swmcl

14-Jul-2010, 18:20

Hello again,

I was ponderin' ...

In a lens series or family like say, Grandagons, Sironars or Super Angulon XLs etc. there is a certain formula. X number of elements in a certain arrangement. Surely it follows that there will be one or two focal lengths in the series that are best suited to the formula ?

The word on the street might be that the 150mm Sironar is the best Sironar. It would then follow that the Sironar lenses that are most different from the 150mm are the worst examples in the Sironar range no?!?

It depends on the formula obviously. For example, I would expect that the more you try to bend (refract) light the worse will be the result. So in Grandagons the Grandagon with the largest shutter opening and longest focal length might be the best for that series ... ?

I realise the manufacturer will try to make the lenses across the series perform similarly and I might be clutching at straws a bit here but my question still haunts me. Is there a best lens in a series and is that 'best' because of the formula - the glasses used, the curvature required etc. etc.

Cheers,

Steve

I was ponderin' ...

In a lens series or family like say, Grandagons, Sironars or Super Angulon XLs etc. there is a certain formula. X number of elements in a certain arrangement. Surely it follows that there will be one or two focal lengths in the series that are best suited to the formula ?

The word on the street might be that the 150mm Sironar is the best Sironar. It would then follow that the Sironar lenses that are most different from the 150mm are the worst examples in the Sironar range no?!?

It depends on the formula obviously. For example, I would expect that the more you try to bend (refract) light the worse will be the result. So in Grandagons the Grandagon with the largest shutter opening and longest focal length might be the best for that series ... ?

I realise the manufacturer will try to make the lenses across the series perform similarly and I might be clutching at straws a bit here but my question still haunts me. Is there a best lens in a series and is that 'best' because of the formula - the glasses used, the curvature required etc. etc.

Cheers,

Steve