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01-03-2010, 08:39 AM   #61
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SMC Pentax-A* 400mm F2.8 ED [IF] & 1.7x AF TC

That would be a great combo.


01-03-2010, 08:53 AM   #62
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QuoteOriginally posted by jogiba Quote
That would be a great combo.
It works very well on my A* 300mm f2.8
01-03-2010, 09:15 AM   #63
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For those interested, I tried to compare the "old" Made in Japan version with the "new" Assembled in Vietnam version.

As the weather is pretty dull outside, I tried it on flowers, ie. closeups.

I set the K-7 on a tripod, set the camera to manual focusing and tried my best to set the focusing point to the same spot which is particular sensitive on closeups. I used Liveview in 8x mag to check the focusing.

Here is the result:

K-7, Voigtlander 125, f/8, 10s, 100iso


K-7, DA*300, f/7.1, 3s, 100iso


On the left side is the "old" made in Japan version, on the right side, the "new" assembled in Vietnam version.

By clicking on the image, you get to the full resolution photo.
01-03-2010, 09:28 AM   #64
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I would say they are the same. Like someone said earlier, assembled in Vietnam and Made in Vietnam are two different things. Since it's assembled in Vietnam, the parts could be from Japan and assembled in Vietnam.

01-03-2010, 10:22 AM   #65
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QuoteOriginally posted by GoremanX Quote
Oh it's everything I hoped for. I received it today, and despite the fact that it was near-blizzard conditions out, I still went outside to try it (yay for weather sealing!)

The shooting conditions were horrible, but I managed to salvage a few interesting shots:
https://www.pentaxforums.com/forums/866528-post22.html
Good shots considering the weather.
We got hit too here in Le Bas Saint-Laurent!
JP
01-03-2010, 10:24 AM   #66
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QuoteOriginally posted by tcom Quote
For those interested, I tried to compare the "old" Made in Japan version with the "new" Assembled in Vietnam version.

As the weather is pretty dull outside, I tried it on flowers, ie. closeups.

I set the K-7 on a tripod, set the camera to manual focusing and tried my best to set the focusing point to the same spot which is particular sensitive on closeups. I used Liveview in 8x mag to check the focusing.

On the left side is the "old" made in Japan version, on the right side, the "new" assembled in Vietnam version.

By clicking on the image, you get to the full resolution photo.
So, it does seem that both are nearly 100% the same, in results anyway.
Is this "new" assembled-in-VietNam version available somewhere?
JP
01-03-2010, 12:03 PM   #67
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QuoteOriginally posted by jpzk Quote
Good shots considering the weather.
We got hit too here in Le Bas Saint-Laurent!
JP
oh I know, that's actually where I live. I spent the day in Burlington, VT and then had to drive home to Canada through this crap in the evening. I only just finished shoveling the driveway.
01-03-2010, 12:12 PM   #68
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QuoteOriginally posted by jpzk Quote
So, it does seem that both are nearly 100% the same, in results anyway.
Is this "new" assembled-in-VietNam version available somewhere?
JP
I found mine on ebay on SMC PENTAX F AF 1.7X ADAPTER K20D K200D K100D K10D K110 - eBay (item 200284488123 end time Jan-29-10 01:15:07 PST)

01-03-2010, 12:18 PM   #69
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amazon.co.jp do sell them as well:

Google Translate
01-03-2010, 01:28 PM   #70
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Thanks for the link. Just checked it out: expensive, isn't it?

JP
01-03-2010, 02:33 PM   #71
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Sigma 120-400mm and Pentax 1.7x AFA teleconverter

I did a quick test with my K20D and newish Sigma 120-400mm and can report the following:

1) The camera does not recognize the lens and requires focal-length input (as expected)

2) The converter does not power the lens SDM focus motor (as expected)

3) Adapter focus works well in moderate light conditions, but requires some manual pre-focus

4) Exposure seems to be accurate

I haven't taken a close look at the results for picture quality, but confirm that the teleconverter does work with the Sigma lens.

Mike
01-03-2010, 02:49 PM   #72
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1) is a good thing - isn't it? Since we can input the real, 1.7x focal length and not the one reported by the lens - thus allowing for a more accurate SR.
01-03-2010, 03:13 PM   #73
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Did he have them in stock when you bought yours. He's now telling me (even though it shows 2 available) that they are out stock. I'm trying to decide whether to go ahead with purchase or cancel it.

Thanks!!
01-03-2010, 03:14 PM   #74
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QuoteOriginally posted by Stringmike Quote
I did a quick test with my K20D and newish Sigma 120-400mm and can report the following:

1) The camera does not recognize the lens and requires focal-length input (as expected)

2) The converter does not power the lens SDM focus motor (as expected)

3) Adapter focus works well in moderate light conditions, but requires some manual pre-focus

4) Exposure seems to be accurate

I haven't taken a close look at the results for picture quality, but confirm that the teleconverter does work with the Sigma lens.

Mike
Am very curious as to how the photos turn out. I have the 120-400 and would like to use this on it.

Thanks!!
01-03-2010, 03:25 PM   #75
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QuoteOriginally posted by jogiba Quote
That would be a great combo. [400/2.8 pic here]
I'll never forgive myself for not picking-up the one I saw being sold @ Adorama; it did have a very tough life by the looks of it, but was quite affordable.
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