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Thread: Zeiss ZF 15mm lens

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    Zeiss ZF 15mm lens

    Does the Zeiss ZF 15mm lens require a center filter like the zeiss 15mm ZM?
    leo

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    Sr. Administrator Jack's Avatar
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    Re: Zeiss ZF 15mm lens

    No. At f2.8 falloff is fairly prominent, but already low at f4, and at f5.6 or 8 it's all but irrelevant except for the most critical imaging situations. Easy to correct in post too, probably need only a 1 to 1-1/2 stop edge boost to totally eliminate it.
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    Re: Zeiss ZF 15mm lens

    I think center filters are mostly obsolete for modern cameras. I haven't touched my center filters in years...

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    Re: Zeiss ZF 15mm lens

    How do you resolve the 1 1/2 stop fall off in post? With an LCC correction in C1 or a different way?

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    Re: Zeiss ZF 15mm lens

    Here we go. Thought I'd mention that the Compact Primes, in two PDFs it mentions they have no light fall off and are more flare resistant than the ZF.2 DSLR lenses. Except one PDF says both types of lenses are same as far as light fall off is concerned. Expensive, but at least lens mounts are interchangeable.

    Maybe the new hi-res lens range like the 55 1.4 and others will have no light fall off etc......

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    Re: Zeiss ZF 15mm lens

    Quote Originally Posted by Aviv1887 View Post
    How do you resolve the 1 1/2 stop fall off in post? With an LCC correction in C1 or a different way?
    You can do an LCC in C1 or you can use the lens filter for falloff (or other anomaly) corrections in Photoshop or LR, or you can use PTLens. Me, I would build an LCC correction set in C1 for all apertures on the 15 -- it's simple to use at the raw level and does an outstanding job, though admittedly I have not even bothered with it for the 18 yet.
    Jack
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    Subscriber & Workshop Member GrahamWelland's Avatar
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    Re: Zeiss ZF 15mm lens

    Jack,

    Have you had any issues with the LCC creation from NEFs? I found that C1 6.4.3 was producing a light line stripe along the right side of any LCCs I produced when I tried using my D800IR & Zeiss 25/2 or 21/2.8. With a hot mirror UV/IR & standard Zeiss glass there is a colour cast that needs correction and I ran into problems with this in C1. LCCs were shot using my normal CI LCC card just as I do with my Phase or Leaf backs. I didn't see why it would be different with a NEF but it seems so.

    Thoughts? I can find and post an example when I'm home.
    Remember: adventure before dementia!

    As Oscar Wilde said, "my tastes are simple, I only like the best"

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    Re: Zeiss ZF 15mm lens

    Hi Graham:

    My guess is that is an issue with IR reflections, not the LCC specifically? Was your LCC plate absolutely flush against the surface of the lens, meaning no back reflections?

    I'll try to post an example later, but again, I'm only using it for falloff corrections.
    Jack
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    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

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    Re: Zeiss ZF 15mm lens

    Can we just delete this thread. So damn tempting
    Photography is all about experimentation and without it you will never learn art.

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    Re: Zeiss ZF 15mm lens

    Temptation makes life meaningful.

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    Re: Zeiss ZF 15mm lens

    Guy - you know you want one. Just man up and go for it ... And give me a call just before you list it later.

    It'll look great on my D600
    Remember: adventure before dementia!

    As Oscar Wilde said, "my tastes are simple, I only like the best"

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    Re: Zeiss ZF 15mm lens

    Not sure a helmet would be enough protection from the baseball bat. Lol
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: Zeiss ZF 15mm lens

    Oh don't think I missed that D600 comment , I'm going to need to send you steel beams to hold up your camera shelf pretty soon here. LOL
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: Zeiss ZF 15mm lens

    Quote Originally Posted by felix5616 View Post
    Temptation makes life meaningful.
    Can also make me dead meat. ROTFLMAO
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: Zeiss ZF 15mm lens

    Quote Originally Posted by Jack View Post
    Hi Graham:

    My guess is that is an issue with IR reflections, not the LCC specifically? Was your LCC plate absolutely flush against the surface of the lens, meaning no back reflections?

    I'll try to post an example later, but again, I'm only using it for falloff corrections.
    Here's a set of images for LCC - no gaps between LCC plate and lens btw.

    Basic LCC original image:


    Colour Cast removed:


    Colour Cast and Light Falloff:


    Thoughts?
    Remember: adventure before dementia!

    As Oscar Wilde said, "my tastes are simple, I only like the best"

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    Re: Zeiss ZF 15mm lens

    What is the 3rd image, Graham?

    If you recall, I had asked you about the IR LED (near the shutter mechanism) lighting up your frames during long exposures (in your IR converted D800).

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    Re: Zeiss ZF 15mm lens

    Looks like a bug. Did you try moving the light falloff slider down to see if it does it at all amounts of falloff.
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: Zeiss ZF 15mm lens

    Graham,

    My bad, there is a nef bug. I have not used it for a DSLR for a few years now, so my last attempt was probably on Canon. Both 6 and 7 generate the stripe on the right with my test nef. If you dial down falloff, it goes to a thin green line in 7.
    Jack
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    Re: Zeiss ZF 15mm lens

    No worries - I opened a case with Phase One and sent them EIP files so hopefully they'll fix it.
    Remember: adventure before dementia!

    As Oscar Wilde said, "my tastes are simple, I only like the best"

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    Re: Zeiss ZF 15mm lens

    Quote Originally Posted by GrahamWelland View Post
    Thoughts?
    Software bug.

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    Re: Zeiss ZF 15mm lens

    Definitely a bug. It applies just to lightness fall off which is the kicker for a lens like the 15mm if there is a need for a centre filter.
    Remember: adventure before dementia!

    As Oscar Wilde said, "my tastes are simple, I only like the best"

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    Re: Zeiss ZF 15mm lens

    B&H now has a pre-order link for the Zeiss Distagon T* 15mm f/2.8 ZF.2. Expected availability October 16. Guy better knit a few more ski masks.

    Joe
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    Administrator, Instructor Guy Mancuso's Avatar
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    Re: Zeiss ZF 15mm lens

    Damn love to try this out on our workshop. Zeiss you listening, get me one. LOL
    Photography is all about experimentation and without it you will never learn art.

    www.guymancusophotography.com

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    Re: Zeiss ZF 15mm lens

    Not sure to get it. What's the point to use a super quality 15mm lens with no shift option ?
    Use it levelled and you get way too much ground on your pics. Use it pointed upwards and perspective corrections will eat a bit of its magic.
    Using a 15mm lens can be very fun, but a 14-24mm certainly is good enough for that, with far more flexibility and less cost.
    No I don't get it

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