September 16, 2014, 01:31:57 AM

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Messages - fiend

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1
Site Information / Re: Can't login using Chrome on my iPad
« on: April 02, 2014, 08:07:32 AM »
I have the same problem in FF, but in Chrome it works alright. I don't want to clear my cookies though! :/

Found out I can delete the cookies only for canonrumors! :D
That solved the problem.

The thing is that it seems to redirect me to the loginpage or something to show me that I'm using the wrong password, but since I'm not logged in or something.. I get that banned message instead.

When I removed the cookie I came to a page that told me to login..

2
Underwater / Re: Over - Under -shot not in focus?
« on: September 25, 2013, 06:05:09 AM »
Ok imagine over distance is ∞ and under distance is 0.5m, where I put the two arrows, turn your focus so the two arrows are equal distance from the focus line, the small numbers below, 8 in this case, are the minimum dof needed to encompass both over and under, but I would recommend at least f11.

Here is your picture edited, I have moved the focus ring to where you would need it to be with the above numbers.

Aaah, sweet! :) that explains it! Sounds good. Is the distance "below" equal to distance above?
I've read something about an "virtual image" that you focus on so the distance below is not the same as above.

3
Underwater / Re: Over - Under -shot not in focus?
« on: September 24, 2013, 08:31:46 PM »
OK, you have the correct port extension, but you should still have some vignetting on the ff 5D MkIII. Anyway,  as a start f4.5 is way inadequate, as eml58 says try f16 and I suspect your problems will be gone.

If not it will take some fiddling, put lens in manual focus and focus on the overwater section, take the housing out of the water dry off the port and take it off to see where you focus is, make a note, then do the same thing with the underwater part. You will end up with two figures, make sure you use dof/aperture value that comfortably encompasses both figures. Done.

If you look at the full res picture you can see that there is no vinjetting or at least as far as I can see :)
Might be a little darker in the corners but that's not bad.
I will try f16 and see if it will be better when I try to shoot with a smaller aperture.

Then I have to be at the correct distance to the object before I put it in the housing? Since I can't manually focus when it is in the dome.

Lets see if I understand it right.
I focus on the object that I want in focus ABOVE the water.. check the reading.. like 1m
Then I put it down in the water and to the same and check the reading.. and I get like 0.3m
Then what? :)

I've attached a picture of the lens with the focus set on 0.5m (focused under the water).
How can I know the aperture/focusdistance to the "over"-object with this? :)


4
Underwater / Re: Over - Under -shot not in focus?
« on: September 24, 2013, 08:01:47 PM »
What lens, port, housing, tube etc?

Canon 5D mk3
Sigma 15mm/2.8 Fisheye
IKELITE housing
IKELITE dome 8" + wide angle adaptor/tube so no vinjetting.

Is the tube part number "#5510.11 port body"?

Yes :)

5
Underwater / Re: Over - Under -shot not in focus?
« on: September 24, 2013, 07:43:59 PM »
Manual Focus, only way.

If you Auto Focus your Focus Point will pick up what ever it's locked onto, underwater area/above water area, you have to Manual Focus for the best compromise between the Underwater section & Above water section.

Another trick is to wipe your Dome (The Housing Dome, not your other dome), with "Rain X Glass", helps make the water droplets not stick to the Dome and becoming a problem with blurry spots in the Image.

Over/Under shots done well are a bit of a suck & sea, lots of practise, but always with Manual Focus, f/16.

I use a Seacam Housing with a 5DMKIII + 8-15f/4 or 24f/1.4, 8-15 @ 15 & f/16, the 24 @ f/16.

Have a look at some of "Lemmyshowyou"s Images on the 1Dx site, maybe PM him and I'm sure he will gladly give you some more advise.

You can't focus on something in the water then?
Manual focus.. so what should I focus on? Then I have to manually focus before I put the lens into the housing but then I can only use the setup for under/over-shots and not for general underwater shots aswell?

I use back button focusing so I don't have to think about the camera "refocusing" when I'm shooting the shots.

Rain X Glass? You can't use just some soap or something that repells the water or makes it more "slick" ? :)
Don't know if Rain X Glass is a product that is available in Sweden where I live.

6
Underwater / Re: Over - Under -shot not in focus?
« on: September 24, 2013, 07:40:32 PM »
What lens, port, housing, tube etc?

Canon 5D mk3
Sigma 15mm/2.8 Fisheye
IKELITE housing
IKELITE dome 8" + wide angle adaptor/tube so no vinjetting.

7
Underwater / Re: Over - Under -shot not in focus?
« on: September 24, 2013, 07:11:27 PM »
Were you using Auto-Focus? At a guess it chose the underwater portion of the frame and since the refractive index of water is quite a bit different than air, and you were using f/4.5, the air part of the frame was OOF.

That's my guess, never had an underwater housing...I'd like to have one though.

Yes, I was using the cameras autofocus when I was shooting these pictures :)
So the thing should be to either try to fix the difference in the refraction-issue-thing or use a better focus point underneath the water.. aswell as a smaller aperture? Like f14-f22 ?

Could be a combination of those. Take a whole bunch at different settings, pop out of the pool and take a close look. It's not like you have to wait a day or two to get them developed and printed :P

The thing is that I'm heading abroad on friday (in 1.5 days now).. so I don't have all that much time over to get into the pool again to shoot more and do some tests :/

8
Underwater / Re: Over - Under -shot not in focus?
« on: September 24, 2013, 07:09:04 PM »
Were you using Auto-Focus? At a guess it chose the underwater portion of the frame and since the refractive index of water is quite a bit different than air, and you were using f/4.5, the air part of the frame was OOF.

That's my guess, never had an underwater housing...I'd like to have one though.

Yes, I was using the cameras autofocus when I was shooting these pictures :)
So the thing should be to either try to fix the difference in the refraction-issue-thing or use a better focus point underneath the water.. aswell as a smaller aperture? Like f14-f22 ?

9
Underwater / Re: Over - Under -shot not in focus?
« on: September 24, 2013, 06:02:35 PM »
Water and air have a different refractive index (different liquids will too, it is how oil is used for microscopy, to refract light enough at high magnification to allow focusing). Most shots I've seen along this idea have been with a fisheye, where the DoF is much greater and where the subject is closer. One in particular is of a lily above and below, although I have also seen one of spawning salmon with a landscapes in the background, but the landscape wasn't completely sharp from memory, it was more of a suggestion of the surrounding environment, just sharp enough.

Is there any way around this perhaps?
I'm using a 8" dome and a 15mm fisheye. Underneath the water everything looked like it was in focus with only aperture f4.5 in this picture.

Perhaps where you focus can have an inpact. Prefocus on a point a third into the picture?

10
Underwater / Re: Over - Under -shot not in focus?
« on: September 24, 2013, 09:08:35 AM »
Ok. By shooting at another angle I meant if the camera was tilted slightly upward or downward. How and where did you focus while taking the shot?

se attached pictures :)

11
Underwater / Re: Over - Under -shot not in focus?
« on: September 24, 2013, 08:58:47 AM »
My guess is that refraction from the water is altering the plane of focus which would explain why the area underwater is sharp. Did you shoot at any other angle?

Any other angle, what do you mean?
Horisontal/Vertical etc?

I shot some split shots but only towards that "corner" of the pool. Didn't want to offend or disturb any other people swimming in the other sections :)

12
Underwater / Over - Under -shot not in focus?
« on: September 24, 2013, 08:41:31 AM »
Hi!

I've tried out my underwaterhousing today at the indoor swimmingpool :)
It worked out great!

But when I tried to do some Over/Under-shots all the over-part was WAY out of focus. Is it supposed to be like that? Aperture was 4.5 and I guess that with f22 it would be more in focus but almost all the things under water was in focus.

Any ideas?

13
Third Party Manufacturers / Re: DIY filterholder
« on: September 06, 2013, 07:31:16 PM »
Ben Egbert and I discussed doing a DIY filterholder utilizing the 17's front cap in April 2011. I am not handy so I had to wait until Ben actually did the work and produced a tutorial. (See below). Total cost for parts = $80 or so. You will not ba able to buy the Lee version (if real) for 4x this number. In the meantime, a bunch of folks popped on the internet with the same or similiar idea. Except for some vignetting in areas of the frame that appear when the shift is too strong, works like a charm.
 
http://ben-egbert-photo.com/?page_id=206#comment-1780

Followed his work on another forum and he later said (I think?) that the thing fell of due to the glue not sticking hard enough. He also mentioned that he would not make another one since the front-cap with the standard-holder was better alternative. Smaller and less vinjeting.
If I'm not all wrong.

14
I would like to see this product hit the market. Sadly I think it will take some time since LEE are not the fastest when it comes to delivery :/

15
This sounds interesting since I both use LEE-filteras aswell I'm about to purchase the 17/4L TSE.

The thing is that I've read on forums by people talking to  LEE that they don't have any plan for that. They did have thoughts about it but they came to the conclusion that they wouldn't produce one.

This is what I will be going for:
http://www.fredmiranda.com/forum/topic/1081875

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