Ian Grant
Subscriber
Thank you for that info Ian. That aperture formula is massively helpful! A lens with waterhouse stops, and the associating slot, could be useful... I will be using most of the portraiture lenses I get for the Graflex at a fairly wide open aperture, so Im not sure if a projection lens with slots and stops is a deal breaker for me... It all depends on whats on the market, what I can find and what I can afford... So any suggestions or leads anyone can give for a fast Darlot Perzval that would be amazing!
Just to put things in perspective a UK seller has a projection Petzval like the one you linked to yesterday for under £150, it's 14" though so too long and a bit slow at f7.7. You should easily be able to find one in the UK in the £100-£150 price range with a slot for Waterhouse stops. MWClassic have them every so ofte, their site is down while they chage server today.
It's worth looking at how Ken Lee uses Tessars, they are nice wide open, a Cooke Triplet Series IIwould be nice for portraits as well. I have an 8" on my 5x4 Soho Reflex but I still need to fix the shutter. TTH Cooke sold the same lenses with soft focus devices but they are very sought after and fetch high prices, on the early ones essentially yo moved the front and rear cells slightly apart, you can do the same by unscrewing the front cell slightly.
Ian