Samyang 8mm

[jreamer]

Hi guys,

I just got this new baby today and here's a quick test shot. I was having fun but was a bit disappointed when I zoomed in to take a peak at 100%. It would seem like my 18-55 kit lens could've done better. I focused to infinity and I'm using f8 and I'm using a 550D. The other pictures I took were 'soft' too. Should I return the lens? The reviews so far is that this lens has superb optics and is super sharp from f8-11. Kindly advise.

1.

100%

P.S. I understand the photos are a bit under exposed.

Heres another test shot:

2.

100%

 

[daredevil123]

Please note that on Samyang lenses, focusing to infinity is not turning it all the way until it stops. You have to turn back slightly.

 

[jreamer]

thanks for the tip. i'll give it another go.

 

[dis28]

Great lens - samyang 8mm , - i own one


To check if your focus ring is correct you should use full aperture.
You should have full sharpness from 0.5meter to infinity by focusing at 1 meter.


maybe it your first time to manual Lens -

here a comparsion of 8mm by tomcat : http://www.clubsnap.com/forums/revi...5-fisheye-sigma-10mm-f-2-8-dc-ex-fisheye.html

 

[jreamer]

Yes. it is my first time using a manual lens. but apart from focusing at infinity and using f8 what else can I do to get a sharp image at 100%?

Are ur images sharp when u zoom in at 100%?

Could you perhaps elaborate what you think was wrong with my settings because I dont see what other settings I can meddle with apart from adjusting the focusing ring and setting the aperture?

Many thanks

 

[Odyssey-Boy]

I would suggest TS to read up on this topic called Hyperfocus distance and scale.

If this 8mm manual focus is TS's first MF lens, I would suggest him / her to get a AF confirmation chip installed. But of course, that would not be 100% accurate at times.

Under exposed or Over exposed, it is not the lens that is faulty or the camera body that malfunction. This is because it is strictly a manual lens. Using AV mode or auto exposure may not be 100% accurate compared to your 18-55. I would suggest you to use bracketing.

 

[jreamer]

thanks for your reply.

I understand the concept of hyperfocal length and that is why i'm even more frustrated because I understand that with 8mm and f/8, there is a very short near focus limit and sharpness that extends to infinity. my pictures though, yield less than desirable sharpness when I crop at 100%.

 

[daredevil123]

thanks for your reply.

I understand the concept of hyperfocal length and that is why i'm even more frustrated because I understand that with 8mm and f/8, there is a very short near focus limit and sharpness that extends to infinity. my pictures though, yield less than desirable sharpness when I crop at 100%.

If you are using hyperfocal distance, you shouldn't be using infinity focus.

Btw I don't have the 8mm but I do have the 14mm. And it is tack sharp even at 100%.

 

[Octarine]

Haven't checked .. but if the 550D has LiefeView you could use this option to verify your focus. Works perfect for me with all manual lenses.

 

[jreamer]

Well i realised focusing at infinity was sharper than at the hyperfocal distance of 0.43m (8mm, f8, 550d apc sensor). Could be a manufacturing defect. should be returning the lens.

 

[albertri]

I have this lens but Sony mount my copy is sharp at hyperfocal or infinity... but normally i shoot around .45-.7m I find this is the sweet spot.