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08-06-2018, 12:04 PM   #1
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50mm f1.7 vs. 24mm f2.8 vs. 18mm f3.5

I'm going to try shooting the Persieds with my K-01.

On line advice says short focal length and wide aperture.

My options are:

Pentax A 50mm f1.7
Sigma 24mm f2.8
Pentax 18-135mm f3.5

Suggestions please.

Thanks in advance.

08-06-2018, 12:43 PM - 1 Like   #2
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I think you'd be best served by either the Sigma or the 18-135, depending on whichever has better performance at a specific aperture. Do a couple of tests that will allow you to find the ideal settings. Compare the two lenses side by side at 24mm and maybe f/4 or f/5.6, and the ISO set to a reasonable value to obtain a pleasing night time image. You'd want to expose for maybe 20 to 30 seconds, and sensitivity set so that a meteor streak can be detected. A plane flyover may give you an idea as to the effect of a meteor on your image.
08-06-2018, 01:20 PM   #3
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From an earlier conversation on another thread the longer lens may give a brighter result even at a higher f/stop. The rationale was pinpoint light sources behave differently. The problem however is that the longer the lens the less of the sky you are viewing. I don't know anything about other factors but I would suggest that the 24mm is the best compromise of the choices.
08-06-2018, 03:27 PM   #4
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Not an expert in the field. But I think it all depends on the composition. If you are going to be including landscape in your photo I think you would want to go as wide as you can. If you are just shooting the stars I think you would want to use longer lenses and pick specific objects to photograph.

Just my 2 cents

08-06-2018, 05:54 PM   #5
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Meteor showers radiate all over the sky from their central point. You want as wide an angle as possible, so if it were me Id shoot with the 18-135 at 18 and either wide open or down a half-stop. 18 is MUCH wider than 24, and that beats the extra half-stop. Also, be sure you know where infinity focus is before you go out in the dark. Tape down the focus and zoom rings to avoid bumping them.
08-07-2018, 06:05 AM   #6
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Wide is good; 24mm works well though for Perseids as there tend to be a lot. Pick an area of sky and just keep taking shots. 😊
This is a cropped image, K-5 with A series 24mm f2.8.
Perseid_001 by -Wargus-
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