Alley in Pisa, Italy

by Lars Kotthoff

submit your photo


Hall of Fame
View past winners from this year

Please participate in Meta
and help us grow.

90,812 reputation
3186329
bio website mattgrum.com
location
age
visits member for 3 years, 10 months
seen 54 secs ago

Jun
17
awarded  Enlightened
Jun
17
awarded  Nice Answer
Jun
17
comment Variable focal length for macro lenses?
I never said the focal length was the same at all focus distances (as this is not true of any Canon lens I know of), merely that I believe that the focal length at 1x is likely to be 65mm, which is why Canon market the lens as being a 65mm lens. That is all.
Jun
17
comment Why is the Canon MP-E 65mm F/2.8 Macro Lens not called a zoom?
@MichaelClark very interesting I'd not seen an example of the how the focusing mechanism works in that lens before. I've updated the answer accordingly.
Jun
17
revised Why is the Canon MP-E 65mm F/2.8 Macro Lens not called a zoom?
deleted 236 characters in body
Jun
17
comment Variable focal length for macro lenses?
Canon will have stated the focal length as measured (or more likely simulated) with the lens at its most distant focus setting, like they do with all of their lenses (which also vary their focal length as you change focus).
Jun
17
revised How was this picture of a model on a boat with a sunset in the background created?
added 96 characters in body
Jun
17
answered How was this picture of a model on a boat with a sunset in the background created?
Jun
17
comment How was this picture of a model on a boat with a sunset in the background created?
Looks low contrast to me, there are no pure blacks or whites in the image that I can see.
Jun
17
comment How was this picture of a model on a boat with a sunset in the background created?
How on earth can you tell the sharpness of this image from a 1024 x 682 sample? I've had completely out of focus images that look just fine when downsampled to this resolution and sharpened. I can't see anything to suggest any particularly capable gear was used, just some very evident post processing.
Jun
15
comment Variable focal length for macro lenses?
Focal length is a measure of how much light is bent by a lens
Jun
15
comment Why does flash exposure compensation of 4EV have such an unnoticeable effect?
@KartickVaddadi Probably not, it's a fairly limited use case, get yourself an external flash and you can manually pop it as many times as you like during the exposure!
Jun
15
answered Why does flash exposure compensation of 4EV have such an unnoticeable effect?
Jun
15
comment Variable focal length for macro lenses?
@MichaelClark that's not true, the lens can focus collimated light - just not at the distance where the sensor in a DSLR is. If you put a 65mm lens from a mirrorless camera on a DSLR it wont focus to infinity, but that doesn't mean that lens is somehow no longer a 65mm lens! Focal length is an intrinsic property of the lens (every lens) and has nothing to do with the purpose of the lens or what camera system it is mounted to, or field of view.
Jun
15
comment Variable focal length for macro lenses?
@Julian Canon says it is a 65mm lens because it is a 65mm lens, it focuses collimated light at a distance of 65mm from the rear principal plane, which is the one and only definition of focal length.
Jun
15
awarded  Enlightened
Jun
14
awarded  Nice Answer
Jun
14
comment How much fluorescent/CFL power do I need?
It depends entirely on distance, the inverse square law can be your friend, get the light 4 x closer and it will be 16 x brighter!
Jun
9
answered How to recreate the perspective and field of view of an existing photo?
Jun
6
comment M.Zuiko 14-42 kit lens @ 25 mm on Olympus PEN E-PL1 with EV-2 finder does not have a 50 mm field of view
I've updated my answer in response to your edit