cheap macro

cali92rs · 12-11-2013, 04:15 PM

Originally posted by Nass

Kurt, it'll work just fine if you want to get your feet wet at about 2.5:1 - see Coupled Reverse Lens

In the article, it mentions to stop down the secondary (reversed) lens. Is it best to leave the primary (the one attached to the camera) wide open?

kurt1968 · 12-12-2013, 02:31 AM

Originally posted by cali92rs

In the article, it mentions to stop down the secondary (reversed) lens. Is it best to leave the primary (the one attached to the camera) wide open?

i think you have to adjust the first one and see what gives you the sharpest image

**Canada_Rockies** · 12-12-2013, 09:52 AM

Originally posted by cali92rs

In the article, it mentions to stop down the secondary (reversed) lens. Is it best to leave the primary (the one attached to the camera) wide open?

That seems to be the prevailing advice. I think that once you get your rig set up, you simply try both ways and take whichever gives you the results YOU want.

Nass · 12-12-2013, 10:11 AM

That is of course true, Canada_Rockies, however you'll find that if you use the non-reversed lens aperture rather than the reversed one it will let through a lot of optical abberations because it's far away from the 'optical centre' of the combined lens. The centre of the combined lens is actually still for all intents and purposes physically the centre of the reversed lens - the non-reversed lens is just acting as a tube lens. You start getting quite nasty and strange image abberations when you move the aperture away from the optical centre.

**Canada_Rockies** · 12-12-2013, 10:47 AM

Thanks for the explanation, Nass.

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12-11-2013, 04:15 PM	#16
cali92rs Veteran Member Join Date: May 2011 Location: Long Beach, CA Posts: 3,354	Originally posted by Nass Kurt, it'll work just fine if you want to get your feet wet at about 2.5:1 - see Coupled Reverse Lens In the article, it mentions to stop down the secondary (reversed) lens. Is it best to leave the primary (the one attached to the camera) wide open?

12-12-2013, 02:31 AM	#17
kurt1968 Forum Member Join Date: Feb 2013 Posts: 57 Original Poster	Originally posted by cali92rs In the article, it mentions to stop down the secondary (reversed) lens. Is it best to leave the primary (the one attached to the camera) wide open? i think you have to adjust the first one and see what gives you the sharpest image

12-12-2013, 09:52 AM	#18
Canada_Rockies Loyal Site Supporter Join Date: Nov 2007 Location: Sparwood, BC, Canada Photos: Gallery \| Albums Posts: 12,385	Originally posted by cali92rs In the article, it mentions to stop down the secondary (reversed) lens. Is it best to leave the primary (the one attached to the camera) wide open? That seems to be the prevailing advice. I think that once you get your rig set up, you simply try both ways and take whichever gives you the results YOU want.

12-12-2013, 10:11 AM	#19
Nass Veteran Member Join Date: Aug 2009 Location: The British Isles Photos: Gallery Posts: 2,402	That is of course true, Canada_Rockies, however you'll find that if you use the non-reversed lens aperture rather than the reversed one it will let through a lot of optical abberations because it's far away from the 'optical centre' of the combined lens. The centre of the combined lens is actually still for all intents and purposes physically the centre of the reversed lens - the non-reversed lens is just acting as a tube lens. You start getting quite nasty and strange image abberations when you move the aperture away from the optical centre.

12-12-2013, 10:47 AM	#20
Canada_Rockies Loyal Site Supporter Join Date: Nov 2007 Location: Sparwood, BC, Canada Photos: Gallery \| Albums Posts: 12,385	Thanks for the explanation, Nass.