610mm De Golden Busch VS Schneider 550 XXL

[8x10 user]

Which is better for ULF? The Golden Busch seems like a more complicated plasmat design. Would it be sharper at larger apertures then the XXL? How about the differences in light fall off? ...Shouldn't the plasmat have more even illumination?

[aduncanson]

I can find little information on the 610 De Golden Busch, but the 550 Schneider XXL looks like a modification of the Dagor design. Schneider gives an angle of view of 78 deg at f/22 which is better than your typical plasmat will do. The 480mm WF De Golden Busch looks like a double Gauss design, like the Kodak Wide Field Ektar, which will cover as well or better than a Dagor. The 610 De Golden Busch is also described as a WF lens and so is probably a similar design. If so, it could have coverage for a 32x40 inch negative. For all of their adherents (and I am one) neither the double Gauss nor the Dagor will be as sharp as a modern plasmat derived design.

On the other hand, is ultimate sharpness really critical for your purpose? Are you going to make an 8x enlargement of your ULF negative and then evaluate its sharpness from a viewing distance of 10 inches?

[IanG]

You'd have to try both lenses to find out. But I think I'd rather trust Schneiders design criteria.

Ian

[8x10 user]

Are you sure it is a double Gauss design? It looks similar to a Sironar to me.

http://www.superlarge.com/deGoldenBusch/index.html

[sanking]

I am surprised to see that web site still active. Are these products still available?


Sandy King

Are you sure it is a double Gauss design? It looks similar to a Sironar to me.

http://www.superlarge.com/deGoldenBusch/index.html

[8x10 user]

I don't think they are available new. I did see a 19" Golden Busch sell on eBay for ~5k around a year ago.

[aduncanson]

Are you sure it is a double Gauss design? It looks similar to a Sironar to me.

http://www.superlarge.com/deGoldenBusch/index.html

That is the same image that I looked at, that made me think it was double Gauss. I am reading it that there are 4 elements with shading marks on their cross sections. The only way I can square that with Busch's claim of "7 elements" is if he counts the three air spaces. Which is not completely unprecedented.

[Eric Leppanen]

http://cgi.ebay.com/de-Golden-Busch-...QQcmdZViewItem

For what it's worth, the seller claims coverage of 20x24.

[8x10 user]

It looks like there are three strong reflections in the front and two in the back. Does that mean that it has 7 elements in 5 groups like the Apo-Sironar-W?

[Dave Wooten]

Melles Girot made the Golden Busch lenses, I think.