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Old February 15th, 2007, 07:27 PM   #16
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Technical details

Hi Wayne,


Just a few questions - do you have more technical specs on the glass? Like, what type of glass (BK7, etc) from which catalog, what are the various radii of the two pieces of glass, is it airspaced or cemented, what's the clear diameter, etc? And am I correct in inferring that it's got a focal length of 125mm?

I'm making some lenses using off-the-shelf components and some optical design software, and I was hoping I could plug your achromat into the computer and see if it works. If it does, I'd take somewhere between 2 and 10.

And do you have limited supplies, or do you do periodic orders? Thanks,


Ryan
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Old February 16th, 2007, 01:52 AM   #17
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Yes. They didn't provide much information. I would like to know the shipping cost to Hong Kong. And how long does it takes to ship? Payment method etc...
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Old February 16th, 2007, 05:18 AM   #18
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Hi,

Please email me from the email address on the SGpro's website. The achromat has been custom designed and made for the SGpro and for this application, it is not a catalog/off the shelf item.
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Old February 16th, 2007, 10:16 AM   #19
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Wayne, might that be that it`s possible that the special SGpro achromat is not perfectly usable without the accompanying PCX lens to avoid vignetting from the incompatible frensel or PCX lenses? Just a thought.

T
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Old February 16th, 2007, 11:02 AM   #20
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Toenis. an achromat is to aid focusing of the camcorder only, and does not effect vignetting. Vignetting is solved by either:

1: A Condenser lens (PCX, fresnel, whatever) but this increases CA and distortions

2: Increase the GG's diffusion, but this looses more light

3: Increase distance between the GG and the camcorder, but this makes the adapter longer.
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Old February 18th, 2007, 10:44 AM   #21
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achromat question

Hi Wayne

Just want to say thanks for all the info you have posted, it's been very helpful

Can i use your achromat in front of a relay lens on my hd100? I am new to this stuff about 35mm adapters but from what i understand i have to have an achromat to allow me to focus on the GG and to prevent chromatic aberations.
Also can i step up and/or down to the achromat?

Thanks, Jez.
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Old February 22nd, 2007, 03:28 AM   #22
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Wayne,

What's the possibility to get the piece that holds the Achromat? If I'm not mistaken this is your 50-52mm glass in a 72mm Ring? Are you able to sell just the rings?

-Rh
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Old March 2nd, 2007, 03:14 PM   #23
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Rich,

unfortunately, the new aluminium rings are actually to house the newest achromat which is 57mm diameter, yours in 51mm diameter.

Jez, what relay system are you using?
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Old March 2nd, 2007, 05:03 PM   #24
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OK,

We now have a final date. The achromat with 72mm threaded black anodised aluminium ring will be ready on the 21st of this month. Price 99
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Old March 3rd, 2007, 03:02 AM   #25
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So it's not ready this week? Is that 21st a 100% guaranteed date?
I will need it before April.
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Old March 3rd, 2007, 04:18 AM   #26
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Hi,

Yes pretty much, the order is all in and the guys are very fast for turnaround.
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