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Old Jun 28, 2006, 5:31 PM   #1
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FROM: http://www.microscopy-uk.org.uk/mag/...5/bjmacro.html


About the mid of the page you'll find a mega stacking of 5 diopters:
Nikon 5T (+1,5), two Nikon 6T (+2,9) , a CANON 250D( +4) and a Sony VCL M3358 (+3,3). Total +14,6 diopter (I must see if there are some images)

He says Image degradation is not very noticeable as compared to using only 1 or 2 diopters.

I think Ill order another 6T to stack with 5T and 6T for a total of +7,3...


Photos
http://www.microscopy-uk.org.uk/mag/indexmag.html
(and in other index pages)

Microsc. Photos
http://www.microscopy-uk.org.uk/micropolitan/index.html


Narmer

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Old Jun 28, 2006, 6:23 PM   #2
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Dear Francesco,

I have stacked 3 Elpro lenses and there was a visible degradation!!
Even the results with two ELPRO VIB - the previous version of the ELPRO 2 were not good enough!
Try to get the a-life size, it is the best glass in this category - better than the Elpros with our long zooms. It is the only non vignetting lens with +8 diopters.
I waited several months until I got one at fleabay.
I would like to have the zoerk (+12 diopters), but this lens alone costs more than my camera.
By the way, my best lens is still the MBS-10 - used by cerambyx, focal length 90mm (190mm, 45mm)But this is too heavy to be carried around for me.
Many spyglasses / binoculars have achromatic frontlenses aroung +7 diopters. I have seen very good results with these lenses! I will test one soon....
The sony achromat is quite interesting. Seems to be quite cheap and good glass. It is on my recommended lenses list. As nikon leaves the market, this could be a good substitute.

Sven




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Old Jun 29, 2006, 6:08 PM   #3
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This will surely result in significant degradation. Five lens? No way! I would go with the dcr150 and 250 for +12 diopter.

The Sony VCL M3358 looks like a nice mid-priced (~$50) +3 diopter achromat. Is it only available with 58mm threads?
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Old Jun 30, 2006, 2:27 AM   #4
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fmoore wrote:
Quote:
This will surely result in significant degradation. Five lens? No way! I would go with the dcr150 and 250 for +12 diopter.

The Sony VCL M3358 looks like a nice mid-priced (~$50) +3 diopter achromat. Is it only available with 58mm threads?
I have only seen this 58mm version of the sony lens. There are good critiques on this lens, I have seen excellent pictures and this lens is available!!

Stacking the dcrs needs a 49 -> 43 stepdown ring (or a stepupring so that the next snap adapter can take over). Butthere areonly small differences between +8 and +12 lenses. The alife size has only 20% more coveragethan a +12 diopterlens. So I don`t need these lenses. My next step is +20 (50mm reversed).

I try to stay uptodate with my chart of achromats. Any help to reduce the number of questionmarks appreciated! Especially the inner diameter of the lens at the back wound help to predict vignetting!

http://www.geocities.com/seemolf/ach...l?200630#chart

Sven


...oneinformation for you:Franscesco

I read in a german forum that the dcr250 starts vignetting at:

x7 zoom with the FZ20 and

X3 zoom with the FZ30






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Old Jun 30, 2006, 12:15 PM   #5
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Thanks Sven

I am seeing if they can send me another 6T (€ 54 withouth shipping costs and IVA: all included it costs me 86€ from a shop in Italy, where thay are checking to find one from their retailers).
So I'll be using the two 6T stacked for more closeup and the 5T alone for butterflies, Dragonflies and other large (and more fearful) insects, which are harder t oapproach.
Then I ll also stack them all to see if there is some degradation:
I have never made experiments to determine the degradation of optical qty of 6T vs 6T + 5T. But the latter combo does not seem to producedeterioration in the pics.

FR

PS for some more achromats
http://www.angelfire.com/ca/erker/closeups.html


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Old Jun 30, 2006, 4:05 PM   #6
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thanks Francesco,

I used this chart as a basis for my own chart - some date were missing....

This is an excellent link too:
http://home.planet.nl/%7Eheuv0283/achromats.html

The author is a member of the dpreview forum.

...but we need much more data!
I am missing data about stacking lenses, just to warn ...................

Sven

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