Ordered my new budget lens

[Neil79]

Decided this over the Canon 75-300mm and Tamron AF 70-300mm F/4-5.6 Di LD macro 1:2

Sigma 70-300mm 70-300 f4-5.6 APO Macro Canon fit


To be delivered wednesday!

 

[Neil79]

Just hope it fits my Canon EOS Digital Rebel XT/EOS 350D because i read of chipping issues n such

 

[A.N.Other]

It will go on the 350D without an issue.

For the price, it's a great quality lens. Enjoy it!

 

[Neil79]

Thankyou A.N.Other , makes me feel much better

 

[33L]

you love it i know i do. cracking lens for the money imo

 

[ScarySquirrel]

This is a picture I took with it.

Can anyone explain why the bokeh (is that what it is called?) is hexagonal rather than just a blur?

(SORRY FOR THE SLIGHT THREAD HIJACK BUT I HAVE BEEN MEANING TO ASK THIS FOR A WHILE)

 

[robertgilbert86]

Maybe not enough diaphragm blades?

 

[Messiah Khan]

This is a picture I took with it.

Can anyone explain why the bokeh (is that what it is called?) is hexagonal rather than just a blur?

(SORRY FOR THE SLIGHT THREAD HIJACK BUT I HAVE BEEN MEANING TO ASK THIS FOR A WHILE)

Because it will be using less aperture blades. This means that when you stop down, the hole remaining (The actual aperture) will be a hexagonal shape. The more blades the lens uses the more circular the hole becomes and the more natural and 'creamy' the bokeh becomes. Its not the only factor in the appearance of the bokeh, but its an important one.

For example, this one uses only 7 blades and you can see how hexagonal the aperture is becoming when stopped down(Many lenses use slightly curved blades to help a bit, but you get the idea);

 

[Neil79]

Have to get used to it first

 

[ScarySquirrel]

Because it will be using less aperture blades. This means that when you stop down, the hole remaining (The actual aperture) will be a hexagonal shape. The more blades the lens uses the more circular the hole becomes and the more natural and 'creamy' the bokeh becomes. Its not the only factor in the appearance of the bokeh, but its an important one.

For example, this one uses only 7 blades and you can see how hexagonal the aperture is becoming when stopped down(Many lenses use slightly curved blades to help a bit, but you get the idea);

Great explanation. Thanks. Do more expensive lenses generally have more aperture blades?

 

[A.N.Other]

Great explanation. Thanks. Do more expensive lenses generally have more aperture blades?

Sort of (e.g. Canon's cheapest lens - the 50mm f/1.8 - has 5) but after a point, there are other issues about having more aperture blades when constructing the lens and even Canon's L range of lenses only have 8. The quality of the bokeh depends on the glass etc too.

 

[ScarySquirrel]

Sort of (e.g. Canon's cheapest lens - the 50mm f/1.8 - has 5) but after a point, there are other issues about having more aperture blades when constructing the lens and even Canon's L range of lenses only have 8. The quality of the bokeh depends on the glass etc too.

Great, thanks mate

 

[aztechnology]

err, my hexagons only have 6 sides. 7 sides would make it a septagon, 8 an octagon.. the clue's in the name.

The explanation though is broadly correct as far as I understand it.

 

[ElDude]

Funny you should mention it. There's something about this in either Professional photographer or Amateur photographer this week.

Not that I've been skiving in work and reading them. Ahem

 

[collisster]

err, my hexagons only have 6 sides. 7 sides would make it a septagon, 8 an octagon.. the clue's in the name.

The explanation though is broadly correct as far as I understand it.

ah crap just looked it up septagon is usable