Using several extension rings instead of one?

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

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

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.

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.

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”)

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

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.

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

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?

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.

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

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.