Forums: Skydiving Disciplines: Photography and Video:
linking two WA century .55 and .5 ???

 


minicos

Dec 22, 2009, 3:00 AM
Post #1 of 12 (1607 views)
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linking two WA century .55 and .5 ??? Can't Post

Hello,
I've got a century .55x and the outside thread is 43mm so exactly the same the inside one of the new .5 HD

Do you think (DSE ?) that it's relevant to link both together ?
I think the resolution of those 2 WA will be better than any .2 flat on the market, but will it still focus ?

Who as got both and can make the trial ?


antonija

Dec 22, 2009, 5:19 AM
Post #2 of 12 (1557 views)
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Re: [minicos] linking two WA century .55 and .5 ??? [In reply to] Can't Post

Generally speaking you want as less as possible extra glass in front of your primary lens (the one that limits the resolution). Every single thing you put in front will degrade image a bit (although with high quality wide angle lens no one can spot the difference, but it's there), so stacking them up there might not be the best idea.

But as always: If you already have both put them on and look at the footage. If you (and whoever you're filming for) can't spot the difference then you're good to go :)


minicos

Dec 22, 2009, 6:04 AM
Post #3 of 12 (1542 views)
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Re: [antonija] linking two WA century .55 and .5 ??? [In reply to] Can't Post

I've not both, that's why i'm asking.

Some WA are made of large groups of lenses, that doesn't mean they are bad.

resolution of .55x : 500 ? 600 lines ?
resolution of .5x : 900 lines ?

So what about both linked versus any flat wide angle that is about 250 lines of resolution ?

I'm not even sure it will be worst than a .3 baby death...


(This post was edited by minicos on Dec 22, 2009, 7:40 AM)


raceface  (C License)

Dec 22, 2009, 7:09 AM
Post #4 of 12 (1525 views)
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Re: [minicos] linking two WA century .55 and .5 ??? [In reply to] Can't Post

at least the idea of stacking wideangle lens seems be possible
http://www.schneideroptics.com/...ID=1085&IID=1362


minicos

Dec 22, 2009, 7:46 AM
Post #5 of 12 (1509 views)
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Re: [raceface] linking two WA century .55 and .5 ??? [In reply to] Can't Post

well done for the link !
So it might be possible, but i'm pretty sure the quality of lenses shown is better than the one I want to match (at least for the .55).

The idea is to get one lens for general purpose and one for inside jumps by adding a complement without dealing too much with quality. If the quality matches a baby death .3 then it'll be a still compact solution for a price in pair with a Royal .2


Premier DSE  (D 29060)

Dec 22, 2009, 9:08 AM
Post #6 of 12 (1487 views)
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Re: [minicos] linking two WA century .55 and .5 ??? [In reply to] Can't Post

you don't get GREATER lines of resolution when stacking lenses, you get lesser resolution when stacking lenses.
The lowest resolution determines the best of the end result.
I have both, but don't have both with me (on Xmas holiday). I'll screw em' together.
How well it works will be camera dependent.
What's the end game?


minicos

Dec 22, 2009, 11:02 AM
Post #7 of 12 (1465 views)
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Re: [DSE] linking two WA century .55 and .5 ??? [In reply to] Can't Post

I know that, I suppose that if you put two bezels together the result won't be bad. In this case, the .55 will be the worst and I assume some light/contrast can be lost too but... imagine if it's good or even fair ?

500 lines for the couple still gives a marvelous result for a real GA <.3 at this price.


Premier DSE  (D 29060)

Dec 22, 2009, 11:48 AM
Post #8 of 12 (1450 views)
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Re: [minicos] linking two WA century .55 and .5 ??? [In reply to] Can't Post

you're assuming the focal points will perfectly line up (they may well not) and that would immediately impair the resolution, and you could easily be less than an SD-designed lens.
When I get back to the DZ I'll shoot a lens chart with them stacked, and that'll put an end to speculation. I'm curious myself.


minicos

Dec 22, 2009, 11:53 AM
Post #9 of 12 (1449 views)
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Re: [DSE] linking two WA century .55 and .5 ??? [In reply to] Can't Post

Nice Thank you Wink
It's a guess, who knows ?
you will know and tell


minicos

Jan 25, 2010, 8:32 AM
Post #10 of 12 (1262 views)
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Re: [minicos] linking two WA century .55 and .5 ??? [In reply to] Can't Post

up before the subject goes in the forum deepness Wink


Premier DSE  (D 29060)

Jan 25, 2010, 7:06 PM
Post #11 of 12 (1223 views)
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Re: [minicos] linking two WA century .55 and .5 ??? [In reply to] Can't Post

No lens chart available, but as expected, it looks pretty bad with cheapo lenses.
Lens Comparisons-Century .55 and .5 mounted together

Decide for yourself if it works for you. The loss in resolution can't be measured in these images, but it's fairly apparent anyway.
Note in the combined lenses there is also a lot of refraction.
Some might like the look, but the vignetting, added distortion, and refraction make it a no-go for me except in some very weird circumstances.


raceface  (C License)

Sep 30, 2012, 10:30 AM
Post #12 of 12 (856 views)
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Re: [minicos] linking two WA century .55 and .5 ??? [In reply to] Can't Post

Century 0,55x + Raynox 0,3x,
result is something similar to Opteka 0,3x
(jpg compression changed bcs 300KB limit)
Attachments: 0_NoLens_1920x1080.jpg (214 KB)
  1_Century055_0.55x_1920x1080.JPG (275 KB)
  2_Raynox3062_0.3x_1920x1080.JPG (265 KB)
  3_Raynox3062_0.3x+Century055_0.5x_1920x1080.jpg (229 KB)
  4_OptekaBabyDeath_0.3x_1920x1080.jpg (221 KB)
  5_Lens+CX106.jpg (104 KB)



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