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February 15th, 2007, 07:27 PM | #16 |
Regular Crew
Join Date: Dec 2005
Posts: 46
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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 |
February 16th, 2007, 01:52 AM | #17 |
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Join Date: Nov 2006
Location: Hong Kong
Posts: 81
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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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February 16th, 2007, 05:18 AM | #18 |
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Join Date: Jun 2005
Location: Brighton, East Sussex, UK
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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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Thanks, Wayne. |
February 16th, 2007, 10:16 AM | #19 |
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Join Date: Nov 2005
Location: Tartu, Estonia
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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 |
February 16th, 2007, 11:02 AM | #20 |
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Join Date: Jun 2005
Location: Brighton, East Sussex, UK
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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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February 18th, 2007, 10:44 AM | #21 |
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Join Date: Feb 2007
Location: London
Posts: 1
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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. |
March 2nd, 2007, 03:14 PM | #23 |
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Join Date: Jun 2005
Location: Brighton, East Sussex, UK
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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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March 2nd, 2007, 05:03 PM | #24 |
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Join Date: Jun 2005
Location: Brighton, East Sussex, UK
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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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March 3rd, 2007, 03:02 AM | #25 |
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Join Date: Nov 2006
Location: Hong Kong
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So it's not ready this week? Is that 21st a 100% guaranteed date?
I will need it before April. |
March 3rd, 2007, 04:18 AM | #26 |
Major Player
Join Date: Jun 2005
Location: Brighton, East Sussex, UK
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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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