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04-19-2011, 05:33 AM   #1
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where can i buy this : AF 1.7x ?

does this teleconverter actually autofocus? and where can i buy one? anyone know?

04-19-2011, 05:42 AM   #2
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QuoteOriginally posted by dh4412 Quote
does this teleconverter actually autofocus? and where can i buy one? anyone know?
Yes, it actually does auto-focus. You attach it between the camera body and the lens, like a normal TC. The focusing mechanism is actually in the 1.7x AF-A itself. The range of focus is somewhat limited, however, so you generally have to prefocus manually close with the main lens and then the 1.7x can focus the rest of the way. There is no AF coupling between the TC and the lens, so it doesn't matter if the lens is MF, screw-AF or SDM-AF.

My understanding is they are still made as of recently but not distributed in the US anymore. As such you would have to buy it from Japan if you want to try and locate a new one. Used ones come up here and on ebay often enough. They're not cheap, and usually sell in the $300-350 range (used), sometimes for a bit more on ebay depending on how badly someone wants on at a particular time.
04-19-2011, 05:42 AM   #3
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SMC Pentax-F 1.7x AF Adapter Reviews - Pentax Lens Reviews & Pentax Lens Database

Try eBay.


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04-19-2011, 05:46 AM   #4
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It does, partly. You have to manual focus in the general vicinity of where you should be, then the AFA takes over and zaps focus .. fast !

You can try EBay or forums but your best bet is the Japanese EBay (or Amazon, I forget which). Costs around US$350 - however I don't know how the Earthquake & Tsunami there has affected supplies.

There are Japanese forwarding companies that for a small fee (around US$20 I think) will buy it for you and then forward it onto the address you have given them. Note that as the AFA contains a minute amount of radioactive material it's somehow managed to get itself banned from direct importation into the USA and Western Europe.

04-19-2011, 08:58 AM   #5
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Others have answered the operation questions. As to where to buy, unless you find a bargain on a new one, I see no advantage to getting a new one over a used one. They turn up in the pentaxforums marketplace quite often. Be prepared however to pay the price. Mine came from an Australian user for $360 IIRC.

04-19-2011, 10:13 AM   #6
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thanks for the replies, do you think this teleconverter is worth the money, does it work well, and those that have it, do you like it?
04-19-2011, 10:22 AM   #7
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QuoteOriginally posted by dh4412 Quote
thanks for the replies, do you think this teleconverter is worth the money, does it work well, and those that have it, do you like it?
Yes, Yes & Yes. Great IQ - if you really want / need this TC and are prepared to pay for it.
04-19-2011, 10:36 AM   #8
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QuoteOriginally posted by Frogfish Quote

There are Japanese forwarding companies that for a small fee (around US$20 I think) will buy it for you and then forward it onto the address you have given them. Note that as the AFA contains a minute amount of radioactive material it's somehow managed to get itself banned from direct importation into the USA and Western Europe.
Based on my understanding there was a large (over the limit) amount of lead used in these. Of course, they could now also be radioactive due to the tragic events in Japan.

04-19-2011, 04:28 PM   #9
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saw on on ebay just a few days ago - might still be there......buy it now option I believe.
04-19-2011, 09:42 PM   #10
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I found 4 of these at a local camera store, old inventory that had never been sold. All brand new with full packaging, all Made In Japan (not Assembled In Vietnam). Bought them all for $200 (total). Sold each one for $450+

Total profit: $1640

Capitalism... it's a beautiful thing.
04-20-2011, 06:09 AM   #11
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QuoteOriginally posted by Hound Tooth Quote
I found 4 of these at a local camera store, old inventory that had never been sold. All brand new with full packaging, all Made In Japan (not Assembled In Vietnam). Bought them all for $200 (total). Sold each one for $450+

Total profit: $1640

Capitalism... it's a beautiful thing.
When I first read your post I thought you bought them for $200/each and I couldn't figure out how much you must have sold them for to net a profit of $1640. Then I noticed you got all 4 for $200! Excellent find!
04-20-2011, 10:27 AM   #12
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QuoteOriginally posted by Hound Tooth Quote
I found 4 of these at a local camera store, old inventory that had never been sold. All brand new with full packaging, all Made In Japan (not Assembled In Vietnam). Bought them all for $200 (total). Sold each one for $450+

Total profit: $1640

Capitalism... it's a beautiful thing.
Isn't total profit only $1,000 since you bought 4 of them for $200 each and selling at $450, so a profit of $250 each making a total of $1000?
04-20-2011, 10:50 AM   #13
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QuoteOriginally posted by GerryL Quote
Isn't total profit only $1,000 since you bought 4 of them for $200 each and selling at $450, so a profit of $250 each making a total of $1000?
See my post one above yours
04-20-2011, 02:19 PM   #14
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QuoteOriginally posted by dh4412 Quote
thanks for the replies, do you think this teleconverter is worth the money, does it work well, and those that have it, do you like it?
A lot depends on what lenses you want to use it with, and what conditions. It's optically excellent and pretty flexible, so it can be very useful. And the Pentax system doesn't offer a lot of choice in longer telephoto.

I sold one after getting it at a good price and testing it out. I didn't have any trouble with it, but for my lenses and usage, the money was better spent elsewhere. If I happened to have the A*300mm f4, this TC would be great.
04-20-2011, 06:20 PM   #15
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QuoteOriginally posted by dgaies Quote
When I first read your post I thought you bought them for $200/each and I couldn't figure out how much you must have sold them for to net a profit of $1640. Then I noticed you got all 4 for $200! Excellent find!
Right, they were $50 each. Apparently a couple other people have come across old stock at $50 also. Seems the stores don't realize what they're sitting on. Their Pentax clientele is so rare, there's no demand.
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