refer to an opening of a fixed size, but rather an opening of a fixed proportion to the length of the lens.
At 50mm, An f/1.8 lens needs to have a maximum aperture opening of 50/1.8, or about 28mm (about 1.1"). If you take that up to 300mm, that same f/1.8 setting now requires an opening of 167 mm, or 6.6" Add to that the space for the lens to operate (the aperture blades have to go somewhere when they open, and suddenly you're carrying around a bug hunk of glass and metal that gets very heavy, and very expensive to produce, very quickly.
-Terry
Message edited by author 2005-02-20 04:29:53.
|
|
|
|
02/20/2005 11:24:04 AM · #9 |
How about this idea - since an APS size sensor is small, much of the light the lens passes through to the sensor area falls outside the sensor surface, right?
So why not add another lens that bends ALL that light to fit onto the sensor - more light on the sensor, same size lens = faster lens (intead of more zoom multiplication!)
My theory is comes from a magnifying glass and the sun - as you move the mag-glass the light is contentrated ever moreso into a smaller space, and gets brighter! all we need to do is focus the image!
So, without knowing the exact math, instead of a 70-200 F4.5-5.6 acting as a 105-300 F4.5-5.6 you'd have a 70-200 F2.8-3.5 or maybe an F1.8-3.0 or there abouts.
Just need a teleconverter type add on lens, right?
|
|
|
|
Current Server Time: 09/14/2025 11:20:09 AM  |
Home -
Challenges -
Community -
League -
Photos -
Cameras -
Lenses -
Learn -
Help -
Terms of Use -
Privacy -
Top ^
DPChallenge, and website content and design, Copyright © 2001-2025 Challenging Technologies, LLC.
All digital photo copyrights belong to the photographers and may not be used without permission.
Current Server Time: 09/14/2025 11:20:09 AM EDT.
|
