Extension tubes for 70-200

Which ones should I get? which shouldn't I get? preferably from adorama OR B&H please.

Aperture1.4 wrote in post #12595088
Which ones should I get? which shouldn't I get? preferably from adorama OR B&H please.

I just bought the set of three made by Kenko from B&H. They come thurs. I'm going to try them on the 70-200, 24-70 and 50.

I tried a set of the Kenkos on my 70-200 today. Reduced MFD to a ridiculous 8ish inches. Shots were sharp and aperture was retained, which shocked the shop owner. He swore it would change.

huntersdad wrote in post #12595156
I tried a set of the Kenkos on my 70-200 today. Reduced MFD to a ridiculous 8ish inches. Shots were sharp and aperture was retained, which shocked the shop owner. He swore it would change.

You woild recommend them then? Care to post some shots?

I knew you were gonna ask for shots - I deleted them about 30 minutes ago. I would recommend them based some in-store testing. They seemed solid and well made. I was using all 3 of them for my test shots so I didn't test them individually. Now that I think it over, 8 inches was probably too much a difference. Probably closer to 1.5ft, but that's from almost 4 feet. I also didn't test them at any other FL given what they are used for I figured that the 200 end would be the spot.

As a side note, I then went back to work and found the formula for calculating what the new MFD was. Practically impossible to do. But it is really shortened.

huntersdad wrote in post #12595156
I tried a set of the Kenkos on my 70-200 today. Reduced MFD to a ridiculous 8ish inches. Shots were sharp and aperture was retained, which shocked the shop owner. He swore it would change.

The 68mm Kenko set reduces my 70-200 f/4 IS MFD to ~28"...i'd kill for your set!

1Tanker wrote in post #12596159
The 68mm Kenko set reduces my 70-200 f/4 IS MFD to ~28"...i'd kill for your set!

I misestimated my changes - but, yes, that would be nice. I forgot the tubes were about 4" long and the subject distance was about the same. I'd still estimate 16-18 inches MFD as compared to the original 48 inches.

Aperture1.4 wrote in post #12595175
You woild recommend them then? Care to post some shots?

Here are a couple shots with Kenko 36mm (maybe the 20mm was on too, but I think just the 36mm) on 70-200 f/4 IS on 5D2, my first attempt ever with them on a regular lens actually, from today:

Natural lighting. AI Servo AF. IS on. 1/320th, ISO400, f/8, 200mm. Very slight cropping:

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Wow, those look great,Ill look more into them!! Thanks guys!

Why pay more when you can them below from a reputable vendor:

http://cgi.ebay.com …ain_0&hash=item​20ba40ce30

Silverfox1 wrote in post #12603359
Why pay more when you can them below from a reputable vendor:

http://cgi.ebay.com …ain_0&hash=item​20ba40ce30

Their shipping times are 3-4 weeks from DoP. I'd pay the extra to have it a little sooner than that.

Also look at the zeikos. They are cheaper due to them being made out of composit (Aka really strong plastic). They work great in my 70-200f4 and at just $68 are a great deal.

huntersdad wrote in post #12603448
Their shipping times are 3-4 weeks from DoP. I'd pay the extra to have it a little sooner than that.

Thats not true in my ordering experiences with these vendors. I ordered them and got them in 10 business days or two weeks delivered here in Texas.

The vendor below is also about 10 days for delivery on their items that i have ordered in the past:

http://cgi.ebay.com …enses&hash=item​2a101de756

Your money not mine !

huntersdad wrote in post #12595156
I tried a set of the Kenkos on my 70-200 today. Reduced MFD to a ridiculous 8ish inches. Shots were sharp and aperture was retained, which shocked the shop owner. He swore it would change.

The actual aperture of your lens is entirely unaffected by tubes, but the amount of light that reaches the sensor is still reduced. Your cameras exposure system will detect the light fall off still and will automatically allow for it, causing you to use a slower shutter speed or higher ISO. The difference between an actual reduced aperture and light fall off due to increased distance from lens to sensor plane is a subtle but important difference.

Go to the "Lens extension & Effective F-Stop" section of this link to get a more complete explanation:

http://www.cambridgein​colour.com/tutorials/m​acro-lenses.htm

Silverfox1 wrote in post #12603359
Why pay more when you can them below from a reputable vendor:

http://cgi.ebay.com …ain_0&hash=item​20ba40ce30

Yeah, I thought about that, but some people who ordered from HK have had like 4-8 week delivery times for this and I didn't want to miss the dragonfly season, some early species will be hard to find in even one more week. I mean maybe you luck out and it arrives in 1-2 weeks but I decided to spend the extra $30 and get it overnight from Brooklyn to be safe, since the longer delivery times do happen just enough to wonder.