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SuperSirLink
Joined: 07 Oct 2017 Posts: 17
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Posted: Mon Aug 20, 2018 10:49 pm Post subject: Lens Turbo MFD |
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SuperSirLink wrote:
Does using a speed booster or lens turbo change your minimum focus distance and therefore the max magnification? |
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calvin83
Joined: 12 Apr 2009 Posts: 7547 Location: Hong Kong
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Posted: Tue Aug 21, 2018 1:36 pm Post subject: |
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calvin83 wrote:
minimum focus distance => same
max magnification => lowered _________________ https://lensfever.com/
https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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SuperSirLink
Joined: 07 Oct 2017 Posts: 17
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Posted: Tue Aug 21, 2018 3:11 pm Post subject: |
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SuperSirLink wrote:
Is the reduction in max magnification reduced by the same focal length reduction factor?
Trying to figure out how I would calculate max magnification of a lens when using the lens turbo. Then building on that, what it would be as I add extension tubes... |
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to-my
Joined: 06 Oct 2018 Posts: 4 Location: Poland
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Posted: Mon Oct 08, 2018 3:46 pm Post subject: Re: Lens Turbo MFD |
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to-my wrote:
SuperSirLink wrote: |
Does using a speed booster or lens turbo change your minimum focus distance and therefore the max magnification? |
Have mitakon lens turbo II eos.
In my opinion, yes, lens turbo can change minimum focus distance, also bokeh.
It all depends on the lens you are using.
I don't have a example for it, but I see it in every day usage. |
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aidaho
Joined: 29 Apr 2018 Posts: 456 Location: Ukraine
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Posted: Mon Oct 08, 2018 7:27 pm Post subject: |
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aidaho wrote:
MFD is unchanged.
Can't speak for changes in bokeh, since I do not own full-frame for direct comparison. |
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to-my
Joined: 06 Oct 2018 Posts: 4 Location: Poland
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Posted: Mon Oct 08, 2018 7:53 pm Post subject: |
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to-my wrote:
aidaho wrote: |
MFD is unchanged.
Can't speak for changes in bokeh, since I do not own full-frame for direct comparison. |
Comparison can be done just for LT and without LT. Same size of sensor.
Full frame - it is another story (in my opinion).
Anyway, I'll try to compare on dx |
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DConvert
Joined: 12 Jun 2010 Posts: 901 Location: Essex UK
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Posted: Mon Oct 08, 2018 9:44 pm Post subject: |
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DConvert wrote:
Like a normal teleconverter a focal reducer should not change MFD, but it will change DOF making objects that were just OOF sharper & making them look focused. Adapters that screw on the front of the lens often will change MFD.
Bokeh will be altered in size by the factor of the reducer, and no doubt (subtly?) altered in other characteristics as well. |
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