Jump to content


Photo
- - - - -

FIT Pro external dioptres


  • Please log in to reply
24 replies to this topic

#1 Alex_Mustard

Alex_Mustard

    The Doctor

  • Super Mod
  • 8373 posts
  • Gender:Male
  • Location:La Maddalena

Posted 16 January 2011 - 04:24 AM

I took these test shots yesterday with the FITpro external dioptres. They are dual element, underwater close-up lenses that come in +5 and +8 powers. Although they are at the cheaper end of the scale, I have been impressed with their sharpness, but more so with their lack of fringing and other optical aberrations that can effect corners in this sort of setup.

These shots are all with Nikon D7000 and 105mm VR and 1.4x teleconverter (all on minimum focus, all uncropped). So they are already at high magnification before the addition of the dioptres (dioptre used noted on image). They are close up details on the small polyps of star coral (each polyp is approximately 1-3mm across).

But I thought I'd share these tests - as I actually managed the photograph the same polyps with each setup!

fit_dioptres.jpg

If you want a general purpose close-up lens then I'd favour the +5. Whereas if you want something for super-macro to use in conjunction with a macro lens and teleconverter then I'd go for the +8.

They do work stacked together - but Depth of Field is razor thin and only suited to certain subjects.

Alex

p.s. There are many, many external dioptres on the market. I was lent these for my trip - and had not seen any test shots from them before - so thought was worth sharing.

Alexander Mustard - www.amustard.com - www.magic-filters.com
Nikon D4 (Subal housing). Olympus EPL-5 (waiting for housing).


#2 Aussiebyron

Aussiebyron

    Tiger Shark

  • Member
  • PipPipPipPip
  • 595 posts

Posted 16 January 2011 - 04:45 AM

Alex Do you have a link where you can purchase these dioptres?

Regards Mark
Nikon D7000 with Aquatica housing called "Deedee", Tokina 10-17,Nikkor 60mm, Nikkor 105mm, Sigma 17-70, Ikelite DS161

http://www.flickr.co...s/22898788@N04/

#3 Alex_Mustard

Alex_Mustard

    The Doctor

  • Super Mod
  • 8373 posts
  • Gender:Male
  • Location:La Maddalena

Posted 16 January 2011 - 10:44 AM

Alex Do you have a link where you can purchase these dioptres?


Yep, here.

Alex

Alexander Mustard - www.amustard.com - www.magic-filters.com
Nikon D4 (Subal housing). Olympus EPL-5 (waiting for housing).


#4 derway

derway

    Great White

  • Member
  • PipPipPipPip
  • 1136 posts
  • Location:Pasadena CA

Posted 16 January 2011 - 03:28 PM

Very cool Alex! But the link is broken.

What kind of mounting do they use?
Don Erway
http://picasaweb.google.com/onederway/
http://www.pbase.com/derway

nikon n90s/ikelite housing/twin SS-200 canon G2/ikelite/DS-50/optical TTL slave
sony V3/ikelite/DS-51/Heinrich DA2 slave

#5 ckchong

ckchong

    Sting Ray

  • Member
  • PipPipPip
  • 206 posts
  • Gender:Male
  • Location:Malaysia

Posted 16 January 2011 - 05:42 PM

I get from here
http://www.fun-in.co...hp?cPath=33_219

It is using 67mm screw in.......

#6 Otara

Otara

    Sting Ray

  • Member
  • PipPipPip
  • 260 posts

Posted 17 January 2011 - 12:25 AM

Ooo meow on the lmgtfy!

Otara

#7 howeikwok

howeikwok

    Wolf Eel

  • Member
  • PipPip
  • 176 posts
  • Gender:Male
  • Location:Singapore

Posted 17 January 2011 - 05:21 AM

I've been using the FIT +5 Diopters for about a year now. No complaints about the IQ and like what the good Dr says, pretty good sharpness and little fringing compared to the Inon and UN diopters i've tried before. I have used it with my Canon 50D and 100mm macro lens and triple-stacked the +5 diopters. Now i'm waiting on the subsee +10 to see the difference. Sample of a shot taken with the above mentioned set-up, no cropping. Not sure if it was at minimum focal distance though. At minimum I think i can probably do a full frame or even a half body portrait of a pygmy if it's adult sized.

Posted Image

Edited by howeikwok, 17 January 2011 - 05:22 AM.

Canon 50D/60mm macro/100mm macro/Tokina 10-17mm FE/Nexus Housing/Inon Z-240s

#8 Alex_Mustard

Alex_Mustard

    The Doctor

  • Super Mod
  • 8373 posts
  • Gender:Male
  • Location:La Maddalena

Posted 24 January 2011 - 04:31 AM

I have shot these a lot more now and I'm very impressed with the image quality. This rough head blenny is taken with the +5 and +8 dioptres stacked together and in front of a 105mm VR and 1.4x teleconverter - on minimum focus (for those who have not dived the Caribbean, like pygmy seahorses, rough heads are much smaller than people expect).

Whole frame:
CAY11_am_13414a.jpg

100% crop (straight export from lightroom - not sharpened):
CAY11_am_13414.jpg

This is really impressive detail and very well controlled fringing (no CA or other corrections applied in RAW conversion), considering it is with stacked dioptres.

Alex

Alexander Mustard - www.amustard.com - www.magic-filters.com
Nikon D4 (Subal housing). Olympus EPL-5 (waiting for housing).


#9 loftus

loftus

    Blue Whale

  • Member
  • PipPipPipPipPipPip
  • 4571 posts
  • Gender:Male
  • Location:Winter Park, Fl

Posted 24 January 2011 - 04:47 AM

Alex, are these D7000 or D700?

Edited by loftus, 24 January 2011 - 04:48 AM.

Nikon D800, Nikon D7000, Nauticam, Inons, Subtronic Novas. Lens collection - 10-17, 15, 16, 16-35, 14-24, 24-70, 85, 18-200, 28-300, 70-200, 60 and 105, TC's. Macs with Aperture and Photoshop.

#10 Alex_Tattersall

Alex_Tattersall

    Great Hammerhead

  • Industry
  • PipPipPipPip
  • 867 posts
  • Gender:Male
  • Location:UK

Posted 24 January 2011 - 08:12 AM

Very good detail Alex. What a fantastic little fish!
www.flickr.com/photos/alextattersall

www.nauticamuk.com
www.uwvisions.com
Exclusive official importer of Nauticam products into the UK and Ireland

#11 Alex_Mustard

Alex_Mustard

    The Doctor

  • Super Mod
  • 8373 posts
  • Gender:Male
  • Location:La Maddalena

Posted 24 January 2011 - 09:27 AM

Alex, are these D7000 or D700?


These are D7000 - can't see any point in doing super macro with a D700 (when you have a D7000 in a housing)! The ones at the top are D7000 too. I have lots more - just too busy (with the workshop) to post at the moment.

Alex

Alexander Mustard - www.amustard.com - www.magic-filters.com
Nikon D4 (Subal housing). Olympus EPL-5 (waiting for housing).


#12 Alex_Mustard

Alex_Mustard

    The Doctor

  • Super Mod
  • 8373 posts
  • Gender:Male
  • Location:La Maddalena

Posted 25 January 2011 - 03:55 AM

We went out again yesterday afternoon to photograph the golden blennies on the workshop - and many people were really shocked by how small they were - so I shot a sequence again - as this gives a better idea of the performance of the external lenses and performance we're discussing.

A - my fingernail taken at minimum focus with Nikon D7000 + 1.7x TC + 105mm VR (no external dioptres).
B - blenny taken at minimum focus with Nikon D7000 + 1.7x TC + 105mm VR (no external dioptres).
C - blenny taken at minimum focus with Nikon D7000 + 1.7x TC + 105mm VR and FIT + 5 diopter.
D - blenny taken at minimum focus with Nikon D7000 + 1.7x TC + 105mm VR and stacked +5 and +8 diopters.

All images are uncropped:

CAY11_am_14552.jpg

Alex

Alexander Mustard - www.amustard.com - www.magic-filters.com
Nikon D4 (Subal housing). Olympus EPL-5 (waiting for housing).


#13 buceo

buceo

    Moray Eel

  • Member
  • PipPip
  • 75 posts
  • Gender:Male
  • Location:Réunion island

Posted 27 January 2011 - 08:34 AM

Very great pictures and test
What is the distance to the blenny to take this pictures ?

#14 Alex_Tattersall

Alex_Tattersall

    Great Hammerhead

  • Industry
  • PipPipPipPip
  • 867 posts
  • Gender:Male
  • Location:UK

Posted 27 January 2011 - 09:04 AM

For info, there are plans to produce a +16 diopter in the near future.
www.flickr.com/photos/alextattersall

www.nauticamuk.com
www.uwvisions.com
Exclusive official importer of Nauticam products into the UK and Ireland

#15 Timmoranuk

Timmoranuk

    Great White

  • Member
  • PipPipPipPip
  • 1168 posts
  • Gender:Male
  • Location:Near NDAC, South Wales
  • Interests:Technical diving; open circuit and rebreather, U/W photography, topside photography, travel, aviation and sailing.

Posted 27 January 2011 - 01:24 PM

I'm wondering how the stregths of the INON UCL-165 and 330 compare with the FIT diopters. Can anyone advise the equivalents?
· Canon 5D3, 7D & Nauticam housings. Sigma 15mm, Canon 16-35mm, Tokina 10-17mm, Sigma 8-16mm, Canon 10-22mm, Sigma 17-70mm, Sigma 70-200mm, Sigma 120-300mm, Canon 60mm & 100mm
· INON Z-240s & Sea & Sea YS-250 Pros
· SmallHD DP4 monitor & NA-DP4. Fisheye Aquavolt 3500s & 7000s
· Zen DP-100, DP-200 & DP-230

#16 SlipperyDick

SlipperyDick

    Wolf Eel

  • Industry
  • PipPip
  • 137 posts
  • Gender:Male
  • Location:Mississauga, Ontario, Canada
  • Interests:Scuba/Free Diving, Mechanical Engineering, Skateboarding, Snowboarding, Exercising, Partying, Sleeping...

Posted 27 January 2011 - 06:02 PM

It is important that underwater shooters understand that the strength of a given lens is not absolute. Let me explain:

The dioptric strength of a lens (+5, +8, +16, etc.) is relative to the medium that the lens' refractive surfaces contact (air, water, jello, etc.). So, while these FIT lenses have strengths of +5 and +8 in air, they appear to be water-contact lenses (correct me if I'm wrong!). If so, they are not +5 and +8 underwater, because typical glass achromats lose around 60-70% of their power underwater.

Timmoranuk - By direct measurement from the photos that Alex has provided, the magnification ratio achieved by the +5/+8 combo relative to the shot with no diopters is about 1.5:1. That's what you would expect from an underwater +5 diopter lens. This is consistent with the loss of strength due to water contact mentioned above. If this is true, then the FIT +8 is an underwater +3 (same power as the Inon UCL-330), and the FIT +5 is an underwater +2. A similarly constructed +16 would be an underwater +6 diopter lens (same power as the Inon UCL-165).

The MacroMate and SubSee are examples of sealed optics which retain their power both above and below water, since the lenses are always in contact with air.

All of this being said, Alex's results speak for themselves - they seem to produce sharp images free of chromatic aberration.

Just my two cents!


Keri
Keri Wilk
ReefNet Inc.
www.reefnet.ca

#17 Alex_Mustard

Alex_Mustard

    The Doctor

  • Super Mod
  • 8373 posts
  • Gender:Male
  • Location:La Maddalena

Posted 27 January 2011 - 06:56 PM

Thanks for the explanation, Keri. Very helpful.

For those interested in the techniques and kit options you should read Keri's article on DPG.

Alex

Alexander Mustard - www.amustard.com - www.magic-filters.com
Nikon D4 (Subal housing). Olympus EPL-5 (waiting for housing).


#18 howeikwok

howeikwok

    Wolf Eel

  • Member
  • PipPip
  • 176 posts
  • Gender:Male
  • Location:Singapore

Posted 27 January 2011 - 08:24 PM

It is important that underwater shooters understand that the strength of a given lens is not absolute. Let me explain:

The dioptric strength of a lens (+5, +8, +16, etc.) is relative to the medium that the lens' refractive surfaces contact (air, water, jello, etc.). So, while these FIT lenses have strengths of +5 and +8 in air, they appear to be water-contact lenses (correct me if I'm wrong!). If so, they are not +5 and +8 underwater, because typical glass achromats lose around 60-70% of their power underwater.

Timmoranuk - By direct measurement from the photos that Alex has provided, the magnification ratio achieved by the +5/+8 combo relative to the shot with no diopters is about 1.5:1. That's what you would expect from an underwater +5 diopter lens. This is consistent with the loss of strength due to water contact mentioned above. If this is true, then the FIT +8 is an underwater +3 (same power as the Inon UCL-330), and the FIT +5 is an underwater +2. A similarly constructed +16 would be an underwater +6 diopter lens (same power as the Inon UCL-165).

The MacroMate and SubSee are examples of sealed optics which retain their power both above and below water, since the lenses are always in contact with air.

All of this being said, Alex's results speak for themselves - they seem to produce sharp images free of chromatic aberration.

Just my two cents!


Keri


Hi Keri,

could you clarify what it means by sealed optics? from my understanding it's the lens elements sealed in air? Aren't the FIT and Inon diopters dual element lens that are also sealed?

Many thanks for any clarification.

Alvin
Canon 50D/60mm macro/100mm macro/Tokina 10-17mm FE/Nexus Housing/Inon Z-240s

#19 pdemaagt

pdemaagt

    Sting Ray

  • Member
  • PipPipPip
  • 219 posts
  • Gender:Male
  • Location:Katwijk

Posted 28 January 2011 - 12:13 AM

I have shot these a lot more now and I'm very impressed with the image quality. This rough head blenny is taken with the +5 and +8 dioptres stacked together and in front of a 105mm VR and 1.4x teleconverter - on minimum focus (for those who have not dived the Caribbean, like pygmy seahorses, rough heads are much smaller than people expect).

Whole frame:
CAY11_am_13414a.jpg

100% crop (straight export from lightroom - not sharpened):
CAY11_am_13414.jpg

This is really impressive detail and very well controlled fringing (no CA or other corrections applied in RAW conversion), considering it is with stacked dioptres.

Alex


Great shot Alex!!

#20 SlipperyDick

SlipperyDick

    Wolf Eel

  • Industry
  • PipPip
  • 137 posts
  • Gender:Male
  • Location:Mississauga, Ontario, Canada
  • Interests:Scuba/Free Diving, Mechanical Engineering, Skateboarding, Snowboarding, Exercising, Partying, Sleeping...

Posted 29 January 2011 - 11:31 AM

No problem, Alex - thanks for giving that article a shout-out :island:

could you clarify what it means by sealed optics? from my understanding it's the lens elements sealed in air? Aren't the FIT and Inon diopters dual element lens that are also sealed?


When I say "sealed optics", I mean that the lens' refractive (curved) surfaces are permanently sealed in air, so they never come in contact with water. This is how the MacroMate and SubSee are constructed - underwater, they perform exactly as they do on land. I'm not sure about the MacroMate, but the +10 diopter SubSee is actually a 4-element lens system.

The FIT lenses are most likely dual-element achromats, but are not sealed optics (again, someone correct me if I'm wrong!). Water directly contacts their refractive lens surfaces, so they lose most of their power underwater.

The Inon lenses are a combination of sealed optics and water-contact optics. They have 2 curved internal surfaces which are permanently sealed in air, but their external surfaces are also curved... so, a much smaller portion of their power is lost (the Inon UCL-165 goes from a +7.4 on land to a +6 underwater). However, they are not achromats (so are prone to chromatic aberration), and have much more edge distortion than others.

I hope that cleared things up for you, Alvin!

Keri
Keri Wilk
ReefNet Inc.
www.reefnet.ca