achromat war at DVinfo.net

Biel Bestue · June 1st, 2008, 01:56 PM

how does sgpro achromat compete against brevis's?

i've been a user of brevis and i've seen some CA aberration when using their achromat? is there anything better for brevis?

Dennis Wood · June 16th, 2008, 09:45 PM

Yes, our optical flip array! The flip system transforms cameras like the XH-A1 into incredibly clean cameras and is certainly well regarded by our customers in terms of edge to edge sharpness too :-) Our video university series has a segment showing a test of the flipped Brevis with respect to CA...definitely some interesting results there.

Biel Bestue · June 17th, 2008, 05:58 PM

Dennis i was thinking on getting a more bigger achromat (actually i don't know if they exist, i've havn't searched yet) since the midle is sharp, maybe i can have a bigger one and only use the middle, and then put a stepdown to 72 and use the cinevate spacer, do you think this can be achived that way?

Gints Klimanis · June 19th, 2008, 07:39 PM

Would the Canon 77mm 500D or 250D work? I actually have a 500D sitting in my drawer and will try it the next time I use my RedRock M2, but given that it has a fixed focal distance of 500mm (50cm or about 20") , it will need too much distance from the ground glass. The 250D may work with the rails provided.

June 1st, 2008, 01:56 PM	#1
Biel Bestue Regular Crew Join Date: Jul 2005 Posts: 96	achromat war how does sgpro achromat compete against brevis's? i've been a user of brevis and i've seen some CA aberration when using their achromat? is there anything better for brevis?

June 17th, 2008, 05:58 PM	#3
Biel Bestue Regular Crew Join Date: Jul 2005 Posts: 96	Dennis i was thinking on getting a more bigger achromat (actually i don't know if they exist, i've havn't searched yet) since the midle is sharp, maybe i can have a bigger one and only use the middle, and then put a stepdown to 72 and use the cinevate spacer, do you think this can be achived that way? Last edited by Biel Bestue; June 18th, 2008 at 02:35 AM.

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June 16th, 2008, 09:45 PM	#2
Dennis Wood Major Player Join Date: Mar 2005 Location: Ontario, Canada Posts: 916	Yes, our optical flip array! The flip system transforms cameras like the XH-A1 into incredibly clean cameras and is certainly well regarded by our customers in terms of edge to edge sharpness too :-) Our video university series has a segment showing a test of the flipped Brevis with respect to CA...definitely some interesting results there.

June 19th, 2008, 07:39 PM	#4
Gints Klimanis Inner Circle Join Date: Jun 2003 Location: San Jose, CA Posts: 2,222	Would the Canon 77mm 500D or 250D work? I actually have a 500D sitting in my drawer and will try it the next time I use my RedRock M2, but given that it has a fixed focal distance of 500mm (50cm or about 20") , it will need too much distance from the ground glass. The 250D may work with the rails provided.