Franz Kerschbaum

Lives in Austria Austria
Works as a Astronomer
Joined on Apr 2, 2001

Comments

Total: 95, showing: 1 – 20
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Here I compared this gem with the Canon 14/2.8II for astro work. Look at the extreme corner comparison and you know ... https://www.dpreview.com/forums/post/59871149

Link | Posted on Nov 15, 2017 at 16:43 UTC as 8th comment
On article Canon 85mm F1.4L IS USM sample gallery (319 comments in total)

We desperately need some Astropics with it wide open like I did in my Sigma Art 85/14 to EF85/1.2 comparison! https://www.dpreview.com/forums/post/58887010

Link | Posted on Nov 1, 2017 at 18:16 UTC as 65th comment
On article Nikon 8-15mm F3.5-4.5E ED fisheye zoom sample gallery (65 comments in total)
In reply to:

Franz Kerschbaum: New for Nikon but for Canon we have this very useful design since 2011 ...

Correct! Also a great lens. Unfortunately Canon only offers the ef 11-24mm f/4.0l usm in that category. So one has to trade field for aperture. Thats why I am so happy with the new Sigma 14/1.8 art, available for both Nikon AND Canon. Here some first astro impressions maybe interesting also for Nikonians: https://www.dpreview.com/forums/post/59871149

Link | Posted on Aug 2, 2017 at 14:31 UTC
On article Nikon 8-15mm F3.5-4.5E ED fisheye zoom sample gallery (65 comments in total)
In reply to:

Franz Kerschbaum: New for Nikon but for Canon we have this very useful design since 2011 ...

Its a great useful design to combine a circular and a rectangular fisheye for both crop and full format in one lens and I am happy that Nikon provides it to its customers as Canon did some years ago. I own it since then ...

Link | Posted on Aug 1, 2017 at 14:38 UTC
On article Nikon 8-15mm F3.5-4.5E ED fisheye zoom sample gallery (65 comments in total)

New for Nikon but for Canon we have this very useful design since 2011 ...

Link | Posted on Aug 1, 2017 at 13:40 UTC as 26th comment | 6 replies

Did some Astrocomparison with the ef14/2.8II here: https://www.dpreview.com/forums/post/59871149

Link | Posted on Jul 24, 2017 at 15:39 UTC as 8th comment
On article Astrophotography with the Sigma 14mm F1.8 Art lens (79 comments in total)

Did also some Astrocomparison with the ef14/2.8II here: https://www.dpreview.com/forums/post/59871149

Link | Posted on Jul 24, 2017 at 15:38 UTC as 3rd comment

Did some Astrocomparison with the ef14/2.8II here: https://www.dpreview.com/forums/post/59871149

Link | Posted on Jul 24, 2017 at 15:37 UTC as 11th comment
On photo Life after Earth 2017 DP in the Life after... challenge (6 comments in total)
In reply to:

Wildbegonia: Felicitations Mario. J' ❤️ ! C'est le Rosette Nebula?

No, its the Gamma Cygni region of the summer sky (Rosette is winter)

Link | Posted on Jun 27, 2017 at 08:30 UTC
On article Analog gems: 10 excellent, affordable film cameras (819 comments in total)
In reply to:

Franz Kerschbaum: The Contax RTS is a classic gem. It had the first electronic shutter and is legacy zeiss lenses still hold their value! http://camerapedia.wikia.com/wiki/Contax_RTS

Unfortunately I sod my RTS for the RTS II which I still own and adore ... http://camerapedia.wikia.com/wiki/Contax_RTS_II

Link | Posted on May 21, 2017 at 15:33 UTC
On article Analog gems: 10 excellent, affordable film cameras (819 comments in total)

The Contax RTS is a classic gem. It had the first electronic shutter and is legacy zeiss lenses still hold their value! http://camerapedia.wikia.com/wiki/Contax_RTS

Link | Posted on May 21, 2017 at 15:31 UTC as 189th comment | 3 replies
In reply to:

Glen78: Really poor timing on this as it sounds like delivery is going to just miss being in time for the August 21 eclipse when these would be useful.

Solar eclipse imaging with a superwide? You will have a few pixels that will be exposed ... (10mm solar imagesize in the focal plae per METER of focal length ...)

Link | Posted on Apr 28, 2017 at 14:11 UTC

In Astrophotography we have such filters for years and they have heir merrits!

http://www.astronomik.com/de/clip-filter-system.html

https://www.cyclopsoptics.com/sales/optolong-uhc-clip-filter-for-canon-dslr/

https://www.optcorp.com/astronomik-eos-full-frame-clip-uhc.html

Link | Posted on Apr 1, 2017 at 19:08 UTC as 7th comment
On article CP+ 2017: Hands-on with Sigma's newest lenses (199 comments in total)
In reply to:

sh10453: Hats off to Sigma's engineers. They have been launching some good stuff.
For those complaining of lugging heavy weight gear, just use your phone.

When needing stabilized 2.8 at 135mm we all use our trusty 70-200mm/2.8 lenses. This new lens provide a very different option.

Link | Posted on Feb 24, 2017 at 12:23 UTC
In reply to:

fyngyrz: For astrophotography, which is my particular interest, two of the most troublesome lens problems are chromatic aberration and coma.

Between the two, the additional light capturing capability of a low f-number lens is either lost, or image quality is severely impacted.

If you want to test a lens, take it out on a moonless night, open the aperture all the way, and shoot some stars, making sure the shutter speed is fast enough, and ISO high enough, so that the stars don't streak and so that faint ones are caught as well as bright ones.

The day you find a lens where the stars in the corners are just as round and sharp as those in the center, and the stars don't have red and blue halos... that's the day you've found a good lens.

I own quite a bit of Canon-L glass. I have yet to find one that's actually very good at any of this. By the time you stop them down to where they actually work reasonably well, you've lost all the advantages of the wide aperture.

It's really annoying.

I made this quick Astro comparison to the Canon 1.2 https://www.dpreview.com/forums/post/58887010

Link | Posted on Feb 15, 2017 at 11:26 UTC
In reply to:

davids8560: I had the 995 and I still have the 4500. Great cameras! But was baffled when they rolled out the S4 and S10VR!

Same with me!

Link | Posted on Feb 2, 2017 at 21:26 UTC
On article Canon EOS M5 added to studio scene comparison tool (87 comments in total)
In reply to:

QuikFrame: I'm a complete novice, but I struggle to understand how to make good use of this information when the lenses themselves differ here.

Moreover I dont understand why they are not using the raw developer that the company provides. It is part of the package typically . DPP by canon especially for new cameras is typically miles ahead of LR ...

Link | Posted on Dec 9, 2016 at 07:55 UTC

Nothing about battery life?

Link | Posted on Oct 14, 2016 at 08:10 UTC as 15th comment
On article Updated: Canon EOS 5D Mark IV real-world sample gallery (486 comments in total)

I never understood why they do not use canon dpp for raw development - the original system that comes with the cam as a package but a beta version of a third party...

Link | Posted on Sep 5, 2016 at 19:18 UTC as 32nd comment | 6 replies

Another abandoned design that I really miss is the swivel body of the nikon coolpix 990 to 4500 cameras. They where my entry to the digital world and I still miss the great functionality at times....

Link | Posted on Aug 19, 2016 at 23:41 UTC as 31st comment
Total: 95, showing: 1 – 20
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