Any good 300mm tube lens recomendations?

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seta666
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Re: Any good 300mm tube lens recomendations?

Post by seta666 »

dolmadis wrote:
Mon Sep 06, 2021 10:00 am
I was looking around using the Lens Finder on Surplus Shed and this came up in a search for something else. 285mm though.
Sorry, I missed this one. Seems a bit narrow to, I am not sure if that would cover FF but at that price point may be worth trying.

The Raynox seems like a solid option.

I am going to be away for a couple of months, so it will have to wait

Lou Jost
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Re: Any good 300mm tube lens recomendations?

Post by Lou Jost »

Tests for chromatic aberration, center sharpness, edge sharpness, and vignetting on more than 30 configurations led us to select a macro lens (Raynox DCR-5320PRO) to use as a tube lens.
I think they did not test many medium format lenses as tube lenses.

PhotogrAzure
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Re: Any good 300mm tube lens recomendations?

Post by PhotogrAzure »

JKT wrote:
Wed Sep 08, 2021 11:18 am
I don't know if this helps at all, but...

Mitutoyo 10x & DCR-5320 Pro (+3)
Image

Mitutoyo 10x & Canon EF 300mm f/4 L IS USM
Image

Full size images with Canon EOS RP.
Did you manage to estimate the focal length of 5320Pro when use A and B part standalone?
It look like the +3 part is about 330mm?

JKT
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Re: Any good 300mm tube lens recomendations?

Post by JKT »

PhotogrAzure wrote:
Wed Jan 05, 2022 9:55 pm
Did you manage to estimate the focal length of 5320Pro when use A and B part standalone?
It look like the +3 part is about 330mm?
I have just one measurement for +3 and that gave 343.4 mm. It was against Mitutoyo 10x, which has several measurements so the result should be reasonably accurate. The +2 I have not tried alone. Combination +5 in normal configuration has also one measurement giving 201.9 mm. The odd part is that adding a pair of stepping rings between the two changes the result to 203.4 mm. Is there a theoretical explanation to that or does that indicate measuring error? There is also some uncertainty in the correct sensor distance and that definitely affects the results.

Edit: Now that I have the FDn 500mm a comparison to the +2 could be interesting. If I can just find enough tubes...

lothman
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Re: Any good 300mm tube lens recomendations?

Post by lothman »

just a question:
isn't a 200mm tube lens the same than a +5 closeup lens? so a 300mm lens would be a +3,3 lens.

If so I could provide the Leica Elpro VIa and VIb closeup lenses which are in this range, they have 44mm thread.
Leica_Elpro_s.jpg
Last edited by lothman on Thu Jan 06, 2022 9:19 am, edited 1 time in total.

JKT
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Re: Any good 300mm tube lens recomendations?

Post by JKT »

lothman wrote:
Thu Jan 06, 2022 4:43 am
just a question:
isn't a 200mm tube lens the same than a +5 closeup lens? so a 300mm lens would be a +3,3 lens.
Yes and yes.

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