hanqiang1011
Senior Member
With all 3 tubes mounted together with the lens; eg: Tamron 17-35mm plus the 3 tubes, can my Tamron 17-35 still function as a normal lens as per without tubes. :dunno:
Extension Tube Test shots
- Thread starter yehosaphat
- Start date
- Status
With all 3 tubes mounted together with the lens; eg: Tamron 17-35mm plus the 3 tubes, can my Tamron 17-35 still function as a normal lens as per without tubes. :dunno:
Leong23
Senior Member
With extension tube, your lens will unable unable to focus infinity.
yehosaphat
Senior Member
Nope.
giantcanopy
Senior Member
Actually at that level of stacking i would not be too worried about diffraction. I have stacked several extension tubes with sharp images as long as one can find the focus. manually.
With only 136mm of extension
#1
This was less than the first ( i cannot remember how many tubes i added for this )
#2
This is a shot with 446mm worth of extension with a 55mm micro of the greenback
No sharpening, slightly soft but I do not think i have achieved the critical focus yet.
#3
Ryan
Leong23
Senior Member
may i ask
wad else can we shoot wif extension tube ? other then macro?
anything. Extension tube just able you to reduce the minimum focusing distance.
Leong23
Senior Member
For sharpness, i don't just referring to photo purely for web posting.
Sharpness also must include preserving detail
some example
#1 Photo (no cropping, no sharpening)
#2 Same photo as above (heavy cropped, no sharpening)
Leong23
Senior Member
Some layman term on diffraction.
Diffraction is happening when light is travelling through the lens.
The glass elements inside the lens help to control diffraction
(that way pro lense is sharper - more lens elements)
When stack with too much extension tube hence creating a big void with no glass elements, the light will run wild and some never make it to the sensor (loss of detail in photo)
Diffraction is happening when light is travelling through the lens.
The glass elements inside the lens help to control diffraction
(that way pro lense is sharper - more lens elements)
When stack with too much extension tube hence creating a big void with no glass elements, the light will run wild and some never make it to the sensor (loss of detail in photo)
hanqiang1011
Senior Member
But can function normally shooting group photos?
Del_CtrlnoAlt
Senior Member
you don't look like a newbie, but your question is very funny.
extension tube as we all know, makes a lens possible for closer focusing aka reducing the minimum focusing distance, in such, create magnification.
as compared to macro lenses, macro lenses have full range of focusing distance from 1:1 to infinity, but normal lenses have a much further minimum focusing distance then to infinity.
So if add extension tube to normal lenses, makes it function like a macro lens but minus the infinity.
your 1st question, i wonder why would anyone wanna put extension tube on a wide angle lens. Wide angle lens already have the ability to focus a shorter distance in MFD as compared to normal lenses. normally an extension tube is attached to lenses more than 50mm. thats the norm.
And i wonder how would you be able to take group shots with an extension tube, you get close, and you want wide angle?
I know somebody like to use wideangle for macro shoot due to the perspective. However, it is apparently not what he mean to ;p
Leong23
Senior Member
Maybe you should explain more, don't really understand your question...... :sweat:
A good quality closeup filter such as the Canon 500D will cost almost the same as a set of third party tubes. Closeup filters do not cause any light loss and are best used with longer focal length lenses. Its a filter so it only screws onto similar diameter lenses.
Extension tubes can be used with any lens and the major disadvantage is light loss and if stacked, diffraction can be a big issue.
IMHO, a dedicated macro lens is still the way to go. A secondhand Tamron 90 or Sigma 105 costs not much more than a Canon 500D but offers a way higher mag rate and top image quality.
Extension tubes can be used with any lens and the major disadvantage is light loss and if stacked, diffraction can be a big issue.
IMHO, a dedicated macro lens is still the way to go. A secondhand Tamron 90 or Sigma 105 costs not much more than a Canon 500D but offers a way higher mag rate and top image quality.
yehosaphat
Senior Member
Confirm different. One has lens element that will affect pic quality, the other has light loss issue. To me, I prefer having light loss issue than pic quality and in addition, tubes are screw size indept! Of course, ideally, dedicated macro lens is best
psychobiologist
Senior Member
do deal with the light loss, you now have a slower shutter speed, which is challenging in macro when apertures get stopped down a lot.
- Status
Similar threads
