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A wide-angle with starspikes?

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Post Options Post Options   Quote butangmucat Quote  Post ReplyReply Direct Link To This Post Topic: A wide-angle with starspikes?
    Posted: 12 October 2017 at 11:21
Hello,

I would like to have recommendations on a wide-angle lens that shows prominent starspikes. I do have a Pentax DA 15mm, but it is for crop sensor and I cannot control its aperture when adapted to my a7. I do have a full-frame capable Tamron Adaptall-2 SP 17mm f3.5 (151B), but haven't got a chance to try its starspikes. What other options do I have (preferably used A-mount ones, but I do have adapters for Pentax, Nikon, and Tamron Adaptall).

Sincerely
 



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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 11:47
You could just put lines over the front of the lens to generate spikes.

https://youtu.be/ipe3NN1yPzM
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stiuskr View Drop Down
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Post Options Post Options   Quote stiuskr Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 12:42
There's also filters that will create that effect.

https://www.cokin-filters.com/filter-systems/creative/filters/effects/
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Post Options Post Options   Quote momech Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 14:10
You can gut nice starbursts with pretty much any lens if you do it right. Basically you stop down - F126 should be good enough - and try to use a well defined light source - like a sharp street lamp, the sun just as it rises, etc.
Lenses with sharp angle aperture blades tend to produce better rays.
Newer, more expensive lenses have rounded aperture blades for smoother bokeh, and this tends to produce a somewhat less dramatic effect.
Also, the more aperture blades you have, the more rays you get.
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Matt View Drop Down
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Post Options Post Options   Quote Matt Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 15:19
Originally posted by momech momech wrote:

You can gut nice starbursts with pretty much any lens if you do it right. Basically you stop down - F126 should be good enough - and try to use a well defined light source - like a sharp street lamp, the sun just as it rises, etc.

That is more like an ultra-tiny-pinhole type of lens
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 17:09
For the best sunstars, look for lenses with an odd number of aperture blades that are not rounded. More suggestions here.
 



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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 18:05
Try your 17mm lens first.

My Minolta 17-35/3.5G is decent at this:

Sony A900 | Minolta 17-35/3.5G | 17mm | f/16 | 1/80s | 160iso

The (APS-C) Sony 10-18 is even better:

Sony A6000 | Sony 10-18/4 OSS | 10mm | f/20 | 1/80s | 100iso (I think...)
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Post Options Post Options   Quote Pirate Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 21:05
Originally posted by butangmucat butangmucat wrote:

Hello,

I would like to have recommendations on a wide-angle lens that shows prominent starspikes. I do have a Pentax DA 15mm, but it is for crop sensor and I cannot control its aperture when adapted to my a7. I do have a full-frame capable Tamron Adaptall-2 SP 17mm f3.5 (151B), but haven't got a chance to try its starspikes. What other options do I have (preferably used A-mount ones, but I do have adapters for Pentax, Nikon, and Tamron Adaptall).

Ahoy!

Would a Sigma AF 10-20/3.5 EX DC HSM be of interest? There's one listed in the Dyxum external sales thread here, though whether it's suitable for your purpose I have no idea.
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Post Options Post Options   Quote momech Quote  Post ReplyReply Direct Link To This Post Posted: 12 October 2017 at 21:29
Originally posted by Matt Matt wrote:

Originally posted by momech momech wrote:

You can gut nice starbursts with pretty much any lens if you do it right. Basically you stop down - F126 should be good enough - and try to use a well defined light source - like a sharp street lamp, the sun just as it rises, etc.

That is more like an ultra-tiny-pinhole type of lens


mmm- Yeah. Pretty small aperture there.
More like F16
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Post Options Post Options   Quote butangmucat Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2017 at 14:08
Originally posted by momech momech wrote:

You can gut nice starbursts with pretty much any lens if you do it right. Basically you stop down - F126 should be good enough - and try to use a well defined light source - like a sharp street lamp, the sun just as it rises, etc.
Lenses with sharp angle aperture blades tend to produce better rays.
Newer, more expensive lenses have rounded aperture blades for smoother bokeh, and this tends to produce a somewhat less dramatic effect.
Also, the more aperture blades you have, the more rays you get.


I do have the 24-105D and the (Tamron OEM) 28-75D, but I can't find any information on whether they have rounded aperture blades or not. I know that Minolta pioneered round aperture blades and that some of their better kit lenses actually have rounded blades (24-85 I think), so I would like to know where to look them up.

Sincerely

Edited by butangmucat - 13 October 2017 at 14:11
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2017 at 14:25
Originally posted by butangmucat butangmucat wrote:

Originally posted by momech momech wrote:

You can gut nice starbursts with pretty much any lens if you do it right. Basically you stop down - F126 should be good enough - and try to use a well defined light source - like a sharp street lamp, the sun just as it rises, etc.
Lenses with sharp angle aperture blades tend to produce better rays.
Newer, more expensive lenses have rounded aperture blades for smoother bokeh, and this tends to produce a somewhat less dramatic effect.
Also, the more aperture blades you have, the more rays you get.


I do have the 24-105D and the (Tamron OEM) 28-75D, but I can't find any information on whether they have rounded aperture blades or not. I know that Minolta pioneered round aperture blades and that some of their better kit lenses actually have rounded blades (24-85 I think), so I would like to know where to look them up.

The Minolta 24-85, 28-105, and 24-105 all have curved aperture blades that remain fairly round stopped down a bit. The pre-RS 24-85 and 28-105 aren't quite as smooth. I noticed they show a bit of a notch where the blades overlap.
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owenn01 View Drop Down
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Post Options Post Options   Quote owenn01 Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2017 at 15:21
Surely, there must be a plug-in filter for that? Seems there's a plug-in filter in PS for everything else....
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 13 October 2017 at 18:20
Originally posted by butangmucat butangmucat wrote:

I would like to have recommendations on a wide-angle lens that shows prominent starspikes. I do have a Pentax DA 15mm, but it is for crop sensor and I cannot control its aperture when adapted to my a7.

You want a lens for an A7, right?

I do have the 24-105D and the (Tamron OEM) 28-75D, but I can't find any information on whether they have rounded aperture blades or not.

For lenses that you own, you can look inside to see the blade shape.

I know that Minolta pioneered round aperture blades and that some of their better kit lenses actually have rounded blades (24-85 I think), so I would like to know where to look them up.

With an A7, you're not limited to Minolta lenses; the world is your oyster. A hint as you go exploring: The older the lens, the more likely it is to have straight-edged diaphragm blades.

Anyway, if it helps to know, my 1985 Minolta 24/2.8 has seven blades that are nearly straight-edged at f/22. Here's an example with that lens on a full frame camera:

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butangmucat View Drop Down
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Post Options Post Options   Quote butangmucat Quote  Post ReplyReply Direct Link To This Post Posted: 14 October 2017 at 01:54
Originally posted by sybersitizen sybersitizen wrote:

Originally posted by butangmucat butangmucat wrote:

I would like to have recommendations on a wide-angle lens that shows prominent starspikes. I do have a Pentax DA 15mm, but it is for crop sensor and I cannot control its aperture when adapted to my a7.

You want a lens for an A7, right?

I do have the 24-105D and the (Tamron OEM) 28-75D, but I can't find any information on whether they have rounded aperture blades or not.

For lenses that you own, you can look inside to see the blade shape.

I know that Minolta pioneered round aperture blades and that some of their better kit lenses actually have rounded blades (24-85 I think), so I would like to know where to look them up.

With an A7, you're not limited to Minolta lenses; the world is your oyster. A hint as you go exploring: The older the lens, the more likely it is to have straight-edged diaphragm blades.

Anyway, if it helps to know, my 1985 Minolta 24/2.8 has seven blades that are nearly straight-edged at f/22. Here's an example with that lens on a full frame camera:



So are you suggesting me to try my 1970s Pentacon 30mm f3.5 and my 1960s Pentax Super-Takumar 35mm f2?

Sincerely
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