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01-13-2011, 02:49 PM   #1
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Pentax 1.4X-L with FA* 400mm f5.6?


I would like to know could I use Pentax A 1.4X-L teleconverter with FA* 400mm f5.6 lens? Has anybody tested that?

Why asking this is that I remember read somethere that 1.4x-L TC could not be used together with A 400mm f5.6, despite of fact it's longer than 300mm lens.
Either A 400mm f5.6 or FA* 400mm f5.6 are not mentioned in this forum's lens list:

Rear Converter-A 1.4x-L Lens Reviews - Pentax Lens Reviews & Pentax Lens Database

Still that seemed not to be true with A 400mm f5.6 atleast
(because that lens is actually mentioned the tc's manuel:

Also if reading the first link's forum's member has actually used 1.4x-L with A 400mm f5.6. about FA* 400mm and 1.4x-L?

By away...I also owned Vivitar A-22 extension tube set (inc. 12mm, 20mm, and 36mm with KA-bajonet). So if FA* 400mm would not have enought space for 1.4x-L, how about try to use it together with combo (FA* 400mm + 12mm extension tube)? Any sense?

Last edited by Harmonica; 01-13-2011 at 03:42 PM.
01-13-2011, 03:50 PM   #2
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I have never used the 400/5.6 but could go on all day about how well it works with my A*400/2.8. My point being that the A1.4xL does not appear to hurt the IQ of the shots at all. I sure can't say that about the other 4 TC's I have been using. I hope it fits for you.
01-13-2011, 04:01 PM   #3
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I know for sure that it doesn't work with the FA*, but it might work with the A as it has a bigger protrusion. Big might there, though.

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01-14-2011, 03:20 AM   #4
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Perhaps by then optically the best TC choice for FA* 400mm would be 1.4x-s, or?
I have tested that lens with Tamron af TC 1.4X TC, but the results has not been what I would like to see. Same Tamron surely works well with my F* 300mm f4.5....


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