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And for those who want to know why you simply can't shrink down sensor...
Depth of field
The mind numbing diffraction & sensor article

PS Waloshin, your appear to be using the kit lens 18-55; which is a good all around lens but not a very fast lens f/3.5 at it's fastest and only at 18mm, at 50mm it's f/5.6. Do you have any other lenses? A 50mm f/1.8 is a nice fairly fast lens, a prime (usually sharper than a zoom) will give you more control over DoF.
http://www.kenrockwell.com/nikon/5018daf.htm

50mm is a popular lens, so much so there is a Toronto 50mm only photography meetup group.

Haha funny you mention the 50mm Prime lens. I just picked one up.

344xdsk.jpg

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Indeed. And you need different apertures to get the same depth of field too. 25mm f/1.0 at 10 feet on m43 has the same DoF (but not CoC) as a 5D MkII with a 50mm f/1.0 lens at 10 feet. And should have pretty much the same view as well I think.

Surely this is wrong? The depth of field on the m43 will be around 0.4m and the 5d will be much shallow at around 0.2m so whilst the FOV will be similar the depth of field will not be.
 
Surely this is wrong? The depth of field on the m43 will be around 0.4m and the 5d will be much shallow at around 0.2m so whilst the FOV will be similar the depth of field will not be.

I meant f/2.0 on the 5D. I should leave this thread alone: I'm making so many mistakes :p
 
If anyone is interested canon do a nice app called (not very catchily) canonSGlens

it has all the mtf charts lens and DOF calculations etc listed on..using that it says>

for a canon 5d/5dmk2 at

Focal length 50
Aperture 2.8
subject distance 5m

the hyperfocal distance is 25.51m
near limit of acceptable sharpness 4.187m
far limit of acceptable sharpness 6.204m

Total DOF 2.016m

With the same focal length aperture and subject distance a 600d/550d/500d gives

hyperfocal 41.157m
near 4.463
far 5.684
Total DOF 1.22 m

So a crop sensor has a shallow DOF for the same 50 mm lens....HOWEVER the 50mm on the 5d will be much wider...if you wanted the same shot as the 5d/5d mk2 using a 600d/550d/500d you would (assuming 1.6 crop factor) need around a 31mm lens.

A 31 mm lens on a 600d/550d/500d gives:
hyperfocal 15.82
near 3.805
far 7.29
total DOF 3.485

so to get the same framing in a shot the 600d/550d/500 would have a larger DOF.

For the OP a good way to get blurry shots is use a wide aperture..a 50mm 1.8 is pretty cheap..

Get as close to your cat as you can, that will help. Use a wide aperture. Try to make the background as far away as you can, the further away the more blurred it will be. Also the greater the focal length the more blur, but unless you have deep pockets will mean a bigger aperture.

Shot with a 50mm and a canon rebel
dof128.jpg
 

Look at your lense cap. Somewhere (hopefully) and probably inside there will be a number that looks sorta kinda 052mm (except that the 'zero' may have a diagonal line through it). This number tells you the diameter of the lense cap, and therefore the diameter of the front of your lense. This is an important number to know, since some accessories like lense-hoods, are specific to this measurement.

It looks like the lense hood you linked to is a 52mm (or 052mm in lense-hood-ese). I don't know the diameter of your lense, but you can look it up.

However... you ain't done yet. Lense-hoods are also specific to the focal length of the lense. Though not as critically as the diameter. That linked lense-hood didn't appear to list the focal lengths that it was designed for.

A lense-hood designed for a longer lense than the lense used will likely cause vignetting in the corners of the frame. The bigger the mismatch, the more obvious the effect. A minor mismatch may not be noticeable at all. So.. if that linked lense-hood is designed for a lense with a 35mm focal length (*not* the diameter) then it will likely cause your corners to darken... perhaps unaccceptably so.

A lense-hood that is put on a longer lense than it was designed for will not cause any direct image impairment. But... it may not protect the front of the lense adequately in certain situations. Basically, it is not doing its job properly.

Your best bet is to take the lense in question to a camera shop. Try the hood on and read the package. If you need to do mail-order, use someone like Henry's or Vistek. I'm sure there are others, as well. But you can call a camera shop and they will make sure you get the right lense-hood for that lense. If you have a serious camera shop in your area, see if they have a used section. There are almost always lots of used lense-hoods in a bin if the shop deals with used gear. A used hood will be cheap. If you get to Ottawa there is a great used camera gear shop on Bank, just a few blocks north of Vistek.

Luck.
 
Would this lens hood work with my Nikkor 50mm 1.8fD lens?

Probably, but I'm not sure you need it. The Nikkor 50mm f/1.8 D has a very recessed front element, so it isn't prone to flares unless the sun is in the frame (which a lens hood won't protect against). A lens hood probably helps in some circumstances, but I have this lens and haven't noticed needing one.
 
dude, that is awesome

Thanks!

Very cool. Card stock cutouts over the lens?

Yeh. I was fortunate enough to have access to the Canon 85mm f1.2 which has a huge physical aperture so I could have some more leniency when cutting out my words.

Tempted to do this better in a few years and actually laser cut out some words.
 
Shot this last year at this time!

https://vimeo.com/21172373

Yup, very cool !


Probably, but I'm not sure you need it. The Nikkor 50mm f/1.8 D has a very recessed front element, so it isn't prone to flares unless the sun is in the frame (which a lens hood won't protect against). A lens hood probably helps in some circumstances, but I have this lens and haven't noticed needing one.

I also have this lens, and I have never had flare problems.
 
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