D70s - Which lens to buy first?

Thanks Luiz, nice explanation in that link.

You're right, I'm really talking about using this lens as a close-up and not a macro. Now, if I were to use this lens with a macro port instead of a dome, would it's reproduction ratio be increased by the change in refractive index (ie, 1.33) so that it would have the equivalent angle of view of a 73mm (1.33x55) lens? And would this increase the max reproduction ratio to 1:2.4 (3.2/1.33)?

Finally, I'm a bit confused about how the close-up diopters on a zoom effect the angle of view with dome ports. From your link...

"[With zoom lenses] the port cannot be set-up for true wide-angle work, because the lens entrance pupil moves with the zoom control. The solution is simply to cancel the de-magnifying effect of the port by adding an approximately equal and opposite magnifying lens."

Now, if adding + diopters "cancels the de-magnifying effect of the port," do you no longer get the benefit of the port maintaining the same angle of view UW as above water?

Thanks for you help. Off to Thanksgiving turkey.

I use the 12-24 mm for WA and the 60 mm for basic macro and fish shots. The 105 mm is good for shy critters and working in gin clear water as well as shooting high magnification stuff using accessories such as diopters and teleconverters.

Those are my primary lenses!

I also have the 10.5 mm and 16 mm fisheyes, and a 14 mm, but I only uses them for situations which require super WA work, like wrecks, over/under shots and CFWA ( close focus wide angle ). The 10.5 mm and 16 mm are fisheye lenses and therefore will distort the image around the outer perimeter of the frame. more so with the 10.5mm. I avoid using these when shooting near the surface unless I want the distorted horizon.

for ports, of course flat for Macro and a Dome for WA and zooms, ( Bigger is better ). For traveling these days with the airlines reducing baggage weight, I suggest you get a housing that uses extension rings to match ports to different lenses instead of having to get a separate port for each lens.

I suggest you get a housing that uses extension rings to match ports to different lenses instead of having to get a separate port for each lens.

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Hi Chris,

I take it that you are suggesting I choose a housing other than Ikelite. Is that correct?

Kind regards,

Ellen

HI

I quite agree with Chris on the Size weight ports issue.

I used to be an ikelte user, But exactly the above stopped me due to Airline luggage restrictions.

Now i just have

1x Dome port

1x Macro port

1x extension ring

this covers

18-70mm

15mm FE

60mm

60 & 2x TC

10-20mm Sigma

12-24mm Nikkor

basically whatever i wish in 2 ports.

if your going to restrict yourself to a couple of lenses or don't plan on travelling then you have no worries.

As for the First time lens

I've used the KIT 18-70MM AF-S and got some excellent results. so below, I can well recommend using that lens as a general purpose tool.

All shot with 18-70mm & +4 Dio.

Regards

Craig

We will offer extension ring port system after first of year, but cost is about the same for flat ports. Present system allows us to do tricks like manual focus on 100mm Canon macro for example. Try that on other housings. An extension ring is about the same size as a port, so fill second port with socks when traveling.

Great to know that Ikelite will offer extension rings. This will allow Ikelite users to save a lot of space.

About the other things, I am not that familiar with the Canon system, but as far as I know, you can do manual focus on the 100mm Canon in any housing (I am sure you can with the Subal), and not only on the Ikelite. Also, extension rings are *a lot* smaller than ports. My flat port with the extension ring attached is the same size as a port for the 105, and that's how I travel with it. So, there is no way that a port for the 60 plus a port for the 105 is the same size as a single port for the 105.

The larger space saving is not with the flat ports, but with the domes. I travel with one 6'' wide dome that can be used with several lenses depending on which extension ring I use behind it.

Thats some great news Ike, Only thing is now you're going to make me spend a lot more money after the first of the year <_<

Oh well, I think for one thing it will be woth it

got to remember to proof read these things be for posting

Stephen

We will offer extension ring port system after first of year, but cost is about the same for flat ports.  Present system allows us to do tricks like manual focus on 100mm Canon macro for example.  Try that on other housings.  An extension ring is about the same size as a port, so fill second port with socks when traveling.

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I have to agree with Rocha on this one.

I shoot the Canon 20D and the 100mm in the Aquatica Housing and can get MF anytime I attach a focus gear. The 100mm being USM allows FTMF with a focus gear when the lens is in AF mode. The extention ring I use for the 100mm with the Aquatica port is about 1 inch thick. I am not sure of the measurements on the Ikelite ports but I think the extention rings would be smaller.