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next PZ Lens Test Report: Samyang 8mm f/3.5 Fisheye
#1
[url="http://www.opticallimits.com/canon-eos/526-samyang8f35eos"]http://www.opticallimits.com/canon-eos/526-samyang8f35eos[/url]



Good performance, great value.
#2
That looks like a lot of fun to use!
#3
Klaus, it's quite a while ago that you tested the Peleng 8/3.5 ...

how would you compare the two?
#4
[quote name='Rainer' date='15 June 2010 - 09:57 PM' timestamp='1276631840' post='545']

Klaus, it's quite a while ago that you tested the Peleng 8/3.5 ...

how would you compare the two?

[/quote]



Well, the Peleng is a circular fisheye which does not cover the full APS-C format. As such it represents already a bigger compromise.



The Tokina/Pentax 10-17mm may be viable alternative - it seems a little sharper in the extreme corners but it produces more purple fringing and it's worse in contra light situations (which is why I rated it lower).
#5
[quote name='Klaus' date='15 June 2010 - 09:21 PM' timestamp='1276633318' post='546']

Well, the Peleng is a circular fisheye which does not cover the full APS-C format. As such it represents already a bigger compromise.



The Tokina/Pentax 10-17mm may be viable alternative - it seems a little sharper in the extreme corners but it produces more purple fringing and it's worse in contra light situations (which is why I rated it lower).

[/quote]

Klaus do you think there is any potential to "trim" the hood of the Samyang and get an 8mm circular fisheye on full frame? Does the lens mount on full frame canons? (some but not all third party APSC canon lenses seem to)

Great review, as usual...
#6
[quote name='DavidBM' date='16 June 2010 - 06:08 AM' timestamp='1276661314' post='551']

Klaus do you think there is any potential to "trim" the hood of the Samyang and get an 8mm circular fisheye on full frame? Does the lens mount on full frame canons? (some but not all third party APSC canon lenses seem to)

Great review, as usual...

[/quote]



No Klaus but ...



the Samyang has (as mentioned in the review) an untypical projection.

Therefore it covers APS-C albeit it has "only" 8mm focal length.

Would you "shave" the hood, the image circle would be too big to be

a circular fisheye on fullframe ... to be a diagonal fisheye on APS-C it needs

an image circle of at least 28-29mm ... to be a circular fisheye on fullframe

it needs an imagecircle of no more than 24mm ... obviously it cannot be

both at the same time.



So if the hoods are removed, the circle would still be cut on top and bottom

of the frame (when used on fullframe).
#7
[quote name='Rainer' date='16 June 2010 - 07:26 AM' timestamp='1276665982' post='552']

No Klaus but ...



the Samyang has (as mentioned in the review) an untypical projection.

Therefore it covers APS-C albeit it has "only" 8mm focal length.

Would you "shave" the hood, the image circle would be too big to be

a circular fisheye on fullframe ... to be a diagonal fisheye on APS-C it needs

an image circle of at least 28-29mm ... to be a circular fisheye on fullframe

it needs an imagecircle of no more than 24mm ... obviously it cannot be

both at the same time.



So if the hoods are removed, the circle would still be cut on top and bottom

of the frame (when used on fullframe).

[/quote]



Yes, and that is the reason why the Peleng has black corners. It's a full frame circular fish-eye, so with it's 24mm

it does not cover the APS-C diagonal.

People do use the Samyang shaved for panoramas, see the links herein:

http://photonius.wikispaces.com/Fish-eye...+Stitching
#8
[quote name='Klaus' date='15 June 2010 - 06:31 PM' timestamp='1276619463' post='541']

[url="http://www.opticallimits.com/canon-eos/526-samyang8f35eos"]http://www.opticallimits.com/canon-eos/526-samyang8f35eos[/url]



Good performance, great value.

[/quote]



Small suggestion about the review "The physical length of the lens remains constant regardless of the focus setting".

This statement is not quite accurate. The lens does actually extend, it's a helical focus drive that moves the whole

lens assembly forward. However, the movement is tiny, i.e. about 0.5mm.
#9
[quote name='photonius' date='16 June 2010 - 09:31 AM' timestamp='1276673516' post='554']

Small suggestion about the review "The physical length of the lens remains constant regardless of the focus setting".

This statement is not quite accurate. The lens does actually extend, it's a helical focus drive that moves the whole

lens assembly forward. However, the movement is tiny, i.e. about 0.5mm.

[/quote]



Are you talking about the inner lens tube or the whole lens (including hood that is) ?

I didn't notice any extension of the overall physical length but maybe I'm wrong.



Thx
#10
I got one of these to play with and also noticed it does extend slightly when focusing closer. It is barely 1mm or less.



Klaus, was your sample's focus scale incorrectly set? I've seen it reported elsewhere so I'm quite sure mine isn't unique, but for sharpest infinity setting I found I had to set it to about 0.7m on the scale. I know with the massive DoF focus accuracy isn't the most important, but it did mean you miss out on a little close focus ability.



Also on the previous question on using it with full frame, here a test shot I did previously on the 5D just to see how the image was without cutting the hood:
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.
  


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