TV 4" f5 Genesis v's TV 101

[Merlin66]

Can seems to find a reference which compares the original 4 element Genesis design to the lastest Petzel (?) designs. I think they are the same optical layout?

[Stephan]

Hi Merlin66

1988 it started with the TV 4" f5 Genesis with a Petzval design (optical).
1992 came the Genesis-sdf Pentzval design with a fluorite corrector lens
1995 the TV-101 was born
2001 came finally the NP-101 this time Al Nagler modifies the Petzval design
http://www.televue.com/engine/page.asp?ID=191

I have never seen one of those bad read a lot about them because at one stage I wanted to buy a Genesis-sdf.

To make a long story short, the NP-101 is the only true APO. The TV-101 is good for photography (with film) but visually not that well colour corrected. The Genesis-sdf is slightly worse especially visually. The older Genesis is rather pure corrected by today’s standard and can be compared to a F8 Achromatic lens.

Because of that I never bought the Genesis-sdf nor the TV-101 (and I can not afford the NP-101).

If you read between the lines of the tests you come to the same conclusion.

http://www.cloudynights.com/item.php?item_id=940

http://www.cloudynights.com/item.php?item_id=934

http://www.cloudynights.com/item.php?item_id=1141&pr=2x6x15

http://www.cloudynights.com/item.php?item_id=707&pr=2x6x15

http://www.cloudynights.com/item.php?item_id=970&pr=2x6x15