Question about Pentax 1.4xL SMC-A Rear Lens (30943) Lens Converter

1 Answer

Can the 1.4X-L converter A be used with an FA* 400mm f/5.6 lens ?

Projecting front element may be an issue ?

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  • Kim Houlden Dec 04, 2012

    Please advise dimensions of the projecting front element ie diameter/length

  • Kim Houlden Dec 06, 2012

    Can the Pentax 1.4X-L converter A be used with a Pentax FA* 400mm f/5.6 lens ?

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  • Pentax Master
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Consider a few points. Most camera's (The Pentax is no exception here) can only use AF till f/1:5,6. With a tele convertor 1.4 times, your aperture will be twice as small. So it will become 8.
So yes you can use the converter on your Pentax, but the camera can't work with autofocus. If there is enough light, you could be able to manual focus the lens and still make a shot.

Posted on Nov 26, 2013

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I don't know your photography background and skill, so these tips may seem overly basic.

Have you tested this on a tripod? Not using a tripod can add a lot of blur, even while using the IS.
I would also try the lens at f/8 and see if you have the same focus issues. If not, it may just be related to shooting the lens wide open, where it's not the sharpest.
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Sorry, but it's not a DIY fix as the lens will need to be collimated. Without this, you'll just be guessing the correct position and alignment for the loose optical element and won't get your image quality back.

Professional repair and re-collimation will not be cheap though and the lens may not fully recover its former sharpness, so it may be time to let your faithful friend go.

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Your question ( in laymans terms) is unclear! But I will make a guess as to what it is you ask.

The 100-400mm is the focal length of the lens, To use it it has to be attached to the camera It it is capable of focusing clearly on an object at its maximum output as well as its minimum. At its maximum focus it can perhaps ( depending on optical quality) bring an object 4-5 Kilometers into clear view. Most lenses have a zoom factor and a focus ring. Experimentation with the lens will be a better way of defining what improvements it has over a standard 50mm lens

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Auto focus will not work with the 100-400mm 5.6


It's the same 3 as with the 1.4x, but be warned it is likely to be a very unsatisfactory solution in all but the very brightest daylight, and the lens will continually hunt for autofocus - you risk burning out your focussing motor.

If you really want to experiment, hold the converter so the writing on it is the correct way up. Looking at the row of gold pins, rotate the lens so they are at the top, or the 12 o'clock position. It is the 3 leftmost pins you want to cover. Use a piece of sellotape (scotch tape) to cover the three pins, you'll have to cut a thin strip to do it. Be careful as the tape could slip as you attach the converter to the lens adding more risk to the experiment if it gets stuck somewhere it shouldn't!

I tried this with my 2x (version 1) and a 70-200f4/L, it tries to focus but fails with the much reduced light. Might try it outside on a sunny day, but also scared of damaging my lens!

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Hi
Sigma will not repair this lens as the fungs may be in the lens on the barrels and if thay could clean
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cleans lenses let me know if you want to contack him

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