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Using several extension rings instead of one?


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#1 MortenHansen

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Posted 03 April 2012 - 03:01 AM

Hello everyone.

I have a friend (fellow photographer) coming to visit me here in Tulamben, Bali, at the end of the month and I was thinking about getting him to bring a Kenko 1.4 teleconverter to do some super-macro work with my 7D.

Gear that I'm using:
Aquatica A7D housing w. Aquatica Af/Mf flatport+extension and a 100mm f2.8 USM Macro

Now the questions are:

1) How much would I have to extend my port for it?

2) Does any of you have experience/suggestion using 2x "small" extension rings instead of one big? (thinking I can save the money needed to buy another bigger extension-ring)

3) I realize that dome-ports have to have a certain distance to the lens to assure optical quality, does this also go for flat-ports w. macro lenses? (I guess not?)

Thanks for the feedback, Morten L. Hansen

Edited by MortenHansen, 03 April 2012 - 03:03 AM.


#2 bvanant

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Posted 03 April 2012 - 07:28 AM

Hello everyone.

I have a friend (fellow photographer) coming to visit me here in Tulamben, Bali, at the end of the month and I was thinking about getting him to bring a Kenko 1.4 teleconverter to do some super-macro work with my 7D.

Gear that I'm using:
Aquatica A7D housing w. Aquatica Af/Mf flatport+extension and a 100mm f2.8 USM Macro

Now the questions are:

1) How much would I have to extend my port for it?

2) Does any of you have experience/suggestion using 2x "small" extension rings instead of one big? (thinking I can save the money needed to buy another bigger extension-ring)

3) I realize that dome-ports have to have a certain distance to the lens to assure optical quality, does this also go for flat-ports w. macro lenses? (I guess not?)

Thanks for the feedback, Morten L. Hansen

I think that the Kenko PRO 1.4 is about 23 mm long (maybe 24, someone has borrowed mine so I can't measure it right now but I have it written down as 23.5). I often use two exensions but remember that means two seals that could leak. In practice to get teh maximum
magnification your lens should be within a few mm of the port.

Bill

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#3 scorpio_fish

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Posted 03 April 2012 - 09:06 AM

1) I don't know

2) I have done this in the past. I paint a line on all my ports and extensions (started before the body port lock existed). This way I know all my ports are on tight. I don't know all the dimensions.

3) If the combination is too short, the lens will hit or rack into the glass. This is very bad. If it doesn't touch and is a little long, it will be find. If it is way too long, then will lose some ability to get close, but it is still functional. I doubt it will be to long unless one of your extensions is fairly long.

Come to think of it, I've strung 3 extensions together. Lots of failure points.
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#4 blibecap

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Posted 04 April 2012 - 06:16 AM

1) How much would I have to extend my port for it?

Just enough to be sure that the lens doesn't crash into the end of the port. My tele-converter is 19MM long.


2) Does any of you have experience/suggestion using 2x "small" extension rings instead of one big? (thinking I can save the money needed to buy another bigger extension-ring)

Just more leak points and probably not as strong, not suggested.



3) I realize that dome-ports have to have a certain distance to the lens to assure optical quality, does this also go for flat-ports w. macro lenses? (I guess not?)

This only applies to dome ports.
Bill Libecap
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Home of the Housing Sentry, the ultimate leak prevention system.

#5 saga7

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Posted 04 April 2012 - 08:18 AM

Hi I have an aquatica part 18463 extension for sale. That might be the closest extension for size. It is in excellent condition. I would like $150usd plus shipping.
18463
EXTENSION RING
21.5 mm / .82 (overall 34 mm / 1.32)

#6 MortenHansen

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Posted 07 April 2012 - 03:09 PM

Hi I have an aquatica part 18463 extension for sale. That might be the closest extension for size. It is in excellent condition. I would like $150usd plus shipping.
18463
EXTENSION RING
21.5 mm / .82 (overall 34 mm / 1.32)


Thanks for the feedback!

And thanks for the offer, however it would not be an option for me to get anything sent, I am living in Indonesia and the postal service is less than reliable :lol: I will pick up an extension ring and the Kenko next time I drop by Singapore :)

#7 divengolf

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Posted 07 April 2012 - 05:44 PM

Hi I have an aquatica part 18463 extension for sale. That might be the closest extension for size. It is in excellent condition. I would like $150usd plus shipping.
18463
EXTENSION RING
21.5 mm / .82 (overall 34 mm / 1.32)


I looking for a 18462 (39.5 mm / 1.56) Aquatica ext. ring if anyone has one they'd like to part with.

#8 Uli Kunkel

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Posted 07 April 2012 - 06:52 PM

I will pick up an extension ring and the Kenko next time I drop by Singapore :lol:


Yup... I kinda dropped the ball on that one, but I couldn't find them ANYWHERE.
Looking for a Kenko/tamron teleconverter here in Bangkok is like searching for an honest politician.

Does anyone know why that might be? Am I not looking in the right places?

#9 divengolf

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Posted 08 April 2012 - 04:29 PM

Looking for a Kenko/tamron teleconverter here in Bangkok is like searching for an honest politician.
Does anyone know why that might be? Am I not looking in the right places?


Don't look in the US Congress.

#10 bvanant

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Posted 08 April 2012 - 04:40 PM

Yup... I kinda dropped the ball on that one, but I couldn't find them ANYWHERE.
Looking for a Kenko/tamron teleconverter here in Bangkok is like searching for an honest politician.

Does anyone know why that might be? Am I not looking in the right places?

Quick Camera is the Tamron Distributor in Bangkok, (quickcamera.co@gmail.com) they should be able to tell you where to get one
Bill

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www.blueviews.net


#11 Uli Kunkel

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Posted 12 April 2012 - 06:12 AM

Quick Camera is the Tamron Distributor in Bangkok, (quickcamera.co@gmail.com) they should be able to tell you where to get one
Bill


Cheers Bill!

They didn't respond to my email, but I found one through Niks Thailand.