Sigma 12-24 Art Lens f4 vs. Rokinon 12mm f 2.8 with chip
Jun 18, 2018 19:47:10 #
bioteacher
Loc: Brooklyn, NY
I am interested in starting astrophotography and a friend is getting me the Sigma Art Lens. Can I use the Sigma lens for astrophotography or should I buy the Rokinon. Thanks. Neea a reason to buy the Rokinon besides GAS.
Jun 18, 2018 20:49:51 #
The Sigma is a superior lens, but it is a beast, probably heavier than your camera body. For astro, I think the f/4 is a disadvantage. For the Rokinon in astro, you are going to focus manually at infinity and wide open, so you don't need "the chip." I know photographers who've gotten good results with the Rokinon
Jun 19, 2018 04:11:41 #
Jun 19, 2018 04:26:03 #
Pablo8
Loc: Nottingham UK.
rgrenaderphoto wrote:
The Sigma is a superior lens, but it is a beast, probably heavier than your camera body. For astro, I think the f/4 is a disadvantage. For the Rokinon in astro, you are going to focus manually at infinity and wide open, so you don't need "the chip." I know photographers who've gotten good results with the Rokinon
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Interested myself, could you upload Astro' (or other subject)pic's you have taken with these lenses?
Jun 19, 2018 05:15:47 #
bioteacher wrote:
I am interested in starting astrophotography and a friend is getting me the Sigma Art Lens. Can I use the Sigma lens for astrophotography or should I buy the Rokinon. Thanks. Neea a reason to buy the Rokinon besides GAS.
What camera will you be using this on?
The 500 rule divides 500 by the focal length (or effective focal length on crop cameras) to get the longest shutter speed, in seconds that you can use in order to minimize star trails. At 12mm, you will get a 27 sec shutter speed.
https://shuttermuse.com/astrophotography-500-rule-chart/
The difference between F2 and F4 is two full stops - so a crop camera can use a lower shutter speed and/or lower ISO to get good results.
Typical exposure and ISO settings for a crop camera will be ISO 640 - 1250 with an F2 aperture, and 1250-2500 with an F4 aperture. You will likely get better results with the Rokinon regarding star trails.
The Rokinon is also very sharp wide open with low coma, which is great if you are using it for astrophography.
Here is a review that focuses on using the Rokinon for astrophotography.
https://www.lonelyspeck.com/rokinon-12mm-f2-0-ncs-cs-review/
Jun 19, 2018 06:48:54 #
bioteacher
Loc: Brooklyn, NY
Thanks. Using both the 6D Mark II and 80D. How is the Rokinon for everyday wide angle photography? Not sure if I should get the version with the chip or without?
Jun 19, 2018 08:44:14 #
bioteacher wrote:
Thanks. Using both the 6D Mark II and 80D. How is the Rokinon for everyday wide angle photography? Not sure if I should get the version with the chip or without?
It works great as a special purpose lens. Sharp, simple distortion (as opposed to complex or mustache distortion), light, fast. It's a gem for what they sell it for. It has been compared favorably against the Zeiss Touit which is almost 3x the price and one stop slower.
Jun 19, 2018 19:17:12 #
rgrenaderphoto wrote:
The Sigma is a superior lens, but it is a beast, probably heavier than your camera body. For astro, I think the f/4 is a disadvantage. For the Rokinon in astro, you are going to focus manually at infinity and wide open, so you don't need "the chip." I know photographers who've gotten good results with the Rokinon
- If you HAVE the 12-24, then the ONLY reason to get the Roki IS ASTRO. The Sigma can and will do everything else...
Jun 19, 2018 20:02:26 #
The Rokinon lens is great but you don't need the one with the chip for astrophotography. Do some test shots in daylight to work out where the lens is sharpest at infinity. Note this location on the focusing scale and preset the lens before shooting. My lens is sharpest right level with the vertical line just before the infinity mark.
Jun 21, 2018 03:36:42 #
Pablo8
Loc: Nottingham UK.
rgrenaderphoto wrote:
The Sigma is a superior lens, but it is a beast, probably heavier than your camera body. For astro, I think the f/4 is a disadvantage. For the Rokinon in astro, you are going to focus manually at infinity and wide open, so you don't need "the chip." I know photographers who've gotten good results with the Rokinon
Have you found the pic's you have taken with these lenses please.? I'm still interested.
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