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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Jul 2014 (Friday) 09:27
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Protect fish eye lens?, chicken close-ups

 
hania
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Jul 26, 2014 05:12 |  #16

RandyAC wrote in post #17056407 (external link)
Actually, I was wondering what the risk really is. Lenses are pretty tough. Chicken beaks may not be all that hard or sharp that they'd really damage the lens. Maybe you could do a test with a cheap lens or a filter on some other lens before using the fisheye.

good idea...


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hania
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Jul 26, 2014 05:13 |  #17

KirkS518 wrote in post #17056551 (external link)
Having used the Rokinon 8mm FE for almost the exact same thing, I can tell you with the utmost certainty that your lens will be fine.

QUOTED IMAGE

QUOTED IMAGE

Many thanks - I was sure someone must have done pretty much the same...


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hania
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Jul 26, 2014 05:14 |  #18

GeoKras1989 wrote in post #17056408 (external link)
Frying pan, Drake's batter mix, Crisco oil. The chickens will leave you lens alone. Guaranteed.

:D......we do have a lot though.....not sure I could eat 30,000 chickens ...(free range)


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hania
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Jul 26, 2014 05:16 |  #19

KirkS518 wrote in post #17056894 (external link)
I'm with Dre on the above. I had dozens of ibis's pecking bread off my lens, and not a single scratch. And as for fingerprints, etc., there were breadcrumbs on the lens in both of those shots, and they are not visible or affect the image quality.

hania, I think you're going for the shot I was trying to get with the ibis's. I think you'll have better luck with the chickens. Don't sweat the lens getting damaged, it won't happen.

Many thanks - its a sigma (my only non-canon lens) so not a massive tragedy if it does eventually get damaged..(got it hardly used at half-=price)


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Jul 26, 2014 08:23 |  #20

Really? A pritection filter would be enough. Cmon a chicken breaking a filter and damages the lens haha. They are not that though animals. Had a few and they have hard picks, but it must be a mutant chicken to break glass


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Jul 26, 2014 09:33 |  #21

DreDaze wrote in post #17056885 (external link)
i'm sorry...but i disagree with just about everything written here...first of all...dust isn't showing up in photos...i also doubt fingerprints and scratches are going to have any major impact...and where did you pull this $900 number from?...that'd be the most expensive repair i think i've heard of...

A few years ago, I bought an 8-15mm from a POTN member that had a few hairline scratches. ( I returned it.) The scratches are on all the photos that I was shooting at f8. If I have time today, I will put a fingerprint on my new 8-15 lens and show you the results. Dust on the lens will show too. The reason is because on a 8mm fish eye, the DOF is so great, the front element is nearly in focus. Hence probably one of the reasons why the OP wants to photograph chickens pecking with this fisheye lens.

Naturally, I went to canon in Hollywood to get a quote to replace the front element. With a CPS membership, it was still $900 to replace the front element. (I don't have the quote on paper anymore) Apparently, the front element is a lens module that includes several glass elements.


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Jul 26, 2014 10:39 |  #22

Here is a shot of my ceiling at 8mm f16. Focus is on the ceiling fan about 7 feet from camera. This shows clearly the fingerprint on the lens. Imagine if I had the focus at 3 feet away. The fingerprint will show even much more sharper. From my experience, at f8 it will show too, but blurrier. At f4 you will see it like a faint smudge mark.


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Jul 26, 2014 11:23 |  #23

I think that's a pretty unusual situation to show a finger print. How often are shooting an 8-15 at 8mm on a full frame camera, at f/16, into a bright light? I have a 15mm FE on a full frame camera and have never seen anything on the front element. I don't think I've ever stopped down that far since the DOF at even f/4 is pretty deep.




  
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Jul 26, 2014 11:46 |  #24

mike_d wrote in post #17057429 (external link)
I think that's a pretty unusual situation to show a finger print. How often are shooting an 8-15 at 8mm on a full frame camera, at f/16, into a bright light? I have a 15mm FE on a full frame camera and have never seen anything on the front element. I don't think I've ever stopped down that far since the DOF at even f/4 is pretty deep.

Firstly, there is a huge difference between 8mm and 15mm. A fingerprint may not show on a 15mm lens. Secondly, when you shoot full fisheye, the sun will be your glare source and the fingerprint will show, even at f8. Thus it is a common situation to have a glare source with fish eye lens.


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Jul 26, 2014 11:53 |  #25

I just did a test. I cut the corner off a Post-It and stuck it to the front of my Canon 15mm FE with a 5D3. The piece of Post-It is 5mm long on the diagonal side.

I shot this laying on the floor below an 8' ceiling. I manually focused at the minimum and stopped down to f/16. Even then, the fan is more in focus than the Post-It. I did another shot with a thumb print but nothing showed up. The little dark spot to the right near the window is on the sensor, not the lens.

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Jul 26, 2014 12:09 |  #26

That's good. My 16-35 doesn't have a fingerprint problem either unlike a 8-15mm lens @8mm


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Jul 26, 2014 12:33 |  #27

snake0ape wrote in post #17057243 (external link)
A few years ago, I bought an 8-15mm from a POTN member that had a few hairline scratches. ( I returned it.) The scratches are on all the photos that I was shooting at f8. If I have time today, I will put a fingerprint on my new 8-15 lens and show you the results. Dust on the lens will show too. The reason is because on a 8mm fish eye, the DOF is so great, the front element is nearly in focus. Hence probably one of the reasons why the OP wants to photograph chickens pecking with this fisheye lens.

Naturally, I went to canon in Hollywood to get a quote to replace the front element. With a CPS membership, it was still $900 to replace the front element. (I don't have the quote on paper anymore) Apparently, the front element is a lens module that includes several glass elements.

Well I was totally wrong there :)


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Jul 26, 2014 15:04 |  #28

davidfarina wrote in post #17055502 (external link)
A protection filter maybe?

Or does the lens take no filters? Then you could always get a step up ring or similiar and put the filter on that one

For a real 180° fisheye plane filters in front of the lens will heavy vignette.
Glas domes could work.


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Jul 26, 2014 15:47 |  #29

DreDaze wrote in post #17057532 (external link)
Well I was totally wrong there :)

Me too... :oops:


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Jul 26, 2014 18:08 |  #30

KirkS518 wrote in post #17057829 (external link)
Me too... :oops:

And many of us learn something as a result.
Win win.


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Protect fish eye lens?, chicken close-ups
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