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Kowa Prominar 500mm f/5.6 SL


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#1 Klaus

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Posted 04 February 2011 - 02:37 AM

http://www.kowa-prom...ens/feature.htm


and some more in English:
http://www.kowa-prom...photo101103.htm

Quite interesting lens with a module system and ... breathtaking MTFs actually (if true).

Depending on the configuration:
1x CaF2 (!) element
2-3x elements

dcwatch has more info and samples @
http://dc.watch.impr...204_424620.html
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#2 backcountryskier

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Posted 04 February 2011 - 06:03 AM

Interesting stuff! Bokeh looks a heck of a lot better than reflectors. 500/5.6 would not be easy to operate, manual focus and no IS of course. Any idea of pricing?

#3 genotypewriter

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Posted 04 February 2011 - 06:18 AM

Interesting stuff! Bokeh looks a heck of a lot better than reflectors. 500/5.6 would not be easy to operate, manual focus and no IS of course. Any idea of pricing?

1 fluorite element close to ~90mm in diameter + 2-3 extra low dispersion elements = can't be cheap.

I estimate the prices to be around that of a Sigma etc. 300 2.8 lens or a bit less.

GTW

#4 Klaus

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Posted 04 February 2011 - 08:21 AM

The base units seems to cost just under 2000EUR.
The individual extension modules should be around 200EUR or so.
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#5 AlexanderE

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Posted 04 February 2011 - 12:54 PM

It looked very nice indeed, until I saw the price :P Too much for me at least, but then most things are.

It would be fun to test it though.
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#6 Klaus

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Posted 04 February 2011 - 12:57 PM

It looked very nice indeed, until I saw the price :P Too much for me at least, but then most things are.

It would be fun to test it though.


I canceled the Walimex mirror test, BTW. The measured resolution was well below the minimum mark ...
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#7 AlexanderE

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Posted 04 February 2011 - 03:15 PM

The Walimex?
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#8 Klaus

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Posted 04 February 2011 - 03:23 PM

The Walimex?


A few weeks ago I asked whether there was any interest in a test of a 800mm f/8 mirror lens (made by Walimex aka Samyang).
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#9 AlexanderE

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Posted 04 February 2011 - 03:36 PM

Ah, I see, my memory isn't always good :P

Too bad it wasn't good enough. Would have been interesting.
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#10 genotypewriter

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Posted 04 February 2011 - 11:40 PM

The base units seems to cost just under 2000EUR.
The individual extension modules should be around 200EUR or so.

Wow... my price guess of around or under USD3000 (2200 EUR) was spot on! :D

#11 Klaus

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Posted 05 February 2011 - 11:46 AM

Wow... my price guess of around or under USD3000 (2200 EUR) was spot on! :D


Well, it's still the cheapest (supposedly serious) 500mm prime lens.
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#12 couplos

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Posted 05 February 2011 - 06:23 PM

I canceled the Walimex mirror test, BTW. The measured resolution was well below the minimum mark ...


oups...
does this mean the resolution is "far" beyond a 400/500mm-lens with a 1.4/2*converter ?

kr
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#13 Klaus

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Posted 05 February 2011 - 06:49 PM

oups...
does this mean the resolution is "far" beyond a 400/500mm-lens with a 1.4/2*converter ?

kr
couplos



Yes.


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#14 Brightcolours

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Posted 05 February 2011 - 07:58 PM

2 red rings! That should make it better than that lovely Canon EF 200mm f2.8 L USM!

#15 backcountryskier

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Posted 05 February 2011 - 10:06 PM

Hmmm. I've seen a used Canon 500/4.5 L go for $3400. That's not a lot more money for 2/3 extra stop plus autofocus.

http://www.fredmiran...um/topic/886599

500/4.5 is a rare breed though. Doesn't turn up every day.

#16 Yakim

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Posted 06 February 2011 - 01:51 PM

The base units seems to cost just under 2000EUR.
The individual extension modules should be around 200EUR or so.


I searched and couldn't find a store that sells it. Can you please provide a link?

Thinking about it, this pic does not look too promising, to put it mildly.
Happy shooting,
Yakim.

#17 Brightcolours

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Posted 06 February 2011 - 02:23 PM

I searched and couldn't find a store that sells it. Can you please provide a link?

Thinking about it, this pic does not look too promising, to put it mildly.

It is called softness caused by diffraction. Says nothing about the lens and everything about the camera used.

This does not look half bad (500mm, 7D):
http://dc.watch.impr...ml/075.jpg.html
This looks quite spectacular(350mm, K5):
http://dc.watch.impr...ml/091.jpg.html
This looks good too (500mm, 7D):
http://dc.watch.impr...ml/101.jpg.html
And thjs looks quite excellent (500mm, 60D):
http://dc.watch.impr...ml/102.jpg.html

#18 Yakim

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Posted 06 February 2011 - 02:28 PM

Diffraction at 5.6? It's wide open.
Happy shooting,
Yakim.

#19 Brightcolours

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Posted 06 February 2011 - 02:50 PM

Diffraction at 5.6? It's wide open.

And which camera is used? And what makes that the aperture, with that focal length and f5.6 at 500mm?

#20 Lomskij

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Posted 06 February 2011 - 02:50 PM

Diffraction at 5.6? It's wide open.


According to EXIF, shot was made with a digital compact (Canon IXUS 300 HS), so it is diffraction after all.

Edit: sorry, my post overlapped with the BC's.
SLR Camera, Zoom lens #1, Zoom lens #2, Zoom lens #3, Prime lens #1, Prime lens #2, Prime lens #3, Prime Lens #4, Prime Lens #5, Flash gun.




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