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I've found you need to be patient with the penetrating oil (WD 40 in my case), when using Alex's method. Let it sit a a couple of days, then the hose clamp and hammer.

A late answer, perhaps: I'd say (from experience on an 11x14) that the no.1 will do a fine job. Once you get to 11x14, you're racking that lens a fair way out, so both angle of view and coverage are...

...but can anyone enlighten us all on the Perscheid triple?

Leo

My word, I think you nailed at least part of it it! That puts the Trioplan, Cassar, Eurgon (triplet) and Hypar in a distinct group. It may be these are all "soft" due to the inherent fallibility of...

Thanks a lot "Whir-Click"! I've seen the Hypars and Eurygons advertised this way. It's as though they're selling a "defect" of these designs as though it was a desirable quality (which for many, it...

Thanks Dan,

I knew about the Eurygons as they are visibly different (I assume those dinky little things are enlarger lenses?). The Stellor, however, is quite a surprise. You may have saved me some...

The following image is from a 300mm f/3.5 Goerz Hypar. I'm really enjoying this lens but it's got me thinking. As far as I know, the following are all of a similar design: the Steinheil Cassar, the...

Hi Randy. I hope you don't think I'm unhappy with the lens: not at all. I'm just trying to work out how to get it apart and back again.
I'm not bothered if it's Dallmeyer or Hugo Meyer!

All the...

"Benchmark"!!!! What a beautiful euphemism!

This is a rack and pinion lens but the brass is thicker than most I've seen. I don't have a serial number, unfortunately.

Thanks Steven. It's years I've been coming to this site and I've come to know your name very well. I'm very grateful you could point me in the right direction!

Leo

And here's a couple of images of the rear...

176651

176652

Hi everyone. I've broken down and cleaned up a few petzvals. I've re-laquered, re-cemented and hammered out a few dings. But, I am baffled by the Dallmeyer portrait petzval. In the images below I...

Just a quick note to anyone stumbling across this thread one day: those mysterious halos on my negatives were actually produced by the Paterson Orbital Colour Print Processor I use to develop my...

Thanks Doremus

I think your answer is very plausible. It would explain why the circles are so uniform - I'm glad you mentioned that you've seen something similar. I'm going to take more care in...

Thanks Doremus, that's some useful information. "Operator Error" is my middle name, so you might be right. I'm curious though: do you know from experience if film holder movement looks like this?
...

You know Joe, both those lenses do have shorter rear barrels than a regular plasmat - so it actually does hold water to an extent. But would reflections project such clearly defined circles? I'm...

You're telling me. I'd assumed a bellows leak would not be so defined. But there's a chance that a leak didn't show up on the other negs by chance... I'll try some tests.

Thanks for your interest!

Hi Andrew. Thanks for your reply. Yes the effect is similar but not identical. As I have absolutely no idea what a bellows leak looks like I wanted to see if anyone regonized this as one before I...

Hi all. I've recently shot two images on 8x10, wide open, utilising a coated 12 inch Dagor and a Fujinon L 300mm. On both shots there appears to be a halo with an even curve which stops at the...