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Deffered lighting

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Hi. I'm trying to only store the distance of the pixel in view space to save render target space, and I have some problems constructing back the pixel view space coordinate. In the following picture, you can see on the left the reconstructed view space position, and on the right the original view space coordinates: The pixel shader looks like this:
float4 PixelShader(const VS_OUTPUT v) : COLOR
    float3 screenpos = float3(v.texcoord.x * 2.0f - 1.0f, (1.0f - v.texcoord.y) * 2.0f - 1.0f, 1.0f);
    float tanfov_x = tan(90.0f * 0.5f) * (screenpos.x) / fAspectRatio;
    float tanfov_y = tan(90.0f * 0.5f) * (screenpos.y);
    float screenpos_dist = tex2D(Texture, v.texcoord).r; // Stored viewspace distance
    float3 viewspace_pos = float3(tanfov_x * screenpos_dist, tanfov_y * screenpos_dist, screenpos_dist);
    return float4(viewspace_pos, 1);

As you can see from the code, texture coordinates are scaled to be in the [-1..1], then I construct the view space ray with the distance stored before in the deferred rendering phase. Anything wrong? =[dEkS]=

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