G10 - Wide angle attachment? (underwater)

[verve]

Underwater the 28mm will effectively be 42mm. If I buy the camera, I'd like wider.

For those that have used the wide attachments on the previous G series,
or have experience with underwater.

How good are the wide attachments IQ (optics) on the G9?
I'm willing to bet they won't just fit on the G10 (that would be too easy, lol),
and will require some adaptation/machining etc.

The next question is if a modified wide angle attachment on a G10 will fit in the Canon housing, or if that needs to be modified as well.

Ikelite will have a housing by the end of the month, the G9 housing was released @ $600.00. They also have a 20mm port lens ($300.00).

Of course there is EWA-Marine too if not going deeper than 10m.

V

 

[antispectacle]

The only underwater I've done has been with my old 3mp Sony DSC-P9, but I'm ordering a WP-DC28 for my soon-to-arrive G10. It's Canon's housing, retails for $249, and doesn't look like it has room for a converter and lens..

I'll report back about it when the housing arrives..

edit- EWA looks promising, thanks for the tip.

 

[verve]

No worries. I'd like to hear about Canon's housing. Maybe some larger pix, and how long it took for delivery. (I don't know a store with one in stock).

V

 

[gmata007]

Can you please explain why Underwater the 28mm will effectively be 42mm??

 

[rightside]

Can you please explain why Underwater the 28mm will effectively be
42mm??
--

light moves differently through air and water.
stick a pencil in a clear glass of water.

although what you see is refraction, it is caused by the difference of diffraction in water compared to air

 

[NormanAllen]

I've been wondering the same thing. I know that many people who do underwater photography love the G9 for this. I assume that Ikelite's underwater housing will accommodate the WA attachment, but am not sure about the others. Can't wait to take the G10 down below!

 

[jamesylim635892]

I've been wondering the same thing. I know that many people who do
underwater photography love the G9 for this. I assume that Ikelite's
underwater housing will accommodate the WA attachment, but am not
sure about the others. Can't wait to take the G10 down below!

--

I don't have a G9 camera, oem housing or ikelite housing but from what I have read from other forum..

on G9 you will be able to attach the WA lens on ikelite housing but u need to change the standard port to flat port

The UWL100 will vignett badly on the Ikelite housing (G9) unless you purchase the optional Ikelite flat port ( USD$60).

when using the flat port, you will not be able to zoom in full, because the lens hit the glass on the shorter port.

most wet-mount wideangle lenses are designed to work with a camera with an 35mm field of view. 24mm and 28mm is a bit tricky to get to work without vignetting
INON does make a wet mount WA specifically for 28mm lenses:
but it requires their mount base

personally, i'm planning to get G10 and oem housing with macro lens. with the 28mm lens hopefully we won't need to get extra WA lens except u really want a WWA shots?

 

[verve]

All sounds good James. I guess it depends on the field of view you wish to employ.

If you go with just the 28mm you'll still end up with a x1.5 field of view. I'd prefer going with a wider angle. Though much of what I want to do is very shallow. I may even check out the EWA-Marine bags. Though I don't know if I'll find a wide angle accessory lens for the G10, nor if the EWA has a port which will work with this set up.

Am also still considering the LX3 with 18mm attachment lens - again the port needs to accommodate.

V

 

[verve]

Ok.

Ikelite will NOT have a wider port lens (20mm) for the G10.

Anyone have experience with these attachment lenses? :

http://www.google.com/products?q=wide+angle+lens%2C+G10&btnG=Search+Products&show=dd

Any other suggestion for wide angle attachments for the G10?

V

Underwater the 28mm will effectively be 42mm. If I buy the camera,
I'd like wider.

For those that have used the wide attachments on the previous G series,
or have experience with underwater.

How good are the wide attachments IQ (optics) on the G9?
I'm willing to bet they won't just fit on the G10 (that would be too
easy, lol),
and will require some adaptation/machining etc.

The next question is if a modified wide angle attachment on a G10
will fit in the Canon housing, or if that needs to be modified as
well.

Ikelite will have a housing by the end of the month, the G9 housing
was released @ $600.00. They also have a 20mm port lens ($300.00).

Of course there is EWA-Marine too if not going deeper than 10m.

V

 

[Conchita]

If you're not in a hurry, I'd wait for lensmate to come out with their adapter. They always have a good comparison showing images from different lenses.

 

[verve]

The Dyron WA24-M67 apparently will work with the new Ikelite, transforming it to a 24mm.

http://www.dyron.fr/page_article.php?id_article=25&cat_article=optique&language=2

http://www.scubaboard.com/forums/archive/index.php/t-255303.html
About half way down the thread.

Am wondering if there is a way to customize the Canon WP-DC28 Waterproof Case to accept the Dyron WA24-M67.

V

 

[verve]

I was just informed the Dyron WA24-M67, probably won't fit the current Ikelite housing (which has been backordered). But Ikelite is possibly working on an option for wide angle, and may have info by Christmas

V

The Dyron WA24-M67 apparently will work with the new Ikelite,
transforming it to a 24mm.

http://www.dyron.fr/page_article.php?id_article=25&cat_article=optique&language=2

http://www.scubaboard.com/forums/archive/index.php/t-255303.html
About half way down the thread.

Am wondering if there is a way to customize the Canon WP-DC28
Waterproof Case to accept the Dyron WA24-M67.

V

 

[Stewart Sy]

Not sure where you came up with the conversion factor for a 28mm becoming 42mm. With the venerable Nikonos 15mm water contact lens for the Nikonos 5, it had the same field of view as a housed 20mm SLR (full frame of course). Now, if you're using the current Canon P&S housing, you will be getting a 20% magnification due to the ports optics (you need a dome to negate the diffraction), so a 20% larger field of view of a 28mm lens equates to 33.6mm focal length. Same effect as a diver viewing through the flat glass of a dive mask. If you remember your Open Water course, "Everything underwater looks 20% bigger", that's because of the flat optics of your mask.

s.

 

[verve]

http://www.physlink.com/Education/askExperts/ae337.cfm
The index of refraction for liquid water is 1.33

http://www.camerasunderwater.info/optics/ports.html

The 15mm Nikonos uses a wet dome lens corrected for refraction.
A flat port can increase refraction. There is variation.

Not sure where you came up with the conversion factor for a 28mm
becoming 42mm. With the venerable Nikonos 15mm water contact lens
for the Nikonos 5, it had the same field of view as a housed 20mm SLR
(full frame of course). Now, if you're using the current Canon P&S
housing, you will be getting a 20% magnification due to the ports
optics (you need a dome to negate the diffraction), so a 20% larger
field of view of a 28mm lens equates to 33.6mm focal length. Same
effect as a diver viewing through the flat glass of a dive mask. If
you remember your Open Water course, "Everything underwater looks 20%
bigger", that's because of the flat optics of your mask.

It's not just the flat optics, but that combined with the refractive index of water (1.33). Some apparently say 25%
http://www.ukdivers.net/physiology/eye.htm

V

 

[verve]

New update from Dyron:

"The wide angle Dyron WA24M67 is screwed on a Dyron special port for Ikelite housing for G10. So you take off the ikelite port put the Dyron port and screw the Dyron lens."

V

V

The Dyron WA24-M67 apparently will work with the new Ikelite,
transforming it to a 24mm.

http://www.dyron.fr/page_article.php?id_article=25&cat_article=optique&language=2

http://www.scubaboard.com/forums/archive/index.php/t-255303.html
About half way down the thread.

Am wondering if there is a way to customize the Canon WP-DC28
Waterproof Case to accept the Dyron WA24-M67.

V

 

[Stewart Sy]

So, given that premise, do you then see a more than 20% magnification when you put on a dive mask? I don't think so. Your eye is still prone to seeing effects of refraction. You are simply doubling the refractive index,

 

[verve]

Lol!

Why don't we perceive the sky to get 4x darker when it gets cloudy?

(btw it's 25% ).

But how do you qualify the perceptual differences between 20% -25%, or 33% or 50%?

The law of physics says refractive index for liquid water = 1.33.
Got another law we could consider?

V

So, given that premise, do you then see a more than 20% magnification
when you put on a dive mask? I don't think so. Your eye is still
prone to seeing effects of refraction. You are simply doubling the
refractive index,

 

[verve]

http://ikelite.com/web_two/wd4dome.html

Here it is folks. True wide (28mm)
(Total cost of $950.00 for housing and wide attachments)

V