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Lomo 3,7 x .11 beginner set up question

 
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altereddecay



Joined: 22 May 2020
Posts: 2
Location: OAKLAND CA

PostPosted: Sat May 23, 2020 6:13 pm    Post subject: Lomo 3,7 x .11 beginner set up question Reply with quote

Greetings,
Im new here and have been shooting some simple stacks with my Nikon D800 and 105mm lens using Helicon Focus. I love it and wanted to expand and recently purchased at Lomo 3,7 x 11 Objective and have a WeMacro but I have questions. Based off of my readings from the forums I do not think I need a tube lens but rather 160mm of extension? I currently have the following pieces to attach the Lomo directly to my D800... Not sure if this would work...
F-mount to 52mm
52mm Female-Female adapter
52mm to RMF
Lomo 3,7 x 11 Objective

If I need the 160mm extension I'm looking at ThorLabs:
SM2 Lens Tube, 3" Thread Depth
SM2 Lens Tube, 2" Thread Depth
Ø2" Adjustable Lens Tube, 1.31" Travel
Slip Ring for SM2 Lens Tubes

This would get me to the 160mm extension based off of the info at
https://www.closeuphotography.com/lomo-3-7x-objective
and https://www.closeuphotography.com/52mm-setup

Is this correct ?
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Pau
Site Admin


Joined: 20 Jan 2010
Posts: 5023
Location: Valencia, Spain

PostPosted: Sun May 24, 2020 1:47 am    Post subject: Reply with quote

The 160mm tube length specification refers to the distance between the objective shoulder and the end of the microscope tube; in most cases the primary image is formed 10mm bellow it, so the right optical distance from the objective shoulder to the sensor would be 150mm.*
That said these low magnification objectives are very tolerant to changes in TL, you can play with it quite a bit and you will have changes in magnification (and focus point)

Despite corrected for a finite tube length some people (mainly Robert O'Toole) have experimentally found that the use of an intermediate converging lens ("tube lens" by similarity of microscope naming) can improve it, take a look at:
https://www.closeuphotography.com/lomo-3-7x-and-sr120

* Robert says 155mm, maybe LOMO is a bit different although this doesn't matter much here
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Pau
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altereddecay



Joined: 22 May 2020
Posts: 2
Location: OAKLAND CA

PostPosted: Sun May 24, 2020 9:44 am    Post subject: Reply with quote

Pau, Thank you for the response. Measuring my Nikon 105mm it is exactly 150mm from season to the RMF adapter so I think I'll give it a try and see what I get before ordering the extension tubes.
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