Hello,

We will soon be making the SGpro's r2 HD achromat available as a seperate item for £99 ($194). It is be in a black anodized 72mm threaded ring (male and female) and fully Anti reflection coated. It is the same achromat used in the SGpro r2 units, and has been tested with the HVX200 and HD100. Its strength is roughly +8 (little stronger the the CO +7)

Wayne rules!

Seriously, I`m just looking for 72mm HD achromat that would allow close focusing on ca 30x20mm frame with Canon XHA1 from the mod distance of 50-65mm.

Cheers,
T

Yep, i've aready sold a few of these (just the glass) to a few people making there DIYadapters, all have been happy.

Hi Wayne, please can you help me out here a little.
I have been playing around with the SGpro achromat but unfortunately I haven`t been able to focus Canon XH A1 properly on 35mm frame.
What am I doing wrong? Achromat`s distance from the gg is somewhere between 40-50mm would that be the reason? It`s positioned about 15mm in front of the camcorder lens.
I tend to believe that the distance between the achro and GG is too short.
Also which side should face the camcorder?

Thanks in Advance,
T

Hi,

Do you have a condenser in the path as well? If not and its just the achromat, then this might be just a little too short distance.

If you have a condenser lens about 4 - 6mm in front of the GG, you might be able to achieve focus then. Its a combination of all these variables.

I´m using frensel focusing screen. I`ll cut a custom holder for the achromat and experiment with the longer distance.

Thanks,
T

Hi,

Ok, the fresnel will not help focus wise then. Keep increasing distance until you find focus.

Also, test both orientations of the achromat to see what works best for you.

Wayne, might it be possible to use two of SGpro R2 achromats to shorten the overall length of the adaptor? Will two achromats result in more powerful achromat? Check your mail when you get the time, I`ve sent you an additional e-mail too.

Thanks,
T

Hi Wayne

Would this solve some of the edge to edge sharpness issues we had when testing the m2 and the brevis?

Phil

So when will it be available?(Approximate date?)

Hi,

OK guys, we have the sample 72mm threaded black aluminium ring all done, and its really nice! Im ordering a batch on monday, they should arrive in 3 weeks.

So that's the SGpro R2 achromat in a black aluminium 72mm threaded ring for £99

How will this compare to the redrock/ brevis one wayne?

Hi Phil,

Now there's a tough one to answer;) Your shootout results show the SGpro's images to be sharpest and although the M2 was not setup as well as it could be, I strongly believe this was down to the SGpro's achromat. I've had a little look at both the Redrock and brevis achromat's and they seem pretty much the same.

I will certainly be interested in getting one! is it your 58mm achromat with a 72mm thread?

Yes its the SGpro's Rev2 achromat that we used in the shootout (51mm dia) in a 72mm threaded ring.

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

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...

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.

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

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.

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.

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

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?

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

So it's not ready this week? Is that 21st a 100% guaranteed date?
I will need it before April.

Hi,

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